Deposition in the Oxygen-Deficient Taconic Foreland Basin, Late Ordovician
Bernward Josef Hay, John L. Cisne, 1988. "Deposition in the Oxygen-Deficient Taconic Foreland Basin, Late Ordovician", The Trenton Group (Upper Ordovician Series) of Eastern North America: Deposition, Diagenesis, and Petroleum, Brain D. Keith
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The Taconic Foreland Basin formed during the collision between the North American craton and the Ammonoosuc Arc, approaching from the east. Oxygen-depleted conditions in the basin were probably caused by density stratification in the water column due to a locally humid climate, in combination with stagnant conditions in the world ocean. A long-term cyclicity of alternating 500,000 to 1,000,000 year long “anaerobic phases” and “dysaerobic phases” appears to be the result of a combination of variations in the sedimentation rate, climatic conditions, and changes in the world ocean.
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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.