Description
Black Ammonite. Asteroceras obtusi. A superb black ammonite, free from the matrix, measuring 24-50mm, similar to the picture. The ribbing on this is beautiful and very detailed. Early Jurassic, Huancayo, Peru
Asteroceras is an extinct genus of cephalopod belonging to the Ammonite subclass. These fast-moving nektonic carnivores lived during the Triassic and Jurassic periods (from 205.6 to 189.6 Ma).
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