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Fossil Ammonite And Cephalopod Association - South Dakota
This is an intriguing association of an ammonite (Hoploscaphities sp.) and a straight-shelled cephalopod (Baculites sp.). The specimen was collected from the Fox Hills Formation of South Dakota. It has been partially prepped free from the rock it was found in. Overall, it is a really cool little association.
This specimen comes with an acrylic display stand.
This specimen comes with an acrylic 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
Hoploscaphities sp. & Baculites sp.
AGE
LOCATION
South Dakota
FORMATION
Fox Hills Formation
SIZE
Ammonite: 1" wide, Largest Baculites fragment: .8" long, Rock: 1.8 x 1.2"
CATEGORY
SUB CATEGORY
ITEM
#190068
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