4.85" Fossil Ammonite (Placenticeras) - South Dakota
This is an ammonite (Placenticeras meeki) that was collected from the Cretaceous-aged Pierre Shale of South Dakota. This ammonite was found broken and incomplete, requiring some crack repair and gap fill restoration.
Comes with a display stand.
Comes with a display stand.
These 70 million year old ammonites lived when South Dakota was a shallow inland sea. They were found preserved in concretions when split open. They then had to be hand-prepared to remove the hard rock surrounding them from their shells, a very time consuming task.
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.
SPECIES
Placenticeras meeki
AGE
LOCATION
Cheyenne River, South Dakota
FORMATION
Pierre Shale
SIZE
4.85" Wide
CATEGORY
SUB CATEGORY
ITEM
#262690
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