Cobble Creek: Dactylioceras Ammonite with Cut Base from Whitby to Robin Hood's Bay, Yorkshire Coast, United Kingdom
Great looking Dactylioceras Ammonite. This would be great for your collection or sitting on your desk. With the cut base on this piece, it displays very nicely. Some repair work has been completed on this specimen to ensure years of enjoyment for any collector.
Weight: 611 grams / 21.55 ounces / 1.34 pounds
Height: 3.2" inches / 82 mm
Width: 1.8" inches / 45 mm
Length: 3.8" inches / 96 mm
Species Name: Dactylioceras commune
Formation: Whitby Mudstone Formation
Location: Whitby to Robin Hood's Bay, Yorkshire coast
Country of Origin: UK
Ammonoids are an extinct group of marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs are more closely related to living coleoids (i.e., octopuses, squid, and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species. The earliest ammonites appear during the Devonian, and the last species died out during the Cretaceous–Paleogene extinction event.
Ammonites are excellent index fossils, and it is often possible to link the rock layer in which a particular species or genus is found to specific geologic time periods. Their fossil shells usually take the form of planispirals, although there were some helically spiraled and nonspiraled forms (known as heteromorphs).
The name "ammonite", from which the scientific term is derived, was inspired by the spiral shape of their fossilized shells, which somewhat resemble tightly coiled rams' horns. Pliny the Elder (d. 79 AD 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 (κέρας) for "horn".
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