All about dinosaurs, fossils and prehistoric animals by Everything Dinosaur team members.
//February
17 02, 2018

JurassicCollectables Highlights the Rebor “Raptors”

By | February 17th, 2018|Dinosaur Fans, Everything Dinosaur Products, Everything Dinosaur videos, Main Page, Photos of Everything Dinosaur Products|0 Comments

A Video Showcasing the Rebor “Raptors”

In response to popular demand, those highly talented people at JurassicCollectables have produced a video highlighting the range of “Raptors” that have been made by Rebor.  In this highly informative video, the narrator takes the viewer on a tour of the numerous dromaeosaurid models produced by Rebor.  This is a chronological tour, not in terms of the geological age of the fossils, but a timeline that lists the order in which these replicas were produced.  As JurassicCollectables are big fans of the movie franchise “Jurassic Park/Jurassic World”, the figures, most of which are very reminiscent of the Velociraptors seen in the films, the narrator is able to discuss some of his favourite pieces.

JurassicCollectables Reviews the Rebor Raptors to Date (Early 2018)

Video Credit: JurassicCollectables

A Timeline of Rebor “Raptors”

In this video review, which lasts a little over thirteen minutes, the first replica to be discussed is “Windhunter”, the Utahraptor figure (Utahraptor ostrommaysorum), which ironically is geologically much older than the Velociraptors depicted in the video.  The Rebor replicas have proved to be so popular, as not only are they excellent sculpts, but they remind collectors of the Velociraptors from the film franchise.  Some of the Rebor models pay tribute to Stanley “Stan” Winston, the American television and film special make-up effects creator responsible for the majority of the dinosaurs seen in the early “Jurassic Park” films.  This explains some of the names chosen by Rebor such as the baby Velociraptor figure “Stan” and the 1:18 scale cursorial replica “Winston”, which the narrator heralds as one of his personal favourites.

The Rebor 1:18 Scale Replica Velociraptor “Winston”

Rebor Velociraptor "Winston".

Rebor 1:18 scale Velociraptor model.

Picture Credit: Everything Dinosaur

Bronze Effects

It is not only the people behind the films that are honoured by this part of the Rebor range.  When the first film in the dinosaur-themed franchise came out, “Jurassic Park”, in 1993, a series of limited-edition bronze dinosaur models were cast.  Rebor produced their own limited-edition “Raptors” the bronze-effect “Father and Son” figures which were based on the “Winston and Stan” Velociraptor replicas.  In the video, the commentator points out the superb detailing on these figures and even highlights the areas on the models where the bronze-effect has been given a greenish tinge, to mimic the metal as it ages.

The Limited-edition Rebor “Father and Son” Velociraptor Replicas

Limited edition Rebor Velociraptors "Winston and Stan".

The Rebor replicas “Winston and Stan”.

Picture Credit: Everything Dinosaur

Only 1,000 of these model sets were produced, still, Rebor fans can view these figures in the JurassicCollectables video.  JurassicCollectables have done a good job in discussing the various Rebor models representing “Raptors” in chronological order, from the first to be produced to the latest such as “Gunn” and “Rose”, for completeness here is Everything Dinosaur’s list of Rebor dromaeosaurids from the first model to be produced to the very latest to come off the production line.

The List of Rebor Dromaeosaurids (First to Latest)

  • Rebor “Windhunter” Utahraptor ostrommaysorum
  • Rebor Club Selection Velociraptor Triplets (limited edition)
  • Rebor 1:6 scale Velociraptor Hatchlings
  • Rebor 1:35 scale baby Utahraptor “Breeze”
  • Rebor 1:18 scale baby Velociraptor “Stan”
  • Rebor Velociraptor “Winston”
  • Rebor “Father and Son” Velociraptor set (limited edition in bronze effect) – “Winston and Stan”
  • Rebor “Cerberus Clan” a trio of Deinonychus figures (D. antirrhopus)
  • Rebor 1:18 scale leaping Velociraptors “Spring-heeled Jack” and “Alex Delarge”
  • Rebor 1:18 scale Velociraptor “Pete”
  • Rebor 1:18 scale Velociraptors “Gunn” and “Rose”

To view the Rebor model range available from Everything Dinosaur: Rebor Prehistoric Animal Replicas and Figures

More Raptors to Come

Rebor has plans to add more dromaeosaurids to their model range.  Collectors will have the chance to add even more figures to their very own raptor pack.  As for personal favourites, we agree with the narrator in the JurassicCollectables video, “Winston” is very popular amongst Everything Dinosaur team members, but for the moment, this replica is just pipped by a nose by the excellent Velociraptor “Pete”.

The Rebor 1:18 Scale Velociraptor Figure “Pete”

Rebor "Pete" Velociraptor Model

A cursorial (running Velociraptor) called “Pete from Rebor.

