Unbelievable Russian Heteromorph Ammonite

This is a very impressive and lustrous heteromorph ammonite for sale from the Volga River region of Russia. This natural ammonite is beautifully displayed in it's original argyllite matrix. This specimen exhibits extensive opalescent mother-of-pearl along with diffuse pyritization.

There is about 12% restoration on the ammonite and the matrix to make it more displayable. This is typical for most Audiloceras ammonites sold from this region.

Most ammonites are homomorphs meaning that they retain their spiral shell shape throughout growth. Heteromorph (different shaped) ammonites developed during the late jurassic and have uncoiled shells. It's hard to imagine how this shape would have given them a evolutionary advantage as it would have hindered fast movement.
DETAILS
SPECIES
Audoliceras
LOCATION
Volga river, Ulyanovsk region, Russia
FORMATION
N/A
SIZE
8" long
CATEGORY
SUB CATEGORY
ITEM
#476
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