The Boykin 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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Boykin’s center stands about 140 ft above sea level. Within three miles the land runs from 70 ft to 220 ft, a difference of 150 ft: gently rolling country. The highest named summit within 15 miles is Wildcat Hill, about 480 ft, 13 miles east.
Under the town center the state geologic map shows Selma Group; Prairie Bluff Chalk (chalk, clay), from the Cretaceous, 66 to 145 million years old.
The section below crosses 9 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 52×. 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, sandstone. Age: Cretaceous, 66 to 145 million years old. About 7 mi of the line.
Clay, sand. Age: Paleocene, 56 to 66 million years old. About 5 mi of the line.
Sand. Age: Holocene, less than 12,000 years old. About 3 mi of the line.
Chalk. Age: Cretaceous, 66 to 145 million years old. About 2 mi of the line.
Chalk, clay. Age: Cretaceous, 66 to 145 million years old. About 2 mi of the line.
Sand, clay. Age: Paleocene, 56 to 66 million years old. About 2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 3 smaller units along the line are not listed.
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 Boykin reaches Mobile Bay and the Gulf of America by way of the Alabama and the Mobile: about 200 river miles.
150 miles of the trip are on the Alabama.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Boykin; river miles along the main stem, rounded.