Picture Credit: Everything Dinosaur

JurassicCollectables have produced video reviews of all the models seen in this very well made compilation video.  To view these videos, visit JurassicCollectables on YouTube.  Everything Dinosaur recommends that readers subscribe to the JurassicCollectables YouTube channel: JurassicCollectables on YouTube

16 02, 2018

Lizards Up on Two Feet in the Early Cretaceous

By | February 16th, 2018|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page, Photos/Pictures of Fossils|0 Comments

Lizards Sprinted to Safety to Avoid Predation

A team of international scientists writing in the journal “Scientific Reports”, have described the oldest lizard trackways known to science that record bipedal behaviour.  The little lizards lived around 110 million years ago, in what is now South Korea, it has been speculated that just like extant lizards, they took to their hind legs to avoid being eaten.  The mudstone slab preserves a total of twenty-nine prints, representing four trackways made by lizards.  The lizard trackways occur in the same horizon as the pterosaur ichnotaxon, Pteraichnus koreanensis, it has been speculated that these small animals were taking to their hind legs and sprinting away to avoid the attention of marauding flying reptiles.

A Lizard Escapes from a Pterosaur (Early Cretaceous of South Korea)

A lizard takes to its hind legs to avoid the attentions of a Pterosaur.

A lizard sprints away from an attacking Pterosaur (Pteraichnus koreanensis).

Picture Credit: Zhao Chuang

Rare Lizard Trace Fossils from the Hasandong Formation

The researchers from the Chinese Academy of Sciences, Seoul National University, the Korea Institute of Geoscience and Mineral Resources along with Anthony Fiorillo of the Perot Museum of Nature and Science (Dallas, Texas) studied the mudstone slab, which measures approximately seventy centimetres by thirty centimetres in size and identified the tiny tracks, as that of a basal member of the Iguania Infraorder of lizards.  The team came to this conclusion as living iguanians, such as those in the Basiliscus genus (basilisk lizards), have strong hind legs and are facultative bipeds, that is, capable of running on their back legs when the need arises.  The fossil record also shows that these types of lizards were present in Asia during the Early Cretaceous.

The Mudstone Slab with Trace Fossils and Accompanying Line Drawing

Fossilised lizard tracks and line drawing.

Photograph of the fossil slab with accompanying line drawing.

Picture Credit: Scientific Reports

The trace fossils were excavated from an old quarry adjacent to Hadong power station in Hadong County, in south-central South Korea.  It is believed that the strata in this area (Hasandong Formation) was laid down around 112 to 110  million years ago (Aptian/Albian faunal stages of the Early Cretaceous).  The well-preserved tracks have allowed the scientists to examine in detail the hand (manus) and foot (pes) anatomy of the ancient lizard.

When Did Lizards Develop Bipedal Capabilities?

Although, bipedal locomotion is known today and the Squamata (lizards and snakes), are the most specious of all the living reptile types, the fossil record for these creatures is particularly sparse.  Palaeontologists, remain uncertain as to when bipedal locomotion in lizards arose, although it has been inferred based on the relative proportions of front and hind limbs as seen in Tijubina pontei, an Early Cretaceous lizard, whose fossils are associated with the Crato Formation of Brazil.  The trackways discovered in South Korea suggest that bipedal locomotion in ancient lizards is deeply rooted in the phylogeny of lizard evolution.

Hand and Foot Tracks (Manus and Pes)

Hand and foot prints Sauripes hadongensis.

Manus and pes tracks of Sauripes hadongensis, (a) Enlarged photograph and drawing of a manus imprint (B1). (b) A pes imprint (A6).

Picture Credit: Scientific Reports

Sauripes hadongensis

The foot prints (pes) are plantigrade, indicating that this lizard walked on its toes and heels, just like us and all lizards today, as opposed to the digitigrade locomotion of the Dinosauria.  Although the individual prints are very small, around two centimetres in length, the five toes (pentadactyl), are clearly defined.  The lizard tracks appear in the same horizon as the pterosaur ichnotaxon Pteraichnus koreanensis and it has been speculated that the lizards could have been escaping from a flying reptile.  Behaving as a facultative biped, would also have elevated the head and this would have permitted the lizards to keep a better look out for aerial predators.

The scientists have estimated the ancient lizard’s body length by comparing the trackways to the extant lizard Tropidurus torquatus, a living member of the Infraorder Iguania.  The ichnotaxon has been named Sauripes hadongensis which translates as “lizard foot from Hadong County”.

An Illustration of the Bipedal Locomotion of the Ancient Lizard

An illustration of the running lizard (bipedal running).

An illustration showing the bipedal interpretation of the lizard trackway (SVL – snout to vent length and PL – pes length).

Picture Credit: Scientific Reports

The Palaeoenvironment of Lower Cretaceous South Korea

The mudstone strata has produced tridactyl (three-toed) dinosaur tracks as well as trace fossils representing the tracks of small pterosaurs.  Fossilised plants are also associated with these layers of rock.  It is suggested that the mudstone represents deposits from a swampy area or possibly the margins of a lake.   The Hasandong Formation has yielded numerous body fossils including several different types of vertebrate (turtles, pterosaurs, crocodilians and dinosaurs).  These fossilised bones are isolated, broken and highly fragmentary, indicating that they may have been exposed on the surface for some considerable time prior to subsequent burial.  They also may have been transported for some distance before deposition.  This taphonomy suggests that large rivers crossed this location, the mudstone slab may have been sited in an area away from a main river channel, that was subjected to periodic flooding by water with low energy, otherwise the delicate prints may not have been preserved.

Photographs of Individual Hind Foot Prints (Pes) with Digits Highlighted

Pes tracks of Sauripes hadongensis.

