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8.1" Ammonite (Promicroceras) Cluster - Somerset, England
This is a polished free standing piece 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 and by slicing and polishing it the beautiful inner chamber detail of the ammonites can be seen.
One face of this specimen has been polished, while the opposite side has been left rough with dozens of observable, complete ammonites. The base of the rock has been cut flat for presentation purposes.
One face of this specimen has been polished, while the opposite side has been left rough with dozens of observable, complete ammonites. The base of the rock has been cut flat for presentation purposes.
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.
SPECIES
Promicroceras marstonense
LOCATION
Marston Magna, Somerset, England
FORMATION
Lower Lias, Obtusum Zone
SIZE
8.1 x 5.5", 1.35" thick
CATEGORY
SUB CATEGORY
ITEM
#129289
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