1.9" Carboniferous Ammonite (Muensteroceras) Fossil - Indiana

This is 1.9" wide fossil ammonite of the species Muensteroceras parallelum, collected from the Rockford Formation of Rockford, Indiana. The outer shell is gone leaving the chamber patterns exposed.



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.


DETAILS
SPECIES
Muensteroceras parallelum
LOCATION
Rockford, Indiana
FORMATION
Rockford Formation
SIZE
1.9" Wide
CATEGORY
ITEM
#126192
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