PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Shellfish fossils. Rocks containing fossils of a Homarus hakelensis lobster (large) and a number of Capopenaeus callirostris shrimps. Fossils appear as rock slowly forms around objects buried in mud. As the rock forms, the shape and anatomy of buried animals and plants can be preserved. These specimens were formed from one rock split in two. This is why each shows a mirror image of the other. The rocks measure 35 centimetres across and date from around 95 million years ago in the Cenomanian age of the late Cretaceous epoch.
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