The Seaman 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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Seaman’s center stands about 900 ft above sea level. Within three miles the land runs from 680 ft to 980 ft, a difference of 300 ft: rolling country. The highest named summit within 15 miles is Fort Hill, about 1,340 ft, 15 miles northeast.
Under the town center the state geologic map shows Estill Shale, from the Silurian, 422 to 445 million years old.
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 38×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale, limestone, dolostone. Age: Late Ordovician, 445 to 454 million years old. About 11 mi of the line.
Shale. Age: Silurian, 422 to 445 million years old. About 7 mi of the line.
Dolostone. Age: Silurian, 425 to 434 million years old. About 4 mi of the line.
Limestone, shale. Age: Silurian, 422 to 445 million years old. About 3 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 Seaman reaches the Gulf of America by way of the Cherry Fork, Ohio Brush Creek, the Ohio and the Mississippi: about 1,590 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 Seaman; river miles along the main stem, rounded.
