The Siloam 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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Siloam’s center stands about 730 ft above sea level. Within three miles the land runs from 560 ft to 750 ft, a difference of 190 ft: gently rolling country.
Under the town center the state geologic map shows Porphyritic granite, from the Precambrian to Paleozoic.
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 55×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granite. Age: Precambrian to Paleozoic. About 14 mi of the line.
Gneiss, amphibolite. Age: Precambrian to Paleozoic. About 6 mi of the line.
Age: Precambrian to Paleozoic. About 2 mi of the line.
Amphibolite, quartzite, gneiss. Age: Precambrian to Paleozoic. 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.
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 Siloam reaches the Atlantic Ocean by way of Bowden Creek, Beaverdam Creek, Richland Creek, the Oconee and the Altamaha: about 310 river miles.
160 miles of the trip are on the Oconee.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Siloam; river miles along the main stem, rounded.
