The Bastrop 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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Bastrop’s center stands about 380 ft above sea level. Within three miles the land runs from 320 ft to 560 ft, a difference of 240 ft: rolling country. The highest named summit within 15 miles is Caldwell Knob, about 590 ft, 9 miles west-northwest.
Under the town center the state geologic map shows Terrace deposits (sand), from the Pleistocene to Holocene, less than 2.6 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 58×. 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. Age: Late Paleocene to Early Eocene, 48 to 59 million years old. About 7 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 6 mi of the line.
Sandstone. Age: Eocene, 34 to 56 million years old. About 5 mi of the line.
Sandstone. Age: Eocene, 34 to 56 million years old. About 3 mi of the line.
Claystone. Age: Late Paleocene to Early Eocene, 48 to 59 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.
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 Bastrop reaches the Gulf of America by way of Gills Branch and the Colorado: about 230 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Bastrop; river miles along the main stem, rounded.
