description Jeptha Knob Overview
Jeptha Knob is a circular geological structure in Shelby County, Kentucky, interpreted by the U.S. Geological Survey as probably resulting from a meteoroid impact. It is about 14,000 feet in diameter and contains an uplifted, brecciated central area surrounded by concentric and radial faults and a down-dropped outer belt. The site is an eroded impact structure rather than a preserved bowl-shaped crater, so its geology is read from displaced and fractured sedimentary rocks.
[USGS report](https://pubs.usgs.gov/pp/p1151h/structure.html).
help Jeptha Knob FAQ
Where is Jeptha Knob?
Jeptha Knob is in Shelby County, Kentucky. It is a circular geological structure with an uplifted, brecciated central area and surrounding concentric features.
How large is Jeptha Knob?
The structure is about 14,000 feet in diameter. That size refers to the circular geological feature interpreted as the likely impact structure.
Is Jeptha Knob definitely a meteorite crater?
The U.S. Geological Survey describes it as probably resulting from a meteoroid impact. The wording reflects an interpretation based on its geology rather than an absolutely confirmed crater diagnosis.
What does brecciated mean at Jeptha Knob?
Brecciated rock is rock broken into angular fragments and then cemented or compacted together. At Jeptha Knob, the uplifted and brecciated central area is part of the evidence for a major shock event.
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