Each polished face of the 1st quality white ammonite fossil pair is approximately 3.3 inches long with a combined width of 1.6 inches. These weigh approximately 8.2 ounces or 234 grams. The inside faces are polished and some of the chambers are lined with calcite. This listing is for both halves. 92905
History of Ammonites
There were many different types of ammonites dating between the Jurassic and Devonian periods (65 and 419 million years ago). The more complex the ammonite fossils, the more recently they were created in those periods. Ammonites died away at the same time as the dinosaurs.
Ammonites (subclass Ammonoidea) can be distinguished by their septa, the dividing walls that separate the chambers and are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopada. These molluscs are more closely related to living coleoids such as octopuses, squid, and cuttlefish.