Photographs of the foot prints of Sauripes hadongensis with the digits highlighted.

Picture Credit: Scientific Reports

To read Everything Dinosaur’s 2014 article about the discovery of a tiny Theropod dinosaur from South Korea: Tiny Terror from South Korea

The scientific paper: “Lizards Ran Bipedally 110 Million Years Ago” by Hang-Jae Lee, Yuong-Nam Lee, Anthony R. Fiorillo and Junchang Lü published in Scientific Reports

15 02, 2018

Everything Dinosaur Wins Gold Trusted Service Award 2018

By | February 15th, 2018|Dinosaur Fans, Everything Dinosaur News and Updates, Main Page, Press Releases|0 Comments

Gold Trusted Service Award 2018

Everything Dinosaur has been awarded the Gold Trusted Service Award (2018) by FEEFO.  FEEFO is an independent global ratings company that operates worldwide.  Everything Dinosaur has partnered with FEEFO since the new company website went live around twelve months ago.  Over this period, we have been able to maintain very high customer ratings for our service and products, this has resulted in FEEFO recognising Everything Dinosaur’s efforts by awarding the most prestigious accolade of all.  When it comes to dinosaur toys, models and games, it looks like Everything Dinosaur’s service can’t be beaten.

Everything Dinosaur is Awarded FEEFO’s Highest Accolade – Gold Trusted Service Award

Everything Dinosaur wins top award.

FEEFO Gold Trusted Service Award (Everything Dinosaur).

Picture Credit: FEEFO

Top Marks for Customer Service

In an email sent by Andrew Mabbutt, the Chief Executive Officer of FEEFO, we were informed that we had achieved the highest grade of customer service and as a result, Everything Dinosaur had been recognised with the awarding of this prestigious accolade.  To be afforded the honour of Gold Standard, a company has to maintain an average service score of 4.5 out of 5 over a sustained period.  Everything Dinosaur has a 5 out 5 (100%) customer service rating.

Gold Trusted Service Award from FEEFO

Everything Dinosaur awarded Gold Trusted Service accolade.

FEEFO Gold Trusted Service Award.

Picture Credit: FEEFO

Collecting Reviews

Collecting feedback and reviews  from customers is a powerful way of engaging with Everything Dinosaur’s customer base.  It helps Everything Dinosaur to maintain trust and to have a bigger on-line presence.  Real customers providing real feedback about our products and customer service.

A spokesperson for the UK-based dinosaur company stated:

“We are delighted to have been awarded the highly respected Gold Trusted Service accolade from such a reputable company as FEEFO.  We feel very honoured and would like to take this opportunity to thank all our customers who have taken the time and trouble to provide feedback to FEEFO.”

Over 1,500 Customer Comments

Since Everything Dinosaur partnered with FEEFO twelve months ago, the company has received around 1, 500 customer reviews and comments.  In the first six weeks of 2018, Everything Dinosaur has received nearly 100 customer feedback reports and the company’s service rating has been maintained at 100% (five out of five stars).

Our thanks once again to all our customers and dinosaur fans who have taken the time and trouble to provide feedback about our products and customer service.

To view the range of dinosaur and prehistoric animal themed toys, games and models available from Everything Dinosaur: Visit Everything Dinosaur

14 02, 2018

The Very First Edition of “Prehistoric Times”

By | February 14th, 2018|Dinosaur Fans, Magazine Reviews, Main Page, Movie Reviews and Movie News, Photos, Prehistoric Times|0 Comments

“Prehistoric Times” First Edition

Two years ago, Everything Dinosaur was informed that Aardman Animations, the company behind such iconic characters as Wallace & Gromit, Shaun the Sheep and films such as “Arthur Christmas”, had approached our chum Mike Fredericks, the editor of the quarterly magazine “Prehistoric Times” to request permission to utilise his magazine in a forthcoming movie.  The film entitled “Early Man” was premiered in the UK last month and is due to be released in the United States later this week.

A Still from the Animated Film “Early Man” Showing the Prehistoric Times

The first edition of "Prehistoric Times".

An early subscriber to “Prehistoric Times”.

Picture Credit: © 2018 Studiocanal S.A.S. and The British Film Institute

“Prehistoric Times”

Everything Dinosaur contacted Aardman Animations and they very kindly agreed to release a still from the movie, showing one of the lead characters, Lord Nooth, the greedy leader of the Bronze Age folk, voiced by British actor Tom Hiddleston, perusing an edition of “The Prehistoric Times”.

The modern version of “Prehistoric Times” (an unintended oxymoron), is a quarterly publication which has been in circulation for more than a decade, but clearly the magazine was popular much earlier.  From this evidence, it seems that this magazine has been in vogue since the New Stone Age.

For further information about “Prehistoric Times” – the quarterly, not the scroll version: Prehistoric Times Magazine

You can even read it in the bath should you wish to do so, although the prehistoric Wild Boar is optional.

13 02, 2018

Spot the Woolly Mammoth Model

By | February 13th, 2018|Dinosaur Fans, Main Page, Photos|0 Comments

Which Woolly Mammoth Model is This?

