The Hogansville 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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Hogansville’s center stands about 720 ft above sea level. Within three miles the land runs from 680 ft to 890 ft, a difference of 210 ft: rolling country. The highest named summit within 15 miles is Dunbar Mountain, about 900 ft, 5 miles north.
Under the town center the state geologic map shows Hornblende Gneiss/ Amphibolite (hornblende-gneiss, amphibolite), from the Precambrian to Paleozoic.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 62×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Hornblende-gneiss, amphibolite. Age: Precambrian to Paleozoic. About 8 mi of the line.
Mica-schist. Age: Precambrian to Paleozoic. About 6 mi of the line.
Amphibolite, biotite-gneiss, mica-schist. Age: Precambrian to Paleozoic. About 5 mi of the line.
Gneiss, mica-schist, amphibolite. Age: Precambrian to Paleozoic. About 3 mi of the line.
Biotite-gneiss. Age: Precambrian to Paleozoic. About 1 mi of the line.
Gneiss, granite. Age: Precambrian to Paleozoic. About 0.5 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit 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 Hogansville reaches the Gulf of America by way of Yellowjacket Creek, the Chattahoochee and the Apalachicola: about 330 river miles.
Lakes on the way: Walter F George Reservoir, West Point Lake and Bartletts Ferry Lake.
110 miles of the trip are on the Apalachicola.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hogansville; river miles along the main stem, rounded.
