The Elrod 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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Elrod’s center stands about 970 ft above sea level. Within three miles the land runs from 880 ft to 1,060 ft, a difference of 180 ft: gently rolling country.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 33×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Limestone, shale. Age: Ordovician, 445 to 487 million years old. About 9 mi of the line.
Limestone, shale. Age: Ordovician, 445 to 487 million years old. About 8 mi of the line.
Limestone. Age: Silurian, 422 to 445 million years old. About 5 mi of the line.
Shale. Age: Ordovician, 445 to 487 million years old. About 2 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 Elrod reaches the Gulf of America by way of Caesar Creek, Laughery Creek, the Ohio and the Mississippi: about 1,480 river miles.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Elrod; river miles along the main stem, rounded.
