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Mineralogy and Paragenesis of Large Dolostone Septaria: In the Late Devonian Huron Shale, North-Central Ohio

limited parking is available along the berms. No-trespassing signs are posted at other river crossings. East Branch sites are reached from the bridge at Lovers Lane by going downstream 0.5 kilometer to the junction of the West and East branches and following the East Branch upstream. Collecting sites along the river are discovered by partial trails and by wading. The river is treacherous after a rain, and access is limited to low-water stages, usually in summer and fall. Because the septaria are tough, large sledgehammers and chisels are required to open them. Early geologists working along the Huron River first noted the large concretions (Newberry 1870, 1874; Read 1878; Prosser 1913); the vein minerals of the septaria were originally described by Read (1878) and much later by Hyde and Landy (1966) and by Leavens (1968). Organic remains, IN THE LATE DEVONIAN HURON SHALE, NORTH-CENTRAL OHIO