The Jackson 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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Jackson’s center stands about 710 ft above sea level. Within three miles the land runs from 610 ft to 770 ft, a difference of 160 ft: gently rolling country. The highest named summit within 15 miles is Barrow Hill, about 1,020 ft, 15 miles west-southwest.
Under the town center the state geologic map shows Biotitic Gneiss / Mica Schist/ Amphibolite (amphibolite, biotite-gneiss, mica-schist), from the Precambrian to Paleozoic.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 42×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Amphibolite, biotite-gneiss, mica-schist. Age: Precambrian to Paleozoic. About 15 mi of the line.
Gneiss, mica-schist, amphibolite. Age: Precambrian to Paleozoic. About 4 mi of the line.
Hornblende-gneiss, amphibolite. Age: Precambrian to Paleozoic. About 2 mi of the line.
Gneiss. Age: Precambrian to Paleozoic. About 2 mi of the line.
Schist. Age: Precambrian to Paleozoic. About 0.9 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 Jackson reaches the Atlantic Ocean by way of Town Branch, Big Sandy Creek, the Ocmulgee and the Altamaha: about 370 river miles.
230 miles of the trip are on the Ocmulgee.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Jackson; river miles along the main stem, rounded.
