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Lower Cretaceous
or ‘fool’s gold’
which averages a mere 7 meters in length
The once hollow chambers of the shell of this extinct marine Cephalopod (something akin to a shell–dwelling squid) have been filled with deposits of calcite
apart from being an aquatic mollusc) from the extinct Cymatoceras sakalavus
Knightia Fish white ammonite Lower CretaceousA single fossilised Knightia fish in a limestone matrix, found in Fossil Lake, Wyoming, USA. The unusual chemistry of this region has led to Fossil Lake having the highest concentration of fish fossils anywhere in the world. This species is thought to be distantly related to modern day herrings and sardines. Eocene age, circa 50 million years old. Each full fish is approximate 6cm. Matrix (bed rock) size 10cm x 8cm x 0. 5cm Measurements are
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