4.5" Fossil Ammonite (Rhaeboceras) - South Dakota

This is a 4.5" ammonite (Rhaeboceras) from the Fox Hills Formation of South Dakota. This amazing specimen has beautiful shell on one side that is iridescent and shows areas of inner shell sutures. On the reverse side much of the shell is missing, giving a view of the inner structures of the shell. A striking display.



Ammonites were predatory mollusks that resembled a squid with a shell. These cephalopods had eyes, tentacles, and spiral shells. They are more closely related to a living octopus, though the shells resemble that of a nautilus. Ammonites appeared in the fossil record about 240 million years ago and they barely survived several major extinction events. The last lineages disappeared 65 million years ago at the end of the Cretaceous.

FOR SALE
$245
DETAILS
SPECIES
Rhaeboceras halli
LOCATION
South Dakota
FORMATION
Fox Hills Formation
SIZE
4.5"
ITEM
#115161
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