The Glen Allen 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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Glen Allen’s center stands about 460 ft above sea level. Within three miles the land runs from 420 ft to 750 ft, a difference of 330 ft: rolling country. The highest named summit within 15 miles is Cottoner Mountain, about 1,250 ft, 14 miles northwest.
Under the town center the state geologic map shows Roubidoux Formation (sandstone, chert), from the Early Ordovician, 471 to 487 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 36×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Dolostone. Age: Early Ordovician, 471 to 487 million years old. About 10 mi of the line.
Dolostone. Age: Early Ordovician, 471 to 487 million years old. About 7 mi of the line.
Sandstone, chert. Age: Early Ordovician, 471 to 487 million years old. About 6 mi of the line.
Clay, silt, sand. Age: Holocene, less than 12,000 years old. About 0.6 mi of the line.
Dolostone. Age: Cambrian, 487 to 497 million years old. About 0.5 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 Glen Allen reaches the Gulf of America by way of Little Crooked Creek, Crooked Creek, the Castor River Diversion Channel and the Mississippi: about 1,070 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Glen Allen; river miles along the main stem, rounded.
