3.2" Hoploscaphites Brevis Ammonite With Gastropods

This is a beautiful, 3.2" wide Hoploscaphites brevis from the Pierre Shale of South Dakota. It was found inside of a hard concretion and the rock had to be meticulously prepared away. There is a second ammonite, plus baculites and gastropods also present. The base of the rock has been cut flat so that the piece displays nicely on a flat surface. A really gorgeous piece.

Ammonites were predatory cephalopod mollusks that resembled squids with spiral shells. They are more closely related to living octopuses, though their shells resemble that of nautilus species. True ammonites appeared in the fossil record about 240 million years ago during the Triassic Period. The last lineages disappeared 65 million years ago at the end of the Cretaceous.

What an ammonite would have looked like while alive.
What an ammonite would have looked like while alive.
Hoploscaphites brevis
Meade County, South Dakota
Fox Hills Formation - Timber Lake Member
Ammonite 3.2" wide, entire piece 4.7" tall
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