The Megargel 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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Megargel’s center stands about 1,270 ft above sea level. Within three miles the land runs from 1,200 ft to 1,330 ft, a difference of 130 ft: gently rolling country.
Under the town center the state geologic map shows Nocona Formation (claystone), from the Permian, 252 to 299 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 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Claystone. Age: Permian, 252 to 299 million years old. About 10 mi of the line.
Siltstone-mudstone. Age: Permian, 252 to 299 million years old. About 4 mi of the line.
Black-shale. Age: Permian, 252 to 299 million years old. About 3 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 2 mi of the line.
Shale. Age: Permian, 252 to 299 million years old. About 2 mi of the line.
Coarse-detrital, fine-detrital. Age: Quaternary, less than 2.6 million years old. About 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. 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 Megargel reaches the Gulf of America by way of Wagon Branch, Kickapoo Creek, the North Fork Little Wichita, the Little Wichita, the Red River, the Atchafalaya and the Lower Atchafalaya: about 1,100 river miles.
Lakes on the way: Lake Arrowhead and Lake Kickapoo.
830 miles of the trip are on the Red River.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Megargel; river miles along the main stem, rounded.
