1.9" Iridescent Sphenodiscus Ammonite - Green Hues

This is a 1.9" wide Sphenodiscus sp. from the Fox Hills Formation of SD. It has some brilliant, green iridescent hues to it. The rock has been shaped so that it stands up on it's own without a stand.

These 70 million year old ammonites lived when South Dakota was a shallow inland sea. It was found preserved in a concretion that was split open. It then had to be hand prepared to remove the hard rock surrounding it from the shell, a very time consuming task.