3.1" Ammonite (Promicroceras) Fossil Cluster - Somerset, England

 
This is a slab of rock containing many small ammonite fossils, often referred to as "Marston Magna Marble". 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 with many beautiful detailed ammonites can be seen. The base has been cut flat so it will display without the use of a stand.

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
Promicroceras marstonense
LOCATION
Marston Magna, Somerset, England
FORMATION
Lower Lias, Obtusum Zone
SIZE
3.1"x2.4", .6" thick
ITEM
#63496
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