The Oconee 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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Oconee’s center stands about 300 ft above sea level. Within three miles the land runs from 200 ft to 440 ft, a difference of 240 ft: rolling country. The highest named summit within 15 miles is Hillhouse Hill, about 460 ft, 13 miles west-northwest.
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 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand. Age: Eocene, 34 to 56 million years old. About 7 mi of the line.
Clay. Age: Eocene, 34 to 56 million years old. About 7 mi of the line.
Sandstone, claystone. Age: Tertiary Neogene, 2.6 to 23 million years old. About 4 mi of the line.
Fine-detrital. Age: Quaternary, less than 2.6 million years old. About 3 mi of the line.
Sand, clay. Age: Cretaceous to Tertiary, 2.6 to 145 million years old. 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 Oconee reaches the Atlantic Ocean by way of Sandy Hill Creek, the Oconee and the Altamaha: about 230 river miles.
130 miles of the trip are on the Altamaha.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Oconee; river miles along the main stem, rounded.
