'Belemnites are extinct cephalopod molluscs. The internal shells of belemnites (called a guard or rostrum) are commonly found in Jurassic and Cretaceous deposits, preserved as dense, fibrous calcite. The name is derived from the Greek word for dart and refers to the pointed end of belemnite guards.' - Natural History Museum
 
Belemnite fossil found on Whitby beach.
 
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