Name: Kosmoceras sp.
Age: Jurassic, Callovian Stage
Size: mm (25.4mm=1 inch): 72 mm diameter matrix: 107 mm by 75 mm.
Location: Ulyanovsk, Russia
Code: RA197
Price: $165.00 - Sold
 Description:
A magnificent example of the ammonite Kosmoceras sp. of the Callovian
Stage (161 m.y.a) deposits of Russia. Ammonites of this degree of
preservation are difficult to come across. The high degree of preservation
of the natural mother-of-pearl shell makes it appear to be preserved
as fire opal. This is a consequence of light passing through the various
layers of aragonite and conchiolin deposited by the ammonite in life.
It is well presented on a 107 mm by 75 mm matrix base. |
