Pilot Knob is the largest volcano in Texas, located in Austin.
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Despite being dormant for millions of years, it continues to fascinate visitors with its ancient lava flows and volcanic igneous rock.
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The volcano spans over two miles in diameter, making it the largest among the 75 known active volcanoes in Texas.
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It is situated just eight miles south of downtown Austin, close to McKinney Falls State Park.
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The volcano's northern rim features a slope of Cretaceous beach rock known as Dee Gabriel Collins.
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The central core area showcases refractory trap rock, while the lowland area drains into Cottonmouth Creek, carrying remnants of volcanic ash and pyroclastic formations.
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South of Pilot Knob, the trap rock protrudes around 0.3 miles eastward from the intersection of Bluff Springs Road and McKinney Falls Parkway.
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Pilot Knob formed approximately 120 million years ago during the Cretaceous Age, emerging from shallow waters and experiencing volcanic eruptions.
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Visitors can explore the diverse flora and fauna near Pilot Knob, including waterfalls, the ancient "Old Baldy" cypress tree, and various wildlife species