The successful British television detective drama “Endeavour” has begun its fifth season and one of the episodes of this prequel to the long-running series “Morse”, featured a story involving a film company called “Mammoth Pictures Studios”, which had made a horror movie about an Egyptian Pharaoh and a curse.  The emblem of the Studio, shown in the first few moments of the programme, which was entitled “Cartouche”, caught our eye, as it featured a model of a Woolly Mammoth (Mammuthus primigenius).

The Fictional Woolly Mammoth Emblem from the Television Programme

A Woolly Mammoth model on the television.

The emblem of the fictional film company Mammoth Pictures Studios.

Picture Credit: Mammoth Screen and Masterpiece

Which Woolly Mammoth replica was this?

Identifying the Woolly Mammoth Model

The selection of the fictional film company’s name was no accident, “Endeavour” is produced by two organisations “Mammoth Screen” and “Masterpiece”, the choice of an iconic Pleistocene animal as the Studio’s logo was a clever pun on the name of one of the co-production companies.  As the model revolved around on its simulated block of ice, we wondered how many model and figure collectors would have recognised the replica.  It was tricky, the Woolly Mammoth was only on screen for a few seconds and it was shot from angle that gave the impression that the model was far larger than it actually was.   When the camera is held low in relation to an object in shot and the viewer is given the impression of looking up at the object, then the object in question can look far more imposing and substantial than it actually is.

Trying to Identify the Woolly Mammoth Figure

Woolly Mammoth model on television.

The Woolly Mammoth figure from the television series.

Picture Credit: Mammoth Screen and Masterpiece

The clever use of photography made the identification task quite difficult.  The model looks to have received a make-over in terms of its paint job, which also complicated recognition, after all, this is a detective television programme so working out the model was not going to be easy.  However, as the Mammoth rotated on its plinth it was suggested that this was a Carnegie Collectibles 1:30 scale Woolly Mammoth replica, one that had been retired and out of production.

Is This the Woolly Mammoth from “Endeavour”?

Carnegie Woolly Mammoth model.

A model of a Woolly Mammoth.

Picture Credit: Everything Dinosaur

This Woolly Mammoth model was manufactured by Safari Ltd but was retired, along with the entire Carnegie Collectibles range in 2015.  It is quite a rare figure, one that is difficult to obtain.  Sadly, we at Everything Dinosaur sold out of this particular figure, some months ago.

Ice Age Icon – Woolly Mammoth

Woolly Mammoth figure seen on televison.

The Woolly Mammoth model seen on the television programme.

Picture Credit: Mammoth Screen and Masterpiece

Solving a Mystery

At the very beginning of a detective drama, we had our own little mystery to solve.  Have we detected correctly?  Perhaps we need the observational skills and quick mind of the eponymous police office upon whom this television series is based.

12 02, 2018

Stepping into the Lower Cretaceous of Maryland

By | February 12th, 2018|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page, Photos/Pictures of Fossils|0 Comments

Diverse Footprint Assemblage Reveals Early Cretaceous Biota

Back in 2012, Everything Dinosaur reported upon the discovery of a partial nodosaurid footprint found at NASA’s Goddard Space Flight Centre in Greenbelt, Maryland (USA).  Subsequent excavations have revealed a diverse trace fossil assemblage, preserving footprints of dinosaurs, mammals and flying reptiles (Pterosauria) located in a single slab of sandstone.  This remarkable fossil records a snapshot in deep geological time and shows how different types of animals interacted in a wetland environment.

A View of the Cast of the Actual Fossil that Records the Entire Track Bearing Surface

Goddard Space Centre (NASA) trackways.

The cast of the track bearing surface reveals over 70 trace fossils.

Picture Credit: Scientific Reports

Co-corresponding author of the scientific paper, published in the journal “Scientific Reports”, Ray Stanford (NASA, Goddard Space Flight Centre), the scientist who first discovered trace fossil evidence at the Goddard site, commented:

“It’s a time machine.  We can look across a few days of activity of these animals and we can picture it.  We see the interaction of how they pass in relation to each other.  This enables us to look deeply into ancient times on Earth.  It’s just tremendously exciting.”

Natural Impressions

The single slab of iron-rich sandstone measures over two metres in length and the cast of the fossil (see above), represents at least eight different track types denoting dinosaurs, crocodilians, pterosaurs and mammals.  All the tracks are preserved as natural impressions (concave epireliefs) and at least twenty-six mammalian tracks have been identified.  Analysis of the fossil material suggests that all the impressions were made within a relatively short time of each other, the fossil (GSFC-VP1) can be interpreted as snapshot recording the activities of a diverse biota around a wetland area during the Early Cretaceous (Albian/Aptian faunal stages).

A Schematic Showing the Extant of the Trace and Body Fossils Preserved

Trackways represent a diverse biota.

Goddard Space Flight Centre (NASA) tracks – schematic drawing.

Picture Credit: Scientific Reports with additional annotations by Everything Dinosaur

Tracking the Dinosaurs

The track that first highlighted the potential of the site “the discovery track”, which is coloured light brown in the drawing above, and situated in the north-eastern corner of the sandstone slab, has been identified as a nodosaurid print.  This single print measures around 29 centimetres in diameter.  The posterior (heel) region is obscured by a smaller track of uncertain providence.  The small track could represent a print made by a juvenile Nodosaur.  If this is the case, then this section of the fossil could show the tracks made by an adult and juvenile armoured dinosaur as they walked together (see silhouettes adjacent to the track illustration).

