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Limestone with ammonites

Psiloceras planoribis, Lower Jurassic period. What time is it? If you found this index fossil in a rock, you'd know. The animal was once widespread but quickly became extinct. Only a small percentage of fossils meet these criteria.

Group: Sedimentary
Image Number: 97-36383
Catalog Number: 430979
Time Period: Jurassic Period
Loan from Department of Paleobiology
Locality: Somerset , England

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Smithsonian National Museum of Natural History Department of Mineral Sciences website Credits