The Smyrna 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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Smyrna’s center stands about 760 ft above sea level. Within three miles the land runs from 530 ft to 770 ft, a difference of 240 ft: rolling country. The highest named summit within 15 miles is Whitaker Mountain, about 1,180 ft, 8 miles northwest.
Under the town center the state geologic map shows Metatonalite, from the Neoproterozoic, 542 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 26×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Metatonalite, granodiorite. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 8 mi of the line.
Metavolcanic. Age: Neoproterozoic, 542 to 1,000 million years old. About 6 mi of the line.
Age: Neoproterozoic, 542 to 1,000 million years old. About 6 mi of the line.
Mica-schist. Age: Neoproterozoic, 542 to 1,000 million years old. About 3 mi of the line.
Metavolcanic. Age: Neoproterozoic, 542 to 1,000 million years old. About 1 mi of the line.
Granite. Age: Carboniferous to Permian, 252 to 359 million years old. About 0.7 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 Smyrna reaches the Atlantic Ocean by way of Guyonmoore Creek, the Broad, the Congaree, the Santee and the South Santee: about 280 river miles.
Lake on the way: Lib Pines Lake.
85 miles of the trip are on the Broad.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Smyrna; river miles along the main stem, rounded.
