The Plum Branch 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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Plum Branch’s center stands about 460 ft above sea level. Within three miles the land runs from 310 ft to 510 ft, a difference of 200 ft: gently rolling country. The highest named summit within 15 miles is Boles Mountain, about 660 ft, 14 miles east-northeast.
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 6 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.
Metavolcanic. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 13 mi of the line.
Mica-schist. Age: Precambrian to Paleozoic. About 3 mi of the line.
Metagranite. Age: Neoproterozoic to Devonian, 359 to 1,000 million years old. About 2 mi of the line.
Gabbro. Age: Silurian to Devonian, 359 to 445 million years old. About 1 mi of the line.
Mica-schist. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 0.8 mi of the line.
Slate. Age: Middle Cambrian to Ordovician, 445 to 521 million years old. About 0.6 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.
A raindrop that lands in Plum Branch reaches the Atlantic Ocean by way of Benningsfield Creek and the Savannah: about 240 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Plum Branch; river miles along the main stem, rounded.
