The Putnam 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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Putnam’s center stands about 210 ft above sea level. Within three miles the land runs from 50 ft to 250 ft, a difference of 200 ft: rolling country. The highest named summit within 15 miles is Lingo Mountain, about 460 ft, 15 miles west-northwest.
Under the town center the state geologic map shows High terrace deposits (sand), from the Pleistocene, less than 2.6 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 47×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Silt, clay. Age: Paleocene, 56 to 66 million years old. About 12 mi of the line.
Sand. Age: Holocene, less than 12,000 years old. About 6 mi of the line.
Clay, sand. Age: Eocene, 34 to 56 million years old. About 3 mi of the line.
Claystone. Age: Eocene, 34 to 56 million years old. About 1 mi of the line.
Sand. Age: Pleistocene, less than 2.6 million years old. About 1 mi of the line.
Sand. Age: Eocene, 34 to 56 million years old. About 0.2 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 Putnam reaches Mobile Bay and the Gulf of America by way of the Tombigbee and the Mobile: about 150 river miles.
110 miles of the trip are on the Tombigbee.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Putnam; river miles along the main stem, rounded.
