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Reptile tracks

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Reptile tracks

Fully labelled image of the Australian slab, showing interpretation of the tracks. Footprints of front feet (manus) are shown in yellow, hind feet (pes) in blue. The slab carries two trackways, A and B. For each of these, the footprints are coded as follows: Am1 to Am4 means “Trackway A, manus print 1” to “Trackway A, manus print 4”. Ap1 etc. means “Trackway A, pes print 1” etc.. Bm1-4 and Bp1-4 mean the same for Trackway B. Blue and yellow zig-zag lines linking prints indicate the sequence manus and pes prints in each trackway. The label “Ip” next to a white oval means “Isolated pes print”, a single footprint facing the opposite direction to the trackways.
Grzegorz Niedźwiedzk
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By:
Grzegorz Niedźwiedzk
File format:
.jpg
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2827 x 2613, 2.18 MB
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  • The combination of claw marks and the shape of the feet suggests that the tracks were made by a primitive reptile. The image shows a reconstruction of the reptile. Illustration: Marcin Ambrozik.

    355 million-year-old footprints rewrite the history of backboned land animals

    Newly discovered fossilised footprints with long toes and claws have been found in a rock slab from Australia. The discovery pushes the origin of reptiles back by 35 million years and overthrows the established evolutionary timeline of backboned land animals. The study, led by researchers at Uppsala University, has been published in the journal Nature.