Depositional Facies and Diagenetic History of the Trenton Limestone in Northern Indiana
Daniel R. Fara, Brian D. Keith, 1988. "Depositional Facies and Diagenetic History of the Trenton Limestone in Northern Indiana", The Trenton Group (Upper Ordovician Series) of Eastern North America: Deposition, Diagenesis, and Petroleum, Brain D. Keith
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The Trenton Limestone consists of skeletal sand and organic buildup facies that were deposited on a carbonate ramp under shallow-water open-marine conditions. Petroleum reservoirs occur in the Trenton only where hydrocarbon entrapment in both structural and stratigraphic traps preserved porosity in a regional dolostone.
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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.