Keeled Sickle Ribbed Ammonite Fossil Replica

A slim, compressed ammonite with fine sickle-shaped (falcate) ribs. The preview shows ribs that curve forward as they cross the flanks, a sharp, narrow outer edge, a smooth stepped centre with a small hole through the middle, and a flaring final whorl. One solid piece, about 7.1 cm across and under 1 cm thick. Sickle ribs and a keeled outer edge are typical of the hildoceratid ammonites, such as Hildoceras and Harpoceras, from the Early Jurassic about 183 to 174 million years ago. They are clas…

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