The La Grange 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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La Grange’s center stands about 310 ft above sea level. Within three miles the land runs from 230 ft to 470 ft, a difference of 240 ft: rolling country. The highest named summit within 15 miles is Hellers Hill, about 560 ft, 10 miles north-northeast.
Under the town center the state geologic map shows Catahoula Formation (mudstone, sand), from the Oligocene, 23 to 34 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 61×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Mudstone, sand. Age: Oligocene, 23 to 34 million years old. About 12 mi of the line.
Sandstone, clay. Age: Miocene, 5.3 to 23 million years old. About 8 mi of the line.
Clay, sandstone. Age: Miocene, 5.3 to 23 million years old. About 2 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 2 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 0.7 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 La Grange reaches the Gulf of America by way of the Colorado: about 170 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of La Grange; river miles along the main stem, rounded.
