Pyritised Ammonite (Asteroceras obtusum)
Nature (Lower Jurassic, Sinemurian stage)
Common
Date
c. 195 million years BP
Medium / Material
Pyritised ammonite in limestone matrix
Production Place
Black Ven, Lyme Regis, Dorset, England
Dimensions
H 85 × W 85 × D 20 mm · 145 g
A well-preserved coiled ammonite cephalopod from the Lower Jurassic cliffs of the Dorset coast, partially replaced by golden iron pyrite.
Materials & Techniques
Iron pyrite, calcite, limestone