Craspedites
nodiger Ammonites
Phylum
Mollusca, Class Cephalopoda, Subclass
Ammonoidea, Order Ammonitida
Geological
Time: Upper Jurassic, Tithonian Stage (150 mya)
Size: 44
mm diameter
Fossil Site:
Saratov, Volga Region, Russia
 This
spectacular ammonite, known as Craspedites nodiger, has chambers
preserved as grayish-white Calcite crystals, with the septa (divisions)
between each chamber preserved as black Calcite. The intricate suturing
that 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, is readily
seen here. It is this delicate suturing for which these ammonites
are well known. This is a large example of an ammonite from the
Tithonian Stage (150 m.y.a) deposits of Russia.
Also
see: Ammonite Fossils |
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