Gems from a desert ocean

Cretaceous shellfish - carnivores

The internal shells (guards) of extinct belemnites, squid-like animals.

These internal shells were composed of calcite that has been replaced by opal.

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The internal shells (guards) of extinct belemnites, squid-like animals. These internal shells were composed of calcite that has been replaced by opal. Early Cretaceous (Aptian), Bulldog Shale, Coober Pedy, South Australia.
The internal shells (guards) of extinct belemnites, squid-like animals. These internal shells were composed of calcite that has been replaced by opal. Early Cretaceous (Aptian), Bulldog Shale, Coober Pedy, South Australia.

Early Cretaceous (Aptian), Bulldog Shale, Coober Pedy, South Australia.

Cretaceous Shellfish:

Origin of Opal

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