Abstract
Some units of the middle Chickamauga Group in eastern Tennessee are time-transgressive and interfingered laterally, not time-stratigraphic units or formations as interpreted by some previous workers. Detailed environmental sedimentologic investigations in this area show two cycles of delta formation in Middle Ordovician time. The first cycle produced the Tellico Formation and its Notchy Creek (Holston) facies. The second cycle, which started as soon as the first cycle was completed, had a slight shift eastward and produced the Chota (Hawkins member of the Ottosee Shale) and Chapman Ridge units.
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