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Questions tagged [fossil]

A fossil (from Classical Latin fossilis; literally, "obtained by digging") is any preserved remains, impression, or trace of any once-living thing from a past geological age.

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Tetrapod Evolution [on hold]

It has been known for a number of years that there have been tetrapod tracks predating Stegocepgalians by tens of millions of years at the least, and now this article has put forward the claim the ...
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Simple and inexpensive astrobiological studies at MDRS

MDRS is a Mars analogue station where volunteers live in Southeast Utah desert for two weeks and perform experiments. Some of these experiments are done in conjunction with public outreach for middle ...
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What is this row of pits along the “upper lip” of theropod skulls?

Consider the row of pits visible in the "upper lip" area (and to some extent, the "lower lip" too) of this T-Rex skull at the Palais de la Découverte, Paris (picture from Wikipedia): I noticed ...
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What could explain discrepancies between dates provided by the fossil record vs. the molecular clock?

I am studying a mud snail genus called Ecrobia. For the Caspian species (Ecrobia grimmi), there is a discrepancy between dates provided by the fossil record and the molecular clock: First appearance ...
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Can we investigate the cell biology of extinct microorganisms?

I know that there are microfossils, but not if we can we know about the organelles, genetics or macromolecules of the cells that left them behind.
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How exactly is the wood fossil process?

I would like to know in deep how exactly is the wood fossilisation process. I am fascinated how after millions of years the fossil wood preserves its microscopic characteristics. Look at this cross ...
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examples of transitional fossils showing development of internal skeleton

What fossils exist that show the development of skeletons, and muscles attached to bones?
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How can paleontologists identify morphologically different fossils as members of the same species?

I recently saw a documentary about Tyrannosaurus rex, which detailed the growth stages of the dinosaur. Apparently, it underwent a huge growth spurt at around 14 years of age, growing into the massive ...
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Are these 3.5B year old fossils the oldest on earth?

The following commentator writes: Researchers at UCLA and the University of Wisconsin–Madison have confirmed that microscopic fossils discovered in a nearly 3.5 billion-year-old piece of rock in ...