The McLean 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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McLean’s center stands about 2,860 ft above sea level. Within three miles the land runs from 2,750 ft to 2,930 ft, a difference of 180 ft: gently rolling country.
Under the town center the state geologic map shows Ogallala Formation (sand), from the Late Miocene to Pliocene, 2.6 to 12 million years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 28×. 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. Age: Late Miocene to Pliocene, 2.6 to 12 million years old. About 16 mi of the line.
Sandstone-mudstone. Age: Permian, 252 to 299 million years old. About 7 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 0.5 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 McLean reaches the Gulf of America by way of South Long Dry Creek, Long Dry Creek, Elm Creek, the Elm Fork Red, the North Fork Red, the Red River, the Atchafalaya and the Lower Atchafalaya: about 1,310 river miles.
960 miles of the trip are on the Red River.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of McLean; river miles along the main stem, rounded.
