The East Duke 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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East Duke’s center stands about 1,420 ft above sea level. Within three miles the land runs from 1,380 ft to 1,470 ft, a difference of 90 ft: gently rolling country.
Under the town center the state geologic map shows Van Vacter Member of Blaine Formation (gypsum, dolostone, shale), from the Permian, 252 to 299 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 55×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Gypsum, dolostone, shale. Age: Permian, 252 to 299 million years old. About 13 mi of the line.
Gypsum, dolostone. Age: Permian, 252 to 299 million years old. About 7 mi of the line.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 3 mi of the line.
Fine-detrital. Age: Holocene, less than 12,000 years old. About 1.0 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 East Duke reaches the Gulf of America by way of Turkey Creek, the Salt Fork Red, the Red River, the Atchafalaya and the Lower Atchafalaya: about 1,150 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of East Duke; river miles along the main stem, rounded.
