Promicroceras planicosta-England 003

Taxa: Promicroceras planicosta

Age: Jurassic

Locality: Charmouth, Dorset, England

Promicroceras planicosta is a species of extinct ammonite from the Early Jurassic period, specifically the Sinemurian stage (approximately 199 to 190 million years ago). This species is well-known from fossil finds in Dorset, England, particularly in the famous Jurassic Coast region. Promicroceras planicosta had a small, tightly coiled shell with distinctive ribbing and flat sides, which are characteristic features of the species. These ammonites lived in marine environments, and their fossils are often well-preserved, providing valuable insights into the early Jurassic marine ecosystems.