Ammonite (Orthosphinctes) & Gastropod Fossil on Rock - Germany

This is a beautiful ammonite and gastropod fossil association that was collected from the Gräfenberg Quarry of Bavaria, Germany. The ammonite is of the genus Orthosphinctes (Lithacosphinctes) sp. and the gastropod is an unidentified. It's upper Jurassic in age, or approximately 155 million years old. The majority of the rock surrounding the ammonite has been cleaned away.

The Gräfenberg Quarry is famous for the green ammonites (mostly Ardescia) that are found within the sedimentary rock. The green coloration of the ammonites is caused by the mineral glauconite. When exposed to weathering or erosion, glauconite will change color to orange, brown and/or yellow.

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.

What an ammonite would have looked like while alive.
What an ammonite would have looked like while alive.


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DETAILS
SPECIES
Orthosphinctes (Lithacosphinctes) sp. (Ammonite) & Unidentified Gastropod
LOCATION
Gräfenberg Quarry, Bavaria, Germany
FORMATION
Malm Gamma 1
SIZE
.9" wide ammonite on 4.6 x 3.2" rock
ITEM
#125895
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