Schnecke No. 42-22105774
by Gavin Kingcome - © Corbis. All Rights Reserved. - © Gavin Kingcome/Science Photo Library/Corbis
Ammonite
Original caption: Ammonite fossil. Ammonites are extinct marine invertebrates. They first appeared in the Late Silurian to Early Devonian period (around 400 million years ago) and became extinct at the end of the Cretaceous period (65 million years ago). --- Image by © Gavin Kingcome/Science Photo Library/Corbis