Craspedites nodiger Ammonite
Geological Time: Upper Jurassic , Tithonian Stage (150 mya)
Size (25.4mm=1 inch): 68 mm diameter (each)
Fossil Site: Ulyanovsk, Volga Region, Russia
Fossil Code: AA026
Price: $65.00
 Description:
This spectacular ammonite is Craspedites nodiger from Russia which
has been split in half and polished to show the wonderful detail within.
The individual chambers are preserved as grayish-white Calcite crystals,
with the septa (divisions) between each chamber preserved as black
Calcite, making for a superb display piece. The reverse has preserved
most of the intricate suturing which provided strength for the shell
at low weight expense, an important feature for an animal which relied
on near neutral buoyancy to allow it to move freely throughout the
water column. It is this delicate suturing for which these ammonites
are well known; I have included a photo of an unsplit example. There
is also a small amount of the original nacreous shell preserved as
well, showing iridescent flash. This is a large example of an ammonite
from the Tithonian Stage (150 m.y.a) deposits of Russia, one that
is sure to be a fine addition to any ammonite collection. |
