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Ordovician 443 to 490 million years ago During the Ordovician, Oklahoma was located south of the equator and was covered with shallow sea. The nearest land was far to the northeast of Oklahoma. Brachiopods and the extinct trilobites were the most common invertebrate animals of the Ordovician seas. Less common were familiar animals like corals, clams and snails. Bacteria formed large, pillow-like mounds in shallow water. These mounds, called stromatolites, are common in early Ordovician rocks. Stromatolites form today in bays along the west coast of Australia. Simple armored fishes with teeth also lived in the seas but there was no animal life on land. You can find fossils of Ordovician age in limestones of the Arbuckle Mountains of south-central Oklahoma. Here are some common Oklahoma fossils from the Ordovician. |
Common Fossils of Oklahoma Geologic Time
Fossil Images What is a...? |
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