During the late Mississippian Ohio was covered by a shallow sea. Near the end of the Mississippian the seas withdrew from the state.
Special permission to collect fossils must be obtained from Ohio State Parks. Between the two depths a reef system composed of corals and sponges formed. Ohio was 20 degrees south of the equator.
Others include brachiopods, cephalopods, trilobites, horn corals, snails, clams, echinoderms, and graptolites. Ohio was dry land during the early Silurian. The first land plants in the state grew during the Devonian. Sand and mud deposited on local river deltas gradually filled in the swamp.
Ohio is well known for having a great quantity and diversity of fossils preserved in its rocks. Ohio was twenty degrees south of the equator at the time. For more information, call (513) 734-4323. Hueston Woods State Park (Preble/Butler Counties) – Geology: Ordovician; fossils ranging from 450 to 500 million years old in limestone and dolomite forming the western edge of the Cincinnati Arch. Sea levels rose and fell sporadically so the rock record shows a history of land, freshwater, and sea deposits.
For more information, call (513) 563-2985. Northwest Fossil Park (Lucas County) – Geology: Devonian; fossils around 375 million years old found in shale of the Silica Formation. Amphibians, reptiles, and freshwater clam fossils are also known from the time.
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