This is the largest Ammonite cast available on the web. From The Jurassic Of The United Kingdom. This is from the Henry Ward collection.
Ammonite cast replica
31" DIAMETER, 11" THICK
Ammonites giganteus cast replica
One of the largest Ammonite casts available on the web. From The Jurassic Of The United Kingdom.
This cast is from the Henry Ward collection.
Cast measures 31 inches in diameter.
Ammonites, as they pertain specifically to the order Ammonitida, are an extinct group of marine animals belonging to the cephalopod subclass Ammonoidea. They are excellent index fossils.
The closest living relative of the Ammonitida, is not the modern Nautilus which they somewhat outwardly resemble, but rather the subclass Coleoidea (octopus, squid, and cuttlefish).
Their fossil shells usually take the form of planispirals, although there were some helically-spiraled and non-spiraled forms (known as "heteromorphs"). Their name came from their spiral shape as their fossilized shells somewhat resemble tightly-coiled rams' horns. Pliny the Elder (d. 79 A.D. near Pompeii) called fossils of these animals ammonis cornua ("horns of Ammon") because the Egyptian god Ammon (Amun) was typically depicted wearing ram's horns. Often the name of an ammonite genus ends in -ceras, which is Greek for "horn" (for instance, Pleuroceras)
Kingdom: Animalia, Phylum: Mollusca, Class: Cephalopoda, Subclass: Ammonoidea, Order: Ammonitida
Suborders: Ammonitina, Ancyloceratina, Phylloceratina, Lytoceratina.
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