The Dumas 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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Dumas’s center stands about 620 ft above sea level. Within three miles the land runs from 430 ft to 670 ft, a difference of 240 ft: rolling country. The highest named summit within 15 miles is Lebanon Mountain, about 800 ft, 8 miles southeast.
Under the town center the state geologic map shows Ripley formation (sand, clay, limestone), from the Late Cretaceous, 66 to 100 million years old.
The section below crosses 2 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 59×. 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, limestone. Age: Late Cretaceous, 66 to 100 million years old. About 20 mi of the line.
Sand, clay. Age: Late Cretaceous, 66 to 100 million years old. About 4 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 Dumas reaches the Gulf of America by way of Clear Creek, the Hatchie, Porters Creek, Cypress Creek and the Mississippi: about 1,000 river miles.
800 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Dumas; river miles along the main stem, rounded.
