14.4" Cut & Polished Ammonite (Speetoniceras) Fossil With Druzy Pyrite

 
 
 
 
 
 
 
 
 
 
 
 
 
This is a large, 14.4" (each) wide Speetoniceras ammonite fossil from the Lower Cretaceous deposits of the Volga River in Russia. It has been cut in half and polished, revealing the inner chamber structure. The chambers are filled with a mixture of calcite (simbircite?) and druzy pyrite crystals. There is an additional cross section of an ammonite fossil within one of these chambers. Much of the pyrite that surrounded this ammonite has been left over its exterior. This is a gorgeous display piece and it comes with a stand to facilitate aesthetic presentation of each half.

Under both short and long-wave UV, the calcite fluoresces a white color. There has been some restoration and repair to the ammonite. Several cracks have been repaired and filled on the backside and it's likely some of the pyrite has been added.

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. True ammonites appeared in the fossil record about 240 million years ago. The last lineages disappeared 65 million years ago at the end of the Cretaceous.

DETAILS
SPECIES
Speetoniceras sp.
LOCATION
Volga river, Ulyanovsk region, Russia
SIZE
Each half 14.4" wide
CATEGORY
SUB CATEGORY
ITEM
#175077
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