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The AAPG/Datapages Combined Publications Database

Oklahoma City Geological Society


The Shale Shaker
Vol. 68 (2017), No. 1. (January/February), Pages 20-31

Evidence for a Subsurface Ordovician Meteorite Impact Near Ingalls, Oklahoma

Ben Herrmann


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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