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Structural Elements of Northeastern Appalachians

1957; American Association of Petroleum Geologists; Volume: 41; Linguagem: Inglês

10.1306/0bda5906-16bd-11d7-8645000102c1865d

1558-9153

Herbert P. Woodward,

Geological Studies and Exploration

structures of central and east-central Pennsylvania include elements assigned to three epochs of folding--Taconic structures, dated in the late Ordovician; Acadian structures dated in the late Devonian; and folds of the terminal Paleozoic orogeny. Folds of the two older patterns can be traced northeastward from Susquehanna River through northwestern New Jersey and southeastern New York to Kingston on the Hudson and thence northward along the Hudson Valley toward Lake Champlain. The strike of the youngest Paleozoic folds does not follow this familiar pattern; instead, folds assigned to the so-called revolution extend generally east from the Susquehanna to the Hudson, crossing Delaware River between Hancock and Port Jervis, New York, and passing across the high Catskill Plateau. The trend of these late folds is essentially east-west where they cross the little folded mountains of the familiar Catskill-Kingston region; these small folds are entirely of Acadian age. In following this easterly trend, the terminal Paleozoic folds converge toward and cross structural patterns produced by the Taconic and Acadian orogenies and are themselves interrupted by the Lackawanna syncline or northern anthracite basin. It is believed that the strong northeast trend of the Lackawanna basin has Triassic dating; that the west border of this unusual structure is controlled by Triassic faulting; and that many matters previously regarded as arising from Paleozoic deformation are better assigned to the Triassic. It is suggested that the Green Pond syncline of New Jersey as well as the dominant course of Kittatinny Mountain from Delaware Watergap northeastward are both determined by Acadian rather than Appalachian folding.