A single, black object with a raised ridge is also preserved.  This has been interpreted as an individual scute from a nodosaurid.  Measuring five centimetres across, the fossil is surrounded by a polygonal pattern consistent with the surrounding integument associated with nodosaurid skin impressions.  The unique taphonomy of the Patuxent Formation that is exposed at the Goddard Space Flight Centre and other locations in Maryland has already provided palaeontologists with the beautifully-preserved impression of the rear half of an articulated baby nodosaurid.  This dinosaur was named Propanoplosaurus marylandicus by Stanford et al in 2011.

The Object Identified as a Nodosaurid Scute (Dermal Armour)

Potential Nodosaurid Scute

(A) photograph of nodosaurid scute and associated polygonal pattern of surrounding integument, (B) simplified outline of polygonal pattern.

Picture Credit: Scientific Reports

The large nodosaurid print along with the track made by the left front foot of a Sauropod (see single print outlined in light purple and the silhouette on the schematic), confirms the presence of large dinosaurs in the area.

Small Theropod Dinosaurs Systematically Searching for Food

Four parallel trackway patterns made by crow-sized Theropod dinosaurs have been identified.  The outermost tracks of the group have been labelled in the schematic T1 and T4.  This parallel pattern and the short distance between individual footprints suggest that these small meat-eaters were moving slowly and working together to systematically comb the area for food.

Martin Lockley (University of Colorado, Denver) and co-corresponding author with Ray Stanford explained:

“It looks as if they were making a sweep across the area.”

Theropod Trackways T1 and T4 Illustrated

Theropod tracks.

Goddard Space Flight Centre (Theropod tracks).

Picture Credit: Scientific Reports

The picture above shows drawings of various Theropod tracks,  T1 consists of six footprints, whilst T4 is comprised of five individual prints (diagrams A and B).  The short stride length indicates very short steps, consistent with the idea that these little meat-eating dinosaurs were carefully scrutinising the area, probably hunting for food.  Diagrams C and D represent isolated tracks with toe digits widely separated (divarication) – note the scale bar = 20 cm.

Marvellous Mammalian Tracks

The dinosaur tracks might first catch the eye, but the real stars of this Early Cretaceous “dance floor” are the collection of mammalian prints.  At least twenty-six mammal tracks have been identified.  The largest print, covering around twenty-five square centimetres is the largest mammal footprint ever discovered from the Cretaceous.  This suggests that there were plenty of mammals about and some of them were quite big, about the size of a Highland terrier or a raccoon.

The researchers conclude that most of the mammalian prints represent small squirrel-sized animals and the study has resulted in the erection of a new ichnotaxon Sederipes goddardensis.  The genus name roughly translates from the Latin as “sitting foot” as some of these impressions indicate that the small mammals sat up in a similar way to extant prairie dogs.  The trivial name honours the Goddard Space Flight Centre.

Mammal Tracks as Identified on the GSFC-VP1 Specimen

Examples of mammal tracks.

Early Cretaceous mammal tracks (GSFC-VP1).

Picture Credit: Scientific Reports

The photograph (above), shows examples of the diverse mammal tracks.  Tracks m1-m4 include the holotype ichnofossils of the new ichnotaxon Sederipes goddardensis.  Note scale bar and (J) which denotes a large, five-toed track with an image of a similar track described in 2007.

The authors believe the wide diversity and number of tracks show many of the animals were in the area actively feeding at the same time.  It has been proposed that the mammals may have been feeding on worms and grubs, the small carnivorous Theropods were after the mammals, and the pterosaur tracks found in situ could suggest that flying reptiles were hunting in the vicinity too, perhaps after both the mammals and their reptile contemporaries.

The scientific paper: “A Diverse Mammal-dominated, Footprint Assemblage from Wetland Deposits in the Lower Cretaceous of Maryland” by Ray Stanford, Martin G. Lockley, Compton Tucker, Stephen Godfrey and Sheila M. Stanford published in Scientific Reports.

To read Everything Dinosaur’s 2012 article about the initial footprint discovery: Space Age Meets Dinosaur Age

Photograph of the Cast and Schematic Drawing

Schematic drawing and fossil cast (GSFC-VP1)

GSFC-VP1 cast and schematic drawing.

Picture Credit: Scientific Reports

11 02, 2018

Magma Outflow from Mid-Ocean Ridges Contributed to Dinosaur Demise

By | February 11th, 2018|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Geology, Main Page|0 Comments

Magma Outpourings Along Oceanic Boundaries of Tectonic Plates

Scientists have concluded that magma outpourings along the edges of tectonic plates in the deep ocean may have contributed to the mass extinction event that marked the end of the Mesozoic, some sixty-six million years ago.

Researchers from the University of Oregon, in collaboration with colleagues from the University of Minnesota, identified gravity-related fluctuations dating to around the time of the end Cretaceous along ocean ridges that point to the worldwide release of volcanic magma.   The outpouring of molten rock could have contributed to the global climatic catastrophe that marked the extinction of about 70% of all terrestrial lifeforms including the dinosaurs and their flying reptile cousins (Pterosauria).

The Extra-terrestrial Impact Event Could Have Exacerbated Volcanism Including Along Oceanic Ridges

Magma flows along ocean ridges.

