The Coleman 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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Coleman’s center stands about 770 ft above sea level. Within three miles the land runs from 660 ft to 790 ft, a difference of 130 ft: gently rolling country.
Under the town center the state geologic map shows Antlers Sand or Antlers Sandstone, from the Early Cretaceous, 100 to 145 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 54×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone. Age: Early Cretaceous, 100 to 145 million years old. About 10 mi of the line.
Granite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 4 mi of the line.
Shale. Age: Early Cretaceous, 100 to 145 million years old. About 2 mi of the line.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 2 mi of the line.
Limestone. Age: Early Cretaceous, 100 to 145 million years old. About 2 mi of the line.
Limestone, conglomerate, dolostone. Age: Early Ordovician, 471 to 487 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 Coleman reaches the Gulf of America by way of Sandy Creek, the Blue River, the Red River, the Atchafalaya and the Lower Atchafalaya: about 830 river miles.
610 miles of the trip are on the Red River.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Coleman; river miles along the main stem, rounded.
