The Swink 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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Swink’s center stands about 500 ft above sea level. Within three miles the land runs from 420 ft to 590 ft, a difference of 170 ft: gently rolling country. The highest named summit within 15 miles is Bull Mountain, about 840 ft, 8 miles north-northwest.
Under the town center the state geologic map shows Kiamichi Formation (shale), from the Early Cretaceous, 100 to 145 million years old.
The section below crosses 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 51×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone. Age: Early Cretaceous, 100 to 145 million years old. About 8 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 6 mi of the line.
Shale. Age: Early Cretaceous, 100 to 145 million years old. About 3 mi of the line.
Limestone, shale, marlstone. Age: Early Cretaceous, 100 to 145 million years old. About 3 mi of the line.
Sandstone. Age: Carboniferous, 299 to 324 million years old. About 2 mi of the line.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 0.9 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 2 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 Swink reaches the Gulf of America by way of Doaksville Creek, the Red River, the Atchafalaya and the Lower Atchafalaya: about 690 river miles.
550 miles of the trip are on the Red River.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Swink; river miles along the main stem, rounded.
