The Reagan 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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Reagan’s center stands about 920 ft above sea level. Within three miles the land runs from 840 ft to 1,030 ft, a difference of 190 ft: gently rolling country. The highest named summit within 15 miles is Lookout Mountain, about 1,090 ft, 4 miles northeast.
Under the town center the state geologic map shows Tishomingo and Troy Granites, from the Mesoproterozoic, 1 to 1.6 billion 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 33×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Black-shale. Age: Late Devonian, 359 to 384 million years old. About 6 mi of the line.
Granite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 5 mi of the line.
Limestone, dolostone. Age: Early Ordovician, 471 to 487 million years old. About 4 mi of the line.
Fine-detrital. Age: Holocene, less than 12,000 years old. About 3 mi of the line.
Limestone, conglomerate, dolostone. Age: Early Ordovician, 471 to 487 million years old. About 3 mi of the line.
Sandstone. Age: Early Cretaceous, 100 to 145 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 Reagan reaches the Gulf of America by way of Pennington Creek, the Washita, the Red River, the Atchafalaya and the Lower Atchafalaya: about 860 river miles.
680 miles of the trip are on the Red River.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Reagan; river miles along the main stem, rounded.
