4.1" Ammonite (Orthosphinctes & Sutneria) Fossils - Germany

This is a beautiful ammonite fossil association containing three ammonites, two of the genus Orthosphinctes (Lithacosphinctes) sp. and the smallest ammonite is of the species Sutneria platynota, collected from the Gräfenberg Quarry of Bavaria, Germany. They're upper Jurassic in age, or approximately 155 million years old. The majority of the rock surrounding the ammonites has been cleaned away.

The largest ammonite (Orthosphinctes) is 4.1" wide, the center ammonite (Orthosphinctes) is 1.5" wide and the smallest ammonite (Sutneria) is .7" wide. The center ammonite appears to have been cleaned and then remounted onto the rock.

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. 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.

Orthosphinctes (Lithacosphinctes) sp. & Sutneria platynota
Gräfenberg Quarry, Bavaria, Germany
Malm Gamma 1
Ammonites are 4.1", 1.5" & .73"
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