The Windthorst 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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Windthorst’s center stands about 1,020 ft above sea level. Within three miles the land runs from 950 ft to 1,080 ft, a difference of 130 ft: gently rolling country. The highest named summit within 15 miles is Bare Mountain, about 1,200 ft, 14 miles south.
Under the town center the state geologic map shows Archer City Formation (black-shale), from the Permian, 252 to 299 million years old.
The section below crosses 2 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Black-shale. Age: Permian, 252 to 299 million years old. About 23 mi of the line.
Claystone. Age: Permian, 252 to 299 million years old. About 0.7 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 Windthorst reaches the Gulf of America by way of East Little Post Oak Creek, the Little Wichita, the Red River, the Atchafalaya and the Lower Atchafalaya: about 1,040 river miles.
Lake on the way: Lake Arrowhead.
830 miles of the trip are on the Red River.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Windthorst; river miles along the main stem, rounded.
