6" Marston Magna Ammonite Cluster - Polished on Back

 
 
 
This is a very cool plate of small ammonite fossils from Marston Magna, Somerset, England. On one side of the plate, the ammonites have been prepared from the rock, and the back side has been cut and polished to reveal the ammonites in cross-section. 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.

The polished face is 6x4.9" and the rock varies in thickness, up to 1.3" thick. It comes with an acrylic display 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
6" wide, 4.9" tall
ITEM
#30743
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