The South Toledo Bend 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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South Toledo Bend’s center stands about 170 ft above sea level. Within three miles the land runs from 120 ft to 370 ft, a difference of 250 ft: rolling country. The highest named summit within 15 miles is Twin Hills, about 510 ft, 14 miles west.
Under the town center the state geologic map shows Catahoula Formation (mudstone, sand), from the Oligocene, 23 to 34 million years old.
The section below crosses 9 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 42×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Mudstone, sand. Age: Oligocene, 23 to 34 million years old. About 5 mi of the line.
Siltstone, sandstone, clay. Age: Miocene, 5.3 to 23 million years old. About 5 mi of the line.
Coarse-detrital, fine-detrital. Age: Pliocene, 2.6 to 5.3 million years old. About 5 mi of the line.
Clay, sandstone. Age: Miocene, 5.3 to 23 million years old. About 4 mi of the line.
Coarse-detrital, fine-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 3 mi of the line.
Clay, silt, sand. Age: Pleistocene, less than 2.6 million years old. About 1 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 3 smaller units along the line are not listed.
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 South Toledo Bend reaches the Gulf of America by way of Toledo Bend Reservoir and the Sabine: about 170 river miles.
Lakes on the way: Toledo Bend Reservoir and Sabine Lake.
140 miles of the trip are on the Sabine.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of South Toledo Bend; river miles along the main stem, rounded.
