The Lampasas 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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Lampasas’s center stands about 1,030 ft above sea level. Within three miles the land runs from 980 ft to 1,220 ft, a difference of 240 ft: rolling country. The highest named summit within 15 miles is Knight Mountain, about 1,670 ft, 12 miles west-northwest.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 30×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Conglomerate, sandstone. Age: Early Cretaceous, 100 to 145 million years old. About 11 mi of the line.
Sandstone, claystone. Age: Early Cretaceous, 100 to 145 million years old. About 9 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 2 mi of the line.
Limestone. Age: Carboniferous, 299 to 324 million years old. About 1 mi of the line.
Limestone, shale. Age: Early Cretaceous, 100 to 145 million years old. About 0.6 mi of the line.
Limestone. Age: Devonian to Carboniferous, 324 to 422 million 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. 1 smaller unit 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 Lampasas reaches the Gulf of America by way of Sulphur Creek, the Lampasas, the Little River and the Brazos: about 510 river miles.
Lake on the way: Stillhouse Hollow 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 Lampasas; river miles along the main stem, rounded.
