The shallow seas that covered Oklahoma during parts of the Silurian, Devonian and Carboniferous periods were home to generally similar communities. Different kinds of rhynchonelliform brachiopods and crinoids were abundant, and bivalves, cephalopods and snails were also common, Trilobites became less common over time and were reduced in variety.
Can I find Silurian, Devonian or Carboniferous fossils in Oklahoma?
Fossils of Silurian and Devonian age can be found in rocks of the Arbuckle Mountains. Carboniferous rocks with abundant fossils are present over much of eastern and south-central Oklahoma.