The East Griffin 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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East Griffin’s center stands about 900 ft above sea level. Within three miles the land runs from 750 ft to 990 ft, a difference of 240 ft: rolling country.
Under the town center the state geologic map shows Mica Schist/ Gneiss/ Amphibolite (gneiss, mica-schist, amphibolite), from the Precambrian to Paleozoic.
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.
Amphibolite, biotite-gneiss, mica-schist. Age: Precambrian to Paleozoic. About 11 mi of the line.
Granite. Age: Precambrian to Paleozoic. About 8 mi of the line.
Gneiss, mica-schist, amphibolite. Age: Precambrian to Paleozoic. 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.
East Griffin straddles the Eastern Continental Divide. Rain on the south side runs to the Gulf of America; most of the rest goes to the Atlantic Ocean.
From the center of town, a raindrop reaches the Atlantic Ocean by way of Cabin Creek, the Towaliga, the Ocmulgee and the Altamaha: about 390 river miles. One that lands on the south side reaches the Gulf of America by way of Grape Creek, Potato Creek, the Flint and the Apalachicola: about 400 river miles.
220 miles of the trip are on the Ocmulgee.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of East Griffin; river miles along the main stem, rounded.
