Stratigraphic and Geologic History of the Point Pleasant Formation (Middle Ordovician) of Ohio and Kentucky

Presentation Type

Poster/Portfolio

Presenter Major(s)

Geology

Mentor Information

Patricia Videtich, videticp@gvsu.edu

Department

Geology

Location

Kirkhof Center KC 78

Start Date

13-4-2011 2:00 PM

End Date

13-4-2011 3:00 PM

Keywords

Environment, Physical Science

Abstract

Outcrops of the Middle Ordovician Point Pleasant Formation, composed mostly of argillaceous limestone, calcareous shales and layers of brachiopod coquina, are found in southwestern Ohio and northern Kentucky. The formation is gradationally overlain by the Upper Ordovician Kope Formation and gradationally underlain by the Middle Ordovician Lexington Limestone. Samples were collected near Brooksville and at Lower Holst Creek on Highway 9 in northern Kentucky. Multiple point counts will be done on thin sections of our samples using a petrographic microscope with emphasis on fossil assemblages and deformed calcite grains. We will be searching for crystal plastic deformation structures within the calcite grains consistent with very low temperature deformation to support the hypothesis that the deformation in the Point Pleasant Formation was caused by down slope motion of sediments in a submarine setting.

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Apr 13th, 2:00 PM Apr 13th, 3:00 PM

Stratigraphic and Geologic History of the Point Pleasant Formation (Middle Ordovician) of Ohio and Kentucky

Kirkhof Center KC 78

Outcrops of the Middle Ordovician Point Pleasant Formation, composed mostly of argillaceous limestone, calcareous shales and layers of brachiopod coquina, are found in southwestern Ohio and northern Kentucky. The formation is gradationally overlain by the Upper Ordovician Kope Formation and gradationally underlain by the Middle Ordovician Lexington Limestone. Samples were collected near Brooksville and at Lower Holst Creek on Highway 9 in northern Kentucky. Multiple point counts will be done on thin sections of our samples using a petrographic microscope with emphasis on fossil assemblages and deformed calcite grains. We will be searching for crystal plastic deformation structures within the calcite grains consistent with very low temperature deformation to support the hypothesis that the deformation in the Point Pleasant Formation was caused by down slope motion of sediments in a submarine setting.