The ammonoid fossils are found in the geological formation of

The ammonoid fossils are found in the geological formation of the Jurassic age. Ammonoids or ammonites are a group of extinct marine cephalopod mollusk. These marine mollusks died about 66 million years ago. They possess a coiled shell like a cinnamon roll. Cephalopoda divides into three subgroups (i) coleoids, (ii) nautiloids, and (iii) ammonites.

Ammonites first appeared about 420 million years ago in the early Devonian Period, Paleozoic era, and died about 66 million years ago at the end of the Cretaceous Period. They are extinct due to the impact of an asteroid at the end of the Cretaceous Period. Ammonoids faced three major extinction in their 340-million-year of history. They are at the end of the Devonian (350 million years ago), Permian, and Triassic Periods (200 million years ago), and the terminal extinction at the end of the Cretaceous Period (66 million years ago). Over 10000 or more species of ammonites have been discovered.

The size of ammonites ranges from a few millimeters to a few meters. Ammonoids from the Paleozoic Era were the size of a golf ball or smaller and ammonoids from the Cretaceous Period were larger with diameters up to 2-3 meters. The largest ammonite species discovered is Parapuzosia seppenradensis. The species belongs to the Late Cretaceous Period. Evidence suggests that ammonites feed on zooplankton, crustaceans, and other small ammonites.