Increased outpourings of magma along ancient ocean ridges could have contributed to the end Cretaceous extinction event.

Picture Credit: University of Oregon/E. Paul Oberlander, Woods Hole Oceanographic Institution, Graphic Services

Lead author of the scientific paper, published in the academic journal “Science Advances” Joseph Byrnes, (Department of Earth Sciences, University of Minnesota), stated:

“We found evidence for a previously unknown period of globally heighted volcanic activity during the mass-extinction event.”

A “One-Two” Knockout Blow

The team’s analysis of the strength of gravity along these ancient ocean ridges, points to a pulse of accelerated global volcanism that along with the massive outpourings known as the Deccan Traps of India would have significantly impacted upon the planet’s climate.  How much the enormous Deccan Traps contributed to the demise of the Dinosauria has been debated for decades.  Huge volcanic events, fortunately quite rare, such as the outpourings of molten rock that at some places in India, are more than two kilometres thick and cover much of the western portion of the sub-continent, can have a colossal effect on the Earth’s climate.  When these events do occur, they are very often linked to global mass extinctions.  The expulsion of gas and ash into the air can block out the sun causing plants to die and ecosystems to collapse.  Acid rain is also associated with the release of sulphur dioxide into the atmosphere from volcanoes.

With the discovery of the Chicxulub impact crater on the Yucatan Peninsula (Mexico), scientists have debated how much of an effect the Deccan Traps eruptions did have.  Seismic data suggests that part of India was already active when the extra-terrestrial body hit the Earth around 66 million years ago, however, the impact was so massive, the resulting seismic shock waves moved through the Earth’s crust and probably led to an acceleration of those eruptions.

Co-author, Leif Karlstrom added:

“Our work suggests a connection between these exceedingly rare and catastrophic events, distributed over the entire planet.  The meteorite’s impact may have influenced volcanic eruptions that were already going on, making for a one-two punch.”

The idea that the impact event increased volcanism gained credence in 2015 following research from scientists based that the University of California, Berkeley.  They proposed that powerful seismic waves could have exacerbated distant volcanic eruptions, making the Deccan Traps even more active.

Mapping Gravity Anomalies in Mid-Ocean Late Cretaceous Environments

Mapping gravity anomolies.

Coloured and black lines mark mid-ocean ridges 66 million years ago and reflect seafloor spreading rates and gravity anomalies after the impact event.

Picture Credit: Joseph Byrnes

This new research extends this exacerbated eruption idea to oceanic basins worldwide.  To conduct the research, a geological map of the seafloor was divided into equally sized sections and the history of the ocean basins plotted back in time for more than 100 million years.  At around 66 million years ago, the approximate time of the Chicxulub impact event, evidence for a “short-lived pulse of marine magmatism”, along the ancient ocean ridges where tectonic plates meet was found.  This pulse is indicated by a spike in the rate of the occurrence of free-air gravity anomalies found in the data.  Free-air gravity anomalies, measured in tiny increments (milligals), account for variations in gravitational acceleration, found from satellite measurements of additional seawater collecting where the Earth’s gravity is stronger.  Byrnes found changes in free-air gravity anomalies of between five and twenty milligals associated with seafloor created in the first million years after the impact event.

The scientific paper: “Anomalous K-Pg–aged Seafloor Attributed to Impact-induced Mid-Ocean Ridge Magmatism” by Joseph S. Byrnes and Leif Karlstrom published in the journal “Science Advances”

10 02, 2018

Polar Hypsilophodonts in the Spotlight

By | February 10th, 2018|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page|0 Comments

New Study Looks at the Growth Rates of Polar Hypsilophodonts

Researchers from Museums Victoria (Melbourne, Australia) and the Oklahoma State University Centre for Health Studies, have published a new paper in the academic journal “Scientific Reports” that examines the growth rates of polar dinosaurs, specifically the growth rates of those fleet-footed Ornithischians the hypsilophodontids.  Palaeontologists have long-debated whether these small dinosaurs, which were geographically widespread during the Early Cretaceous, showed different growth rates between high latitude forms and those that lived closer to the Equator.

An Illustration of a Typical Hypsilophodont Dinosaur

Hypsilophodont.

A typical hypsilophodontid dinosaur.

Picture Credit: Everything Dinosaur

The Perils of Being a “Polar” Dinosaur

Dinosaurs that lived in high latitude habitats such as those that lived on the southernmost portions of Gondwana, had to endure low temperatures, plus periods of prolonged darkness as the sun dropped below the horizon.  Although, nowhere near is as cold as the Antarctic today, close to the South Pole in the Early Cretaceous was quite a foreboding, formidable environment.  However, several types of non-avian dinosaurs, including several hypsilophodonts seem to have flourished.  Four taxa have been described to date, from two principle locations namely:

  • Fulgurotherium australe from the Flat Rocks and Dinosaur Cove locations (Victoria)
  • Qantassaurus intrepidus (Flat Rocks location)
  • Leaellynasaura amicagraphica from Dinosaur Cove
  • Atlascopcosaurus loadsi (Dinosaur Cove)

As all these genera are named from fragmentary remains (elements from the jaw and individual teeth), with the exception of L. amicagraphica, which is known from more substantial material, in the absence of more fossil remains some of these taxa are regarded as nomen dubia.

