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with fossils found in Neogene strata of North America
The bone was probably overlain by a tough
When it lived: Cretaceous Perion 75 million years ago
The front and back edges of the canines were serrated when they first grew
Other contemporary records confirm her account
Asteroceras obtusum, ammonite Argentinosaurus with fossils found in NeogeneAmmonites are an extinct group of molluscs that are thought to be related to modern cephalopods such as octopus, squid and cuttlefish. They emerged during the early Devonian era (about 400 million years ago) and became extinct 65 million years ago at the end of the Cretaceous period. This Asteroceras obtusum fossil dates back to the Jurassic period (about 200 145 million years ago) and was found in Lyme Regis in Dorset, UK. Note the second smaller