Assorted ammonites and echinoids
Middle Jurassic (Oxfordian)
Alsace, France

62mm x 47mm limestone block etched via acid. Includes Cardioceras sp., Cerithium sp., Thurmanella thurmani, Polydiadema superba and bivalves

Silicified ammonites are beautifully preserved fossil invertebrates where the original shell material has been replaced by silica over millions of years. This rare form of preservation often reveals stunning internal details like suture patterns and chamber walls in sharp, three-dimensional clarity. These fossils not only showcase the intricate beauty of ancient ammonites but also provide valuable scientific insights into their structure and evolution.