The Sugar Grove 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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Sugar Grove’s center stands about 2,600 ft above sea level. Within three miles the land runs from 2,530 ft to 3,750 ft, a difference of 1,220 ft: steep hill country. The highest named summit within 15 miles is Mount Rogers, about 5,720 ft, 11 miles southwest.
Under the town center the state geologic map shows Shady Dolomite (dolostone), from the Cambrian, 487 to 542 million years old.
The section below crosses 10 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 8×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone, quartzite. Age: Cambrian, 487 to 542 million years old. About 9 mi of the line.
Dolostone. Age: Cambrian, 487 to 542 million years old. About 5 mi of the line.
Shale. Age: Cambrian, 487 to 542 million years old. About 2 mi of the line.
Rhyolite. Age: Neoproterozoic, 542 to 1,000 million years old. About 2 mi of the line.
Dolostone, limestone. Age: Cambrian, 487 to 542 million years old. About 2 mi of the line.
Sandstone. Age: Cambrian, 487 to 542 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. 4 smaller units along the line are not listed.
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 Sugar Grove reaches the Gulf of America by way of the South Fork Holston, the Holston, the Tennessee, the Ohio and the Mississippi: about 1,900 river miles.
Lakes on the way: Guntersville Lake, White Lake (historical), Pickwick Lake and South Holston Lake.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Sugar Grove; river miles along the main stem, rounded.
