Pilot Knob

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Pilot Knob, Extinct volcano in Austin, Texas

The Pilot Knob volcanic complex consists of four rounded hills forming a core area with a diameter spanning two miles in Central Texas.

During the Late Cretaceous period, about 80 million years ago, this volcano formed when magma encountered water-laden sediments in a marine environment.

The elevation of Pilot Knob served as a critical navigation point for early Texas settlers traveling through the region during westward expansion.

Visitors can observe volcanic ash deposits beneath limestone overhangs at both upper and lower falls within McKinney Falls State Park.

The geological formation stands as the largest among 75 former volcanoes in Texas, containing basaltic rocks that enriched the surrounding agricultural soil.

Location: Travis County

GPS coordinates: 30.15876,-97.70810

Latest update: May 27, 2025 08:46

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