Craspedodiscus
sp. Ammonite
Phylum
Mollusca, Class Cephalopoda, Subclass
Ammonoidea, Order Ammonitida
Geological
Time: Jurassic, Callovian Stage
Size: 384
mm diameter
Fossil Site:
Volga River Region, Russia
A
large, spectacular ammonite is a Craspedodiscus from the Volga River
region of Russia. The entire surface is covered with "firery"
opal iridescence of different colors, 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 it here. Jewel-quality
material such as this coming from Alberta, Canada is termed “Ammolite”
in the trade, and typically commands a high price. This is a stunning
example of an enherent beauty often seen when ammonites were preserved
in just the right environment.
Also
see: Ammonite Fossils |
|