The Thrall 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.
Chance of showers
Showers likely; cooler
Mostly cloudy
Mostly sunny; warmer
Mostly cloudy
Partly cloudy
Partly cloudy
Thrall’s center stands about 560 ft above sea level. Within three miles the land runs from 450 ft to 580 ft, a difference of 130 ft: gently rolling country.
Under the town center the state geologic map shows High gravel deposits, from the Pleistocene, 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 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Gravel. Age: Pleistocene, less than 2.6 million years old. About 14 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 3 mi of the line.
Clay, sand. Age: Paleocene to Eocene, 34 to 66 million years old. About 3 mi of the line.
Clay, siltstone-mudstone. Age: Late Cretaceous, 66 to 100 million years old. About 3 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 million 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 Thrall reaches the Gulf of America by way of Long Branch, Brushy Creek, the San Gabriel, the Little River and the Brazos: about 390 river miles.
320 miles of the trip are on the Brazos.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Thrall; river miles along the main stem, rounded.
