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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Kalahari Desert (1)
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North Africa
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Egypt (1)
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Southern Africa
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Primary terms
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Newton County Quarry
Impact geology: Central uplift, Kentland impact structure, Newton County Stone (Kentland) Quarry, Indiana, USA
ABSTRACT This field guide summarizes the main known and unknown aspects of the impact geology of the Kentland impact structure, and includes sections on results from recent research, evidence of impact, age of impact, and shock metamorphism. It is intended to lead visitors through the spectacular, three-dimensional outcrops in the central uplift of the structure, exposed in the Newton County Stone (Kentland) Quarry, western Indiana.
“…the frustration of discovering an unusually good exposure or feature only to have it quarried or covered in succeeding weeks is disheartening. On the other hand, quarry advance enables one to project the geology from time to time, which helps one to fill in the three-dimensional puzzle.” — Gutschick (1972) ABSTRACT We summarize and then build on the three decades of geological mapping and analyses done by Ray Gutschick at the Newton County (Kentland) quarry. We present our own new data and ideas on the kinematics and significance of radial faults, shock metamorphism, petrography and diagenesis of impact breccia dikes, impactite geochemistry, and a preliminary new paleomagnetically determined Jurassic age for the crater. We list and describe the stops for this field excursion.