The Yellow Bluff 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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Yellow Bluff’s center stands about 110 ft above sea level. Within three miles the land runs from 30 ft to 230 ft, a difference of 200 ft: gently rolling country. The highest named summit within 15 miles is Grumpton Hills, about 460 ft, 12 miles east.
Under the town center the state geologic map shows Alluvial, coastal and low terrace deposits (sand), from the Holocene, less than 12,000 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 59×. 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: Holocene, less than 12,000 years old. About 13 mi of the line.
Silt, clay. Age: Paleocene, 56 to 66 million years old. About 8 mi of the line.
Limestone. Age: Paleocene, 56 to 66 million years old. About 1 mi of the line.
Clay, sand. Age: Eocene, 34 to 56 million years old. About 1.0 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 Yellow Bluff reaches Mobile Bay and the Gulf of America by way of Dunns Creek, the Alabama and the Mobile: about 180 river miles.
120 miles of the trip are on the Alabama.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Yellow Bluff; river miles along the main stem, rounded.
