Knightia Fish white ammonite The once hollow chambers of

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

which averages a mere 7 meters in length

With field plaster to the back of the piece

Found in the Mrakib

Knightia Fish white ammonite The once hollow chambers ofA 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