Middle and Late Ordovician Shelf Activation and Foredeep Evolution, Central Appalachian Orogen
Gary G. Lash, 1988. "Middle and Late Ordovician Shelf Activation and Foredeep Evolution, Central Appalachian Orogen", The Trenton Group (Upper Ordovician Series) of Eastern North America: Deposition, Diagenesis, and Petroleum, Brain D. Keith
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Early Paleozoic foredeep evolution in the central Appalachian orogen can be described in terms of five stages: (1) Stable Shelf, (2) Initial Uplift of Shelf, (3) Shelf Exposure, (4) Collapse of Peripheral Bulge, and (5) Basin Fill. In addition, strike-parallel variations in central Appalachian foredeep stratigraphy reflect collision along the irregular, early Paleozoic North American continental margin.
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The Trenton Group (Upper Ordovician Series) of Eastern North America: Deposition, Diagenesis, and Petroleum
Regional facies for the Upper Ordovician Series (global classification) of eastern North America consist of clean (pure) carbonates, mixed carbonates and terrigenous clastics, shale, terrigenous clastics coarser than shale, and terrigenous clastics prograding over carbonates. The last facies is characteristic of the Upper Ordovician. Maps and cross sections for stages of the Upper Ordovician demonstrate the influence of regional tectonic events on the sedimentation pattern of these facies.