Fossil Ammonites (Jeletzkytes & Discoscaphites) - South Dakota

This is a 3.6" wide section of rock that contains a Discoscaphites conradi (.75" wide) ammonite and a Jeletzkytes dorfi (.9" wide) ammonite, collected from the Fox Hills Formation of South Dakota. There are two other unidentified ammonites within the rock that have been partially exposed. The Discoscaphites at the center of the specimen was removed from the rock it was found in, prepared and then remounted to this rock.

Comes with an acrylic display stand to assist with presentation.

These 70 million year old ammonites lived when South Dakota was a shallow inland sea. It was found preserved in a concretion that was split open. It then had to be hand prepared to remove the hard rock surrounding it from the shell, a very time consuming task.

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. True ammonites appeared in the fossil record about 240 million years ago. The last lineages disappeared 65 million years ago at the end of the Cretaceous.

DETAILS
SPECIES
Discoscaphites conradi & Jeletzkytes dorfi
LOCATION
North Central, South Dakota
FORMATION
Fox Hills Formation
SIZE
Ammonites: .75" & .9", Rock: 3.6 x 2.1" rock
ITEM
#189344
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