The microstructure of limb bones (femora and tibias) were analysed to identify growth trends, the study revealed that there were probably two genera present in those fossils studied which had come from Dinosaur Cove.  Bone microstructure alone, could not distinguish taxa within the sample of bones from the Flat Rocks area.  The researchers, which included Dr Thomas Rich and his partner Dr Patricia Vickers-Rich conclude that further histological study of hypsilophodont material from these sites may help to confirm the number of genera present as well as to help improve the data on polar dinosaur growth rates.  Leaellynasaura was named in honour of the couple’s daughter Leaellyn Rich.

Several Species Likely

Flat Rocks and the Dinosaur Cove locations are separated by Port Phillip Bay, they are approximately 120 miles (200 kilometres) apart.  These areas are also distant from a geological perspective, with the Flat Rocks locality being made up of sedimentary rocks that date from around 133 – 128 million years ago (Late Valanginian or Barremian faunal stages of the Early Cretaceous).  Whereas, the rocks that formed Dinosaur Cove on the other side of Cape Otway, are much younger, being laid down approximately 106 million years ago (Albian faunal stage of the Early Cretaceous).  Based on the temporal range that these fossils represent, then it is quite likely that these dinosaur fossils from the coast of Victoria do, indeed, represent several genera.

Growth Rates Amongst Polar Hypsilophodonts

The research into the bone microstructure of the limb bones of these types of polar dinosaur reveals that both the Flat Rocks and Dinosaur Cove specimens were growing in a similar way, at a similar rate to many typical small-bodied vertebrates.  These animals tended to have lower annual growth rates when compared to larger vertebrates.  The palaeontologists note that the large (eight metres long), Ornithischian Maiasaura from the Late Cretaceous of the United States took around eight years to reach adult size, whereas one of the specimens in the study seems to have reached maturity a year earlier, but it was a much smaller-bodied dinosaur, only growing at a fraction of the rate of the larger Maiasaura.

Transverse Sections from the Femur of a Hypsilophodont Used in the Study

Bone microstructure and histology in hypsilophodont limb bones.

Images of a cross-section of a hypsilophodont right femur showing histology and bone microstructure.

Picture Credit: Scientific Reports

The researchers did note that although the polar hypsilophodontids grew quite slowly compared to their larger relatives, the bone histology studies revealed that they had a relatively elevated growth rate for the first few years of their life.  Growing up relatively quickly, or at least reaching a certain threshold body size could have been an evolutionary response to avoid predation.

The paper published in “Scientific Reports”, is the first study of its kind into the growth rates of Australian polar hypsilophodonts.  The team conclude that these dinosaurs might have reached maturity in about five to seven years.  As adults, these genera only rarely exceeded lengths of 2.8 metres, most of which was tail and individual body mass for most of these dinosaurs was under fifty kilograms.

The research could be extended to include an analysis of hypsilophodontid limb bones excavated from lower latitudes.  A more complete comparison between the ontogeny of hypsilophodonts from different parts of the world could then be made.

9 02, 2018

Out of Africa – Much Earlier Than Expected

By | February 9th, 2018|Dinosaur and Prehistoric Animal News Stories, Main Page, Photos/Pictures of Fossils|0 Comments

Human Jawbone Fossil Rewrites our History

The discovery of a fossilised upper jawbone, complete with teeth, has rewritten the history of our own species and supports the theory as proposed by genetic studies that H. sapiens migrated out of Africa much earlier than previously thought.  Most palaeoanthropologists contend that our species Homo sapiens originated in Africa and then at some point in the distant past migrated out of Africa spreading into the Middle East, Asia and Europe before colonising the rest of the world.  Human fossils found outside Africa have been dated to 120,000 to 90,000 years ago (Tarantian faunal stage of the Late Pleistocene), the discovery of a human jawbone fossil at Misliya Cave on the western slopes of Mount Carmel, Israel, demonstrates that modern humans were already present in northern Israel at least 55,000 years earlier.

The Fossil Jawbone that Reinforces the Idea that Modern Humans Migrated Out of Africa Much Earlier

Modern human jawbone fossil.

The left maxilla from a modern human found in northern Israel.

Picture Credit:  Israel Hershkovitz Tel Aviv University

Levallois Technology

The international team of scientists, including  Israel Hershkovitz (Tel Aviv University) and Rolf Quam from the Department of Anthropology at Binghamton University, examined the sediments in the cave associated with the human jawbone fossil find.  There has been a research project associated with the Misliya Cave site for several years.  This new research builds upon previous studies and it supports the idea that the people at this location were making and using a range of sophisticated stone tools reminiscent of the tools associated with the earliest modern humans in Africa (Levallois technology).  The sediments reveal a series of well-defined hearths as well as numerous animal remains and stone tools.  An analysis of the human remains, dating the sediments and the fossil itself, suggests an approximate age range of between 177,000 and 194,000 years old, making this jawbone the oldest member of the Homo sapiens species to have been found outside of Africa.

The research team conclude, that the fossil, known as the “Misliya maxilla” along with the abundant stone tools, indicates that the emergence of this technology is linked to the appearance of our species in this region of the Middle East.

For an article that summarises research from 2016 that questions the relatively late migration of modern humans out of Africa: Out of Africa Earlier than Thought?

