The Lumpkin 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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Lumpkin’s center stands about 580 ft above sea level. Within three miles the land runs from 390 ft to 630 ft, a difference of 240 ft: rolling country.
Under the town center the state geologic map shows Eocene and Oligocene Residuum, undifferentiated (sand, clay), from the Eocene to Oligocene, 23 to 56 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 50×. 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: Cretaceous, 66 to 145 million years old. About 10 mi of the line.
Clay, sand. Age: Cretaceous, 66 to 145 million years old. About 8 mi of the line.
Sand, clay. Age: Eocene to Oligocene, 23 to 56 million years old. About 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 Lumpkin reaches the Gulf of America by way of Hodchodkee Creek, Pataula Creek, the Chattahoochee and the Apalachicola: about 230 river miles.
Lake on the way: Walter F George Reservoir.
110 miles of the trip are on the Apalachicola.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lumpkin; river miles along the main stem, rounded.
