Although the Trenton Group of New York State has been studied for more than 150 years, no comprehensive description of its facies patterns has ever been produced. Such a description is presented here. The facies patterns of the Trenton Group reveal that this unit’s deposition was indirectly controlled by the Taconic orogeny then going on in nearby New England.
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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.