The Shellman 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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Shellman’s center stands about 400 ft above sea level. Within three miles the land runs from 300 ft to 450 ft, a difference of 150 ft: gently rolling country.
Under the town center the state geologic map shows Eocene and Oligocene Residuum, undifferentiated (sand, clay), from the Eocene to Oligocene, 23 to 56 million years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 58×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand, clay. Age: Eocene to Oligocene, 23 to 56 million years old. About 14 mi of the line.
Sandstone, shale. Age: Eocene, 34 to 56 million years old. About 8 mi of the line.
Sand. Age: Paleocene, 56 to 66 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 Shellman reaches the Gulf of America by way of Ichawaynochaway Creek, the Flint and the Apalachicola: about 220 river miles.
110 miles of the trip are on the Apalachicola.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Shellman; river miles along the main stem, rounded.
