Ammonite / Perisphinctes boweni / France

Ammonite / Perisphinctes boweni / France

$275.00
Availability: Out of stock

Quick Overview

This Perisphinctes specimen is nicely sized, but not so large that it couldn't easily be displayed on most anyone's selves or tables. As either an excellent accent to one's surroundings, or behind glass, one can easily appreciate that the specimen's form has not been altered, as have many others which come on the market.
Measures: 8.5" across x 1" thick
Location: Oxfordian formation, Fontenay, France
Time Period: Jurassic / ~ 149 mya


More information below.

More Information:

Named for the English geologist Edmund John Bowen, its discoverer, Perisphinctes boweni is an important Ammonite species, as it is referred to as an "index fossil". Index fossils are life forms (normally sea dwellers) which were largely dispersed throughout the planet. They are used to help date and determine occurrences of the strata in which they are found.

 

Ammonites are an extinct group of marine animals in the Cephalopoda class. They are invertebrates and are more closely related to coleoids (squids, octopus, and cuttlefish) than they were to the chambered nautilus, even though they looked much more similar to the nautilus. The name Ammonite was derived from "ammonis cornua," translated to mean Horns of Ammon. Ammon was an Egyptian god that was typically depicted wearing ram horns, whose spiraled shape is similar to that of an Ammonite. Ammonites first appeared in the oceans during the Devonian Period, some 400 million years ago. But, between 145 and 65 million years ago these extinct marine creatures, flourished in a warm, shallow sea which covered much of the earth. As the shells of the creatures accumulated on the sea floor, they were buried by sediment and over the ages, transformed into stone by physical and chemical processes. The chambers of the Ammonite acted as tiny geodes, allowing calcite to form crystals throughout. Ammonites died out around 65.5 million years ago along with the dinosaurs.