The Jefferson 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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Jefferson’s center stands about 410 ft above sea level. Within three miles the land runs from 310 ft to 550 ft, a difference of 240 ft: rolling country. The highest named summit within 15 miles is Forty Acre Rock, about 640 ft, 8 miles west.
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 45×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Clay, sand. Age: Late Cretaceous, 66 to 72 million years old. About 18 mi of the line.
Slate. Age: Middle Cambrian to Ordovician, 445 to 521 million years old. About 2 mi of the line.
Metasiltstone. Age: Cambrian to Ordovician, 445 to 497 million years old. About 2 mi of the line.
Metavolcanic. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 2 mi of the line.
Conglomerate, sandstone, mudstone. Age: Triassic, 202 to 252 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 Jefferson reaches the Atlantic Ocean by way of Fork Creek, the Lynches, Clark Creek, the Great Pee Dee, Schooner Creek and the Waccamaw: about 210 river miles.
150 miles of the trip are on the Lynches.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Jefferson; river miles along the main stem, rounded.
