The Elgin 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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Elgin’s center stands about 610 ft above sea level. Within three miles the land runs from 490 ft to 680 ft, a difference of 190 ft: gently rolling country.
Under the town center the state geologic map shows Persimmon Fork Formation (metavolcanic), from the Neoproterozoic to Cambrian, 487 to 1,000 million years old.
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 56×. 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 20 mi of the line.
Metagranite. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 2 mi of the line.
Age: Carboniferous to Permian, 252 to 359 million years old. About 1 mi of the line.
Metasiltstone. Age: Cambrian to Ordovician, 445 to 497 million years old. 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.
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 Elgin reaches the Atlantic Ocean by way of Turkey Quarter Creek, Bear Creek, Cane Creek, the Catawba, the Wateree, the Congaree, the Santee and the South Santee: about 260 river miles.
Lake on the way: Lib Pines Lake.
90 miles of the trip are on the Wateree.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Elgin; river miles along the main stem, rounded.
