SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Ammonites. Ammonite fossils embedded in rock. Several small Promicroceras martonense shells can be seen on one large Xipheroceras dudresseri shell. Ammonites are extinct marine animals which lived between 380 and 65 million years ago. They are distantly related to the modern-day nautilus. They lived in coastal waters and inland seas. Ammonites are known as zone fossils which means that certain species appear in specific geological formations, allowing accurate dating. This fossil was found in the lower lias rock of Lyme Regis, England. Lower lias is limestone rock which was laid in the early Jurassic period (195-172 million years ago).
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