The Lamkin 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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Lamkin’s center stands about 1,060 ft above sea level. Within three miles the land runs from 1,030 ft to 1,300 ft, a difference of 270 ft: rolling country. The highest named summit within 15 miles is Cowhouse Mountain, about 1,670 ft, 13 miles west-southwest.
Under the town center the state geologic map shows Twin Mountains Formation (claystone, sandstone), from the Early Cretaceous, 100 to 145 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 43×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Limestone, shale. Age: Early Cretaceous, 100 to 145 million years old. About 8 mi of the line.
Sandstone, claystone. Age: Early Cretaceous, 100 to 145 million years old. About 8 mi of the line.
Limestone, marlstone. Age: Early Cretaceous, 100 to 145 million years old. About 4 mi of the line.
Claystone, sandstone. Age: Early Cretaceous, 100 to 145 million years old. About 2 mi of the line.
Sandstone. Age: Early Cretaceous, 100 to 145 million years old. About 1 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 0.9 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 Lamkin reaches the Gulf of America by way of the Leon, the Little River and the Brazos: about 600 river miles.
Lake on the way: Belton Lake.
320 miles of the trip are on the Brazos.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lamkin; river miles along the main stem, rounded.
