4.8" Ammonite (Promicroceras) Cluster - Marston Magna, England

This is a 4.8" tall stone containing many small ammonite fossils. The ammonites are of the species Promicroceras marstonense and are Lower Jurassic (~200 million years old) in age. This rock is quarried from near Marston Magna, Somerset, England. Locally this ammonite filled rock is known as "Marston Marble".

The piece has been painstakingly prepared with mechanical tools to expose all of the individual ammonite fossils.

Ammonites were predatory cephalopod mollusks that resembled squids with spiral shells. They are more closely related to living octopuses, though their shells resemble that of nautilus species. True ammonites appeared in the fossil record about 240 million years ago during the Triassic Period. 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
Promicroceras marstonense
LOCATION
Marston Magna, Somerset, England
FORMATION
Obtusum Zone
SIZE
Rock 4.8 x 3.9 x 1.55"
ITEM
#176368
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