The Four Corners 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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Four Corners’s center stands about 100 ft above sea level. Within three miles the land runs from 70 ft to 110 ft, a difference of 40 ft: nearly flat ground.
Under the town center the state geologic map shows Beaumont Formation, areas predominantly clay (clay, silt), from the Pleistocene, less than 2.6 million years old.
The section below crosses 4 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.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 10 mi of the line.
Silt, sand, clay. Age: Pleistocene, less than 2.6 million years old. About 5 mi of the line.
Clay, silt. Age: Pleistocene, less than 2.6 million years old. About 3 mi of the line.
Sand. Age: Pleistocene, less than 2.6 million years old. About 3 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 Four Corners reaches Galveston Bay and the Gulf of America by way of Keegans Bayou, Brays Bayou and Buffalo Bayou: about 45 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Four Corners; river miles along the main stem, rounded.
