PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Fossilised shells. Piece of rock containing various different types of fossilised shells. Most of these shells are from bivalve molluscs similar to oysters and mussels. 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.
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