The Knob Lick plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.
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Knob Lick’s center stands about 950 ft above sea level. Within three miles the land runs from 800 ft to 1,160 ft, a difference of 360 ft: rolling country. The highest named summit within 15 miles is Brown Mountain, about 1,670 ft, 13 miles west.
Under the town center the state geologic map shows Lamotte Sandstone, from the Cambrian, 487 to 497 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 25×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Alkali-feldspar-granite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 9 mi of the line.
Dolostone, shale, siltstone. Age: Cambrian, 487 to 497 million years old. About 5 mi of the line.
Dolostone. Age: Cambrian, 487 to 497 million years old. About 5 mi of the line.
Sandstone. Age: Cambrian, 487 to 497 million years old. About 3 mi of the line.
Rhyolite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.
Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.
A raindrop that lands in Knob Lick reaches the Gulf of America by way of Musco Creek, the Little Saint Francis, the Saint Francis and the Mississippi: about 1,090 river miles.
690 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Knob Lick; river miles along the main stem, rounded.
