Nice Discoscaphites Gulosus Ammonite Cluster - South Dakota

These are two small, 1.3" wide Discoscaphites gulosus ammonite cluster from the Fox Hills Formation of South Dakota. The limestone has been cut flat to allow the ammonite to display 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.