The Godfrey 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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Godfrey’s center stands about 630 ft above sea level. Within three miles the land runs from 470 ft to 650 ft, a difference of 180 ft: gently rolling country.
Under the town center the state geologic map shows Granite Gneiss/ Amphibolite (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 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.
Gneiss, amphibolite. Age: Precambrian to Paleozoic. About 10 mi of the line.
Biotite-gneiss. Age: Precambrian to Paleozoic. About 5 mi of the line.
Gneiss. Age: Precambrian to Paleozoic. About 3 mi of the line.
Amphibolite, biotite-gneiss, mica-schist. Age: Precambrian to Paleozoic. About 2 mi of the line.
Gneiss. Age: Precambrian to Paleozoic. About 1 mi of the line.
Gneiss. Age: Precambrian to Paleozoic. About 1 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 Godfrey reaches the Atlantic Ocean by way of Big Indian Creek, the Little River, the Oconee and the Altamaha: about 310 river miles.
140 miles of the trip are on the Oconee.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Godfrey; river miles along the main stem, rounded.
