Paracadoceras sp
Geological Time: Jurassic, Callovian Stage
Size (25.4
mm = 1 inch): 100 mm diameter, 50 mm across Living chamber 60 mm by
38 mm
Fossil Site: Volga River, Russia
Code: RA379
Price: $235.00 - sold
 Description:
A superb example of an ammonite of the genus Paracadoceras of the
Callovian Stage (161 m.y.a) deposits of Russia which is entirely free
of matrix. Ammonites of this degree of preservation are difficult
to come across. The high degree of preservation of 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. The lack of acidity in the depositional
environment allowed them to be preserved as you see here. |
