The Edgefield 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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4.23 inches of rain fell in two days, the most for this week of the year since records began in 1893. The next wettest, 3.75 inches, fell in 1992.
Edgefield’s center stands about 510 ft above sea level. Within three miles the land runs from 410 ft to 650 ft, a difference of 240 ft: rolling country.
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 47×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Metavolcanic. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 8 mi of the line.
Paragneiss. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 7 mi of the line.
Mylonite. Age: Carboniferous to Permian, 252 to 359 million years old. About 5 mi of the line.
Metasiltstone, metasandstone. Age: Middle Cambrian, 497 to 521 million years old. About 3 mi of the line.
Granite. Age: Carboniferous to Permian, 252 to 359 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 Edgefield reaches the Atlantic Ocean by way of Beaverdam Creek, Turkey Creek, Stevens Creek and the Savannah: about 250 river miles.
200 miles of the trip are on the Savannah.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Edgefield; river miles along the main stem, rounded.
Edgefield has a cold desert climate. Summer afternoons average 94° in July; winter nights fall to about 32° in January. Barely 0.0 inches of rain fall in a normal year.
On November 14 Edgefield normally reaches 67° and falls to 41°. The record high is 84°, in 1993; the record low 20°, in 1987. The most rain on this date, 1.10 in, fell in 1983.
Normals 1991–2020 and records since 1893 from the Aiken Area threaded record (Aiken 2 E, 21 miles southeast). NOAA, through RCC-ACIS.
