The Clarksville 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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21° on Nov. 14, 2019, the coldest reading for this week of the year since 1891. Next is 22° in 1950.
Clarksville’s center stands about 360 ft above sea level. Within three miles the land runs from 290 ft to 440 ft, a difference of 150 ft: gently rolling country.
Under the town center the state geologic map shows Buffalo Granite, from the Proterozoic, 542 to 2,500 million years old.
The section below crosses 7 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.
Granite. Age: Proterozoic, 542 to 2,500 million years old. About 8 mi of the line.
Felsic-volcanic. Age: Neoproterozoic, 542 to 1,000 million years old. About 5 mi of the line.
Phyllite, metasiltstone. Age: Neoproterozoic, 542 to 1,000 million years old. About 5 mi of the line.
Phyllite, slate. Age: Neoproterozoic, 542 to 1,000 million years old. About 2 mi of the line.
Phyllite, metavolcanic. Age: Neoproterozoic, 542 to 1,000 million years old. About 1 mi of the line.
Metabasalt. Age: Neoproterozoic, 542 to 1,000 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. 1 smaller unit 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 Clarksville reaches Albemarle Sound and the Atlantic Ocean by way of Blue Creek and the Roanoke: about 200 river miles.
Lake on the way: Roanoke Rapids Lake.
130 miles of the trip are on the Roanoke.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Clarksville; river miles along the main stem, rounded.
Clarksville has a humid subtropical climate. Summer afternoons average 90° in July; winter nights fall to about 28° in January. About 46 inches of rain fall in a normal year, with about 4 inches of snow.
Normals 1991–2020 and records since 1891 at Clarksville, here. NOAA, through RCC-ACIS.
