The Graham 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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Graham’s center stands about 1,050 ft above sea level. Within three miles the land runs from 1,020 ft to 1,190 ft, a difference of 170 ft: gently rolling country. The highest named summit within 15 miles is Indian Mountain, about 1,470 ft, 10 miles east-southeast.
Under the town center the state geologic map shows Thrifty and Graham Formations, undivided (black-shale), from the Carboniferous, 299 to 324 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 55×. 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: Carboniferous, 299 to 324 million years old. About 19 mi of the line.
Sandstone. Age: Carboniferous to Permian, 252 to 324 million years old. About 5 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 0.6 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 Graham reaches the Gulf of America by way of Salt Creek and the Brazos: about 750 river miles.
Lakes on the way: Possum Kingdom Lake and Lake Granbury.
550 miles of the trip are on the Brazos.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Graham; river miles along the main stem, rounded.
