The Underwood 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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Underwood’s center stands about 630 ft above sea level. Within three miles the land runs from 540 ft to 880 ft, a difference of 340 ft: rolling country. The highest named summit within 15 miles is Silver Hills, about 1,030 ft, 4 miles southwest.
Under the town center the state geologic map shows Borden Group (siltstone), from the Carboniferous, 324 to 359 million years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 40×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Siltstone. Age: Carboniferous, 324 to 359 million years old. About 17 mi of the line.
Black-shale. Age: Devonian to Carboniferous, 324 to 422 million years old. About 6 mi of the line.
Limestone, dolostone. Age: Devonian, 359 to 422 million 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 Underwood reaches the Gulf of America by way of Silver Creek, the Ohio and the Mississippi: about 1,370 river miles.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Underwood; river miles along the main stem, rounded.
