The Smithville 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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Smithville’s center stands about 340 ft above sea level. Within three miles the land runs from 280 ft to 490 ft, a difference of 210 ft: rolling country. The highest named summit within 15 miles is High Point, about 580 ft, 11 miles west-southwest.
Under the town center the state geologic map shows Terrace deposits (sand), from the Pleistocene to Holocene, less than 2.6 million years old.
The section below crosses 9 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 61×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 8 mi of the line.
Sandstone. Age: Eocene, 34 to 56 million years old. About 4 mi of the line.
Claystone, sandstone. Age: Eocene, 34 to 56 million years old. About 3 mi of the line.
Sandstone. Age: Eocene, 34 to 56 million years old. About 2 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 2 mi of the line.
Claystone, sandstone. Age: Eocene, 34 to 56 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. 3 smaller units along the line are not listed.
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 Smithville reaches the Gulf of America by way of Willow Creek and the Colorado: about 210 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Smithville; river miles along the main stem, rounded.
