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Pragian to Eifelian strata (middle Lower to lower Middle Devonian), northern Appalachian Basin; stratigraphic nomenclatural changes



Pragian to Eifelian strata (middle Lower to lower Middle Devonian), northern Appalachian Basin; stratigraphic nomenclatural changes



Northeastern Geology and Environmental Sciences 28(1): 80-95



High resolution event and cyclic stratigraphic study of Pragian-, Emsian-and Eifelian-age strata across the Appalachian Basin (New York to southwestern Virginia and Ohio) indicates a need for some changes in stratigraphic nomenclature. Following procedures of the International and North American Stratigraphic codes, new units are proposed, older units are revised, refined, or reinstated, and some units are abandoned (owing to their synonymy). The changes include: 1) abandonment of the Ridgeley Formation as a synonym of the Oriskany Formation; 2) three proposed formal members of the Esopus Formation in New York and eastern Pennsylvania (Spawn Hollow, Quarry Hill and Wiltwyck members); 3) one new member (Gumaer Island Member) in the lower part of the Schoharie Formation, and assignment of the term Carlisle Center as a member-level unit within the Schoharie Formation; 4) assignment of the term "Marcellus" to subgroup status within the classic Hamilton Group of New York, and recognition to two formation-level successions within the Marcellus (Union Springs and Oatka Creek-Mount marion formations, low to high). Upper Marcellus strata are assigned to two laterally equivalent formations, the Oatka Creek (dominated by basinal black shale facies) and the Mount Marion (proximal basin to shoreface shales to sandstones). Two members occur within the Union Springs Formation (Bakoven and Stony Hollow members) and three members occur in the lower part of the overlying Oatka Creek and Mount Marion formations (Hurley, Cherry Valley and East Berne members). Some units are revised or restricted, based on changes in unit boundaries, recognition of multiple lithosomes, or other reasons. Other units are abandoned (e.g., Buttermilk Falls Formation and associated members, eastern Pennsylvania).

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