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The AAPG/Datapages Combined Publications Database
Oklahoma City Geological Society
Abstract
Evidence for a Subsurface Ordovician Meteorite Impact Near Ingalls, Oklahoma
Abstract
The Ingalls structure is a subsurface structural feature in Payne County, Oklahoma, having anomalously thick Hunton Group limestones. Ingalls structure has circular geometry and an apparent Ordovician age. A petrographic study of well cuttings from the Ingalls structure shows that some quartz grains have several features formed by shock metamorphism. Shock metamorphic features and the presence of what is interpreted as a central uplift in the core of the Ingalls structure strongly support adding the Ingalls structure to the list of known impact craters on Earth
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