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Shale with graptolites

Tetragraptus approximatis, Ordovician Period. What time is it? If you found one this index fossil in a rock, you'd know. Each animal was once widespread but quickly became extinct. Only a small percentage of fossils meet these criteria.

Group: Sedimentary
Image Number: 97-36380
Catalog Number: 78508
Time Period: Ordovician Period
Loan from Department of Paleobiology
Locality: Point Levis, Quebec , Canada

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