Large Red Iridescent Sphenodiscus Ammonite - 10.3"

This is a large, 10.3" wide Sphenodiscus splendens ammonite from the Fox Hills Formation that has a brilliant red iridescent shell. This beautiful iredescent shell is basically the same as the Ammolite (name trademarked) from Alberta.

This 70 million year old ammonite 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. The results are superb though and this ammonite would make a truly impressive display.