The Mount Croghan 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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Mount Croghan’s center stands about 450 ft above sea level. Within three miles the land runs from 290 ft to 490 ft, a difference of 200 ft: rolling country. The highest named summit within 15 miles is Gordon Mountain, about 630 ft, 10 miles north.
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 41×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Slate. Age: Middle Cambrian to Ordovician, 445 to 521 million years old. About 7 mi of the line.
Metavolcanic. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 7 mi of the line.
Clay, sand. Age: Late Cretaceous, 66 to 72 million years old. About 4 mi of the line.
Slate, argillite. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 3 mi of the line.
Metasiltstone. Age: Cambrian to Ordovician, 445 to 497 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. 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 Mount Croghan reaches the Atlantic Ocean by way of Deep Creek, Thompson Creek, the Great Pee Dee, Schooner Creek and the Waccamaw: about 200 river miles.
150 miles of the trip are on the Great Pee Dee.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Mount Croghan; river miles along the main stem, rounded.
