All about dinosaurs, fossils and prehistoric animals by Everything Dinosaur team members.
15 05, 2019

New Technology and Fossil Hunting on Mars?

By | May 15th, 2019|Geology, Main Page, Palaeontological articles, Photos/Pictures of Fossils|0 Comments

Fossil Hunting on Mars – Where to Look?

The second stage of the joint European and Russian ExoMars project is due to launch in 2020.  The first part of the mission involved an atmospheric probe designed to search for trace amounts of methane and other gases in the thin Martian atmosphere – evidence of there having been life on the planet in the past.  The results so far have been a little disappointing but, part two will continue the main aim of this programme, addressing the question as to whether or not we are alone in the universe.

A rover will explore the surface and crucially, it will collect samples with a drill down to a depth of two metres and analyse them onboard using sophisticated instrumentation.  Samples from beneath the surface of Mars are more likely to include biomarkers, as the thin atmosphere provides little protection from radiation and photochemistry, but could ExoMars be looking for evidence of life in the wrong place?

An Artist’s View of the ExoMars Rover on the Martian Surface

ExoMars Rover (2020)
Set to launch in 2020 the ExoMars expedition will include a sophisticated rover that will drill into the soil to test for past life.

Picture credit: European Space Agency (ESA)

An Atlas of Volcanic Rock – On the Hunt for Extremophiles

Researchers at the Swedish Museum of Natural History (Stockholm),  have begun compiling an atlas of fossils in volcanic rock, to guide where and what to look for in the search for Martian life.  Most fossils are associated with sedimentary rocks and there are sedimentary rocks on the red planet (deposits formed in layers), either through the transport of material via water, with the assumption that in the ancient past, liquid water existed on the Martian surface, or via wind (aeolian) deposition.

However, igneous rocks dominate the geology of Mars and writing in the academic journal “Frontiers in Earth Science”, the scientists suggest that it is these igneous rocks that may harbour evidence of life.  Producing a guide to the microbial fossils found in volcanic rocks on Earth, can then assist the Mars exploration team in identifying suitable sites to hunt for Martian microbial fossils.

An Environmental Scanning Electron Microscope Image of Fossilised Fungi

Fossil fungal mycelium.
ESEM image of a fossil fungal mycelium with associated “cauliflower-like” microstromatolite formed by iron-oxidizing bacteria. From Koko Seamount, Pacific Ocean, 43 million years old.

Picture credit: Frontiers Press

Lead author of the paper, Dr Magnus Ivarsson explained:

“We propose a “volcanic microfossil atlas” to help select target sites for missions seeking evidence of extraterrestrial life, such as the NASA Mars mission 2020 and ExoMars.  The atlas could also help us to recognise what Mars microfossils might look like, by identifying biosignatures associated with different types of fossilised microbes.”

Microfossils Buried in Deep Rock and in Deep Geological Time

Dr Ivarsson and his colleagues study life buried in deep rock and deep geological time.  Looking for the fossilised remains of ancient microbes, that have lived up to one thousand metres below the deepest ocean floors and may have originated more than 3.5 billion years ago.

The Martian Surface But Could the Subsurface Harbour Evidence of Ancient Life?

The surface of Mars.
Evidence of ancient life such as microfossils could be preserved beneath the surface of Mars.

Picture credit: Frontiers Press

Dr Ivarsson added:

“The majority of the microorganisms on Earth are believed to exist in the deep biosphere of the ocean and continental crust.  Yet we are just now beginning to explore, through deep drilling projects, this hidden biosphere.”

In a saline, water world of extreme pressure, that is in perpetual darkness, fungi, bacteria and other microbes have adapted to feed on the igneous rock that surrounds them.  There are even predator/prey relationships.  These organisms spread through microscopic fractures and cavities forming complex ecosystems.  When these lifeforms die, they can become microfossils, providing a history of their existence.

Fossilised Fungal Mycelia

Fossilised fungal mycelia in a subseafloor basalt.
An image by optical microscopy of an open vesicle in subseafloor basalt from Koko Seamount.  Fossilised fungal mycelia protrude from the vesicle wall, yellow and brownish microstromatolites grow on the hyphae and large calcite crystal occur in the middle of the vesicle.

Picture credit: Frontiers Press

An Atlas of Microfossils from Igneous Rocks

Scientists are aware that the rocky planets Mars and Earth are very similar geochemically, so by looking at igneous rocks on Earth, this should help guide the search for life on Mars.

Ivarsson explained:

“Our aim is to be able to use the oceanic crust microfossil record as a model system to guide Martian exploration.  Our review of existing knowledge is an important first step, but a more comprehensive understanding of the deep life is needed to show where and what to search for.”

The microfossil atlas would also help to determine which samples should be targeted for return to Earth for further analysis, given the limited payload of the Mars missions.  Perhaps, within two years of this article having been written, we will know the answer to the question about whether or not we are alone in this universe, that there was once, perhaps there still is, microbial life deep underground on Mars.

Could Evidence of  Ancient Life on Mars be Discovered within the Next Two Years?

Synchrotron-based X-ray tomography - an image of fungi and prokaryotic cell-like structures.
Three-dimensional reconstruction made by synchrotron-based X-ray tomography (srxtm).  Fungal mycelium with microstromatolitic structures and remains of prokaryotic cell-like structures in between the fungal hyphae.

Picture credit: Frontiers Press

The scientific paper can be found here: NASA May Have to Look in Igneous Rocks to Detect Ancient Life on Mars.

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15 05, 2019

An Inspiring School Thought for the Week

By | May 15th, 2019|General Teaching|Comments Off on An Inspiring School Thought for the Week

An Inspiring School Thought for the Week

Whilst on a visit to a primary school to deliver a series of dinosaur and fossil themed workshops, an Everything Dinosaur team member spotted an inspiring thought for the week, a quotation from Sir David Attenborough.  Recently, the nonagenarian, naturalist and broadcaster has done a great deal to highlight global warming and climate change and the potential impact on our own species.  Posted up around the school and present in all the classrooms our staff member visited, was this quotation, helping to focus minds and to raise awareness.

Sir David Attenborough Provides an Inspirational Thought for the Week

Sir David Attenborough.
Life on Earth first shown in 1979. Sir David Attenborough helping to inspire pupils.

Thought for the Week

The quotation from Sir David reads:

“Cherish the natural world, because you’re a part of it and you depend on it.”

For the senior leadership team within a school, the publishing of a thought for the week, or even a thought for the day, should not become merely a routine.  Such a policy, at its best, should provide the starting point for debate and conversation, helping to trigger the pupil’s thinking processes and to permit reflection.  Staff too can play an important role as reflective practitioners helping to shape the debate and discussion.  Such inspirational thoughts can promote change and a re-thinking of attitudes.

Posting up comments from leading thinkers can provide the stimulus for conversations about fundamental issues affecting us all.  On this topic, one of our favourite quotations is from Nelson Mandela:

“Education is the most powerful weapon which you can use to change the world.”

Young activists such as Greta Thunberg are helping to change attitudes and to shape thinking.  The next generation has a key role to play in shaping our relationship with the natural world and the use of a thought for the week policy in the school brings issues to the fore and promotes involvement in the wider debate.

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