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Image of an ichthyosaur with skin impression preserved.
"But no sooner did we start cutting into it than we found the first skin impression.
The oldest skin impression preserved with hair is 160 million years old and belongs to a mammal.
However, this original interpretation was found to be an exaggeration based on the relatively fine scalation of the Gorgosaurus skin impression (approximately as fine as a Gila monster's).
These were present at 6 to 8-fold lower levels in mutant embryos, confirming the visual skin impression (see Figure 1i).
You might like to place it in a sock to stop it from getting sweaty or creating a skin impression if you lie on it.
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Once considered rare, skin impressions are increasingly being recognised during excavations and brought back to museums for preservation and analysis.
Until really very recently, these were perceived as exclusively scaly given their relative evolutionary distance from the theropods and the fact that we have numerous skin impressions and bits of mummified skin for quite a few of them.
There are some specimens here — a six-foot-tall femur of a Camarasaurus, sauropod vertebrae, fossils of skin impressions — yet the focus is not on artifacts but on how these creatures' bodies worked.
Now we can be quite confident that a variety of dinosaurs did have scales since we have various bits of fossil skin or skin impressions in rocks, but just because we have say some skin from the legs, doesn't mean there were not feathers elsewhere on the body.
Despite the detailed and thorough paper on this new baby, there is clearly more to come – on top of the preserved beak there are also traces of skin impressions on the legs and doubtless other researchers and already queuing up to take a look at this important and wonderful fossil.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com