313 million-year-old trace fossils. Attenosaurs were reptile-like amphibians. This footprint is about the size of an adult human hand. The amphibian trackway is called Nanopus reidiae. Its maker would have looked like a salamander. There is a third trace fossil on the slab. Can you find it?
Read a lot more about this in our book "Footprints in Stone."
https://www.amazon.com/Footprints-Stone-Fossil-Coal-Age-Tetrapods/dp/0817358447/ref=sr_1_1?s=books&ie=UTF8&qid=1469797628&sr=1-1&keywords=%22footprints+in+stone%22
This book helped the American museum solve an 87 year old mystery:
https://www.ua.edu/news/2018/01/ua-book-helps-solve-87-year-old-fossil-mystery/
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