Another 2016 article that looks at the evidence in support of a theory that suggests modern humans evolved independently in Asia: Did Humans Evolve Independently in Asia?

8 02, 2018

Dinosaurs Reveal the Geographical Signature of an Evolutionary Radiation (Part 2)

By | February 8th, 2018|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page|0 Comments

Dinosaurs Reveal the Geographical Signature of an Evolutionary Radiation

Yesterday, Everything Dinosaur posted an article on the newly published scientific paper that examined how the Dinosauria radiated out from their suspected South American origins and came to dominate terrestrial ecosystems around the world.  The research was conducted by scientists based at Reading University and their paper was published this week in the academic journal “Nature Ecology & Evolution”.

To read our article on this research: The Evolutionary Radiation of the Dinosauria Mapped

Building upon earlier research, the Reading University scientists believe that the dinosaurs were already in decline before the final coup de grâce that marked the end of the Cretaceous and the demise of the non-avian dinosaurs.  The dinosaurs spread across the planet, but they began to run out of space to migrate into, becoming victims of their own success.

Everything Dinosaur has received special permission from the University to publish some of the images created by the researchers that plot the routes taken by various dinosaur species as they spread across the world.  The pictures (below), show six reconstructed paths from the dinosaurian root node (black circle) to the fossilised species (black square).  The coloured circles represent the centroids of the reconstructed ancestral locations (these are used for visualisation purposes only and posterior distributions of estimated ancestral locations are used in all analyses).  These maps help to demonstrate the conclusions drawn by the researchers.  Take for example, the first image, that of the path of Rhoetosaurus (R. brownei).  R. brownei was a Sauropod, its fossils are found in eastern Australia and it lived some 170 million years ago.

The Evolutionary Path of Rhoetosaurus brownei

Picture Credit: University of Reading (silhouette credit: Remes K, Ortega F, Fierro I, Joger U, Kosma R et al, silhouette represents Spinophorosaurus nigerensis)

The Evolutionary Path of Archaeopteryx lithographica is Plotted

Plotting the evolutionary path of Archaeopteryx lithographica.

The evolutionary path of Archaeopteryx lithographica.

Picture Credit: University of Reading (silhouette credit: Scott Hartman)

Archaeopteryx lithographica lived around 150 million years ago, its fossils have been found in the limestone quarries of southern Germany.  All the evolutionary paths that have been created by the researchers have been plotted onto geological age level palaeomaps from the time at which the fossil species is dated to (grey).  All preceding age level palaeomaps are plotted in white.

Plotting the Path of the Ornithischian Dinosaur Stegosaurus stenops

Plotting the evolutionary path of the armoured dinosaur Stegosaurus stenops.

Plotting the evolutionary path of Stegosaurus stenops.

Picture Credit: University of Reading (silhouette credit: Scott Hartman)

Like Archaeopteryx, Stegosaurus stenops fossils are associated with Upper Jurassic strata.  However, this research suggests that unlike the Archaeopteryx lineage, which migrated into eastern Laurasia, the evolutionary path of S. stenops was oriented towards western Laurasia, fossils of this iconic armoured Ornithischian being associated with the Morrison Formation of the western United States.

The Evolutionary Path of Andesaurus delgadoi is Plotted

The evolutionary path of Andesaurus delgadoi is plotted.

Plotting the path of the Titanosaur Andesaurus delgadoi.

Picture Credit: University of Reading (silhouette credit: T. Tischler, the silhouette represents the related titanosaurid Wintonotitan wattsi)

Late Cretaceous Migrations

The titanosaurid A. delgadoi lived some 97 million years ago (Cenomanian faunal stage of the Late Cretaceous).  Note how the world map has changed in the illustrations, reflecting the change in the position of the continents.  The known fossil evidence suggests that the majority of the titanosaurids were restricted to Gondwana for most of the Cretaceous species.  Only in the very Late Cretaceous did a land bridge form, permitting these dinosaurs to migrate into North America.

Path of Dromaeosaurus albertensis 

Plotting the path of Dromaeosaurus albertensis .

The path of D. albertensis, dromaeosaurs migrated into North America from high latitudes.

Picture Credit: University of Reading (silhouette represents Dromaeosauroides bornholmensis known from Upper Cretaceous rocks from Denmark)

The researchers conclude that the dromaeosaurids associated with North America crossed over from northern Asia.

Last but not least, no evolutionary study mapping the spread of the dinosaurs would be complete without reference being made to the Tyrannosauroidea.  The map below, shows the path plotted for Tyrannosaurus rex.

Plotting the Path for T. rex

Plotting the evolutionary path of Tyrannosaurus rex.

T. rex evolutionary path is plotted.

Picture Credit: University of Reading

From their South America origins, this most famous of the Theropoda seems to have traversed Laurasia before heading westwards to become the dominant, apex predators in the Late Cretaceous (Laramidia and (most likely) Appalachia).

The authors of the scientific paper state that all silhouettes were downloaded from www.phylopicdotorg.

The scientific paper: “Dinosaurs Reveal the Geographical Signature of an Evolutionary Radiation” by Ciara O’Donovan, Andrew Meade and Chris Venditti published in Nature Ecology & Evolution.

Everything Dinosaur acknowledges the help of Reading University in the compilation of this article.

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