Hoploscaphites Ammonite, Fox Hills Fm, South Dakota


For sale is an iridescent Hoploscaphites ammonite from the Fox Hills Formation in South Dakota. Preservation is good and details are quite fine. The back of it is plain; the shell must have eroded away. Other than that, this is a wonderful little fossil and 100% natural. This is one of my favourite ammonites in our collection as the nodes are intact and can fit perfectly in your hand.


Genus: Hoploscaphites

Length: 48.72mm (1.918")

Width: 41.85mm (1.648")

Weight: 30.03 grams (1.06 oz.)

Location: Fox Hills Formation, South Dakota

Age: Maastrichtian stage, 70 million years

Geological era: Mesozoic

Period: Cretaceous

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).

Source: www.wikipedia.org/wiki/Ammonoidea

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