Name: Kosmoceras sp.
Age: Jurassic, Callovian Stage
Size: mm (25.4mm=1 inch): 65 and 75 mm diameter matrix: 105 mm by 75 mm
Location: Ulyanovsk, Russia
Code: RA195
Price: $175.00 - sold
 Description:
A magnificent example of a pair 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 singly, much less
as a pair. 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. They are well presented on a 105
mm by 75 mm concretionary matrix base. |
