The Brent 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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Brent’s center stands about 250 ft above sea level. Within three miles the land runs from 200 ft to 430 ft, a difference of 230 ft: rolling country. The highest named summit within 15 miles is Soap Hill, about 660 ft, 8 miles east.
Under the town center the state geologic map shows Tuscaloosa Group; Coker Formation (sand, clay), from the Cretaceous, 66 to 145 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.
Sand, clay. Age: Cretaceous, 66 to 145 million years old. About 16 mi of the line.
Sand. Age: Holocene, less than 12,000 years old. About 6 mi of the line.
Sand, clay. Age: Cretaceous, 66 to 145 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 Brent reaches Mobile Bay and the Gulf of America by way of Haysop Creek, Congo Creek, the Cahaba, the Alabama and the Mobile: about 330 river miles.
200 miles of the trip are on the Alabama.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Brent; river miles along the main stem, rounded.
