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Devonian 354 to 443 million years ago This was a time of change in Oklahoma. Oklahoma continued to be located south of the equator and covered by a shallow sea, but the land mass north and east of Oklahoma grew larger and became closer. The most abundant invertebrate animals that lived in this sea were brachiopods, trilobites and corals, with clams, snails and crinoids also present. Stromatolites were rare in Oklahoma during the Devonian. The oldest fossils of land plants in Oklahoma are found in rocks that formed near the end of the Devonian period. These fossils are the petrified wood of large trees that grew on the expanding land mass. It was during the Devonian that the first vertebrate animals ventured onto land, although none have been found in Oklahoma. You can find fossils of Devonian age in limestones and shale of the Arbuckle Mountains of south-central Oklahoma and in some areas of eastern Oklahoma. |
Common Fossils of Oklahoma Geologic Time
Fossil Images What is a...? |
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