4.5" Promicroceras Ammonite Cluster - Dorset, England

This is a beautiful cluster of agatized, Promicroceras planicosta ammonites from the Lyme Regis region of England. They arealmost translucent and has been nicely prepared so that it displays nicely in a slab of limestone. The base has been cut flat so that it stands up nicely on a hard surface. The entire piece is 4.5" tall with the largest ammonite being .9" across.

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 planicosta
LOCATION
Charmouth, Dorset, England
FORMATION
Lower Lias, Obtusum Zone
SIZE
4.5" Tall, 3.6" wide, largest ammonite .9"
ITEM
#65363
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