The Brady 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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Brady’s center stands about 1,680 ft above sea level. Within three miles the land runs from 1,650 ft to 1,820 ft, a difference of 170 ft: gently rolling country. The highest named summit within 15 miles is Rattlesnake Point, about 1,980 ft, 15 miles northwest.
Under the town center the state geologic map shows Cedarton Shale and Adams Branch Limestone, undivided (black-shale), from the Carboniferous, 299 to 324 million years old.
The section below crosses 14 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 40×. 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. Age: Early Cretaceous, 100 to 113 million years old. About 4 mi of the line.
Sandstone, claystone. Age: Early Cretaceous, 100 to 145 million years old. About 4 mi of the line.
Dolostone, limestone. Age: Early Ordovician, 471 to 487 million years old. About 4 mi of the line.
Limestone, dolostone. Age: Cambrian to Early Ordovician, 471 to 497 million years old. About 3 mi of the line.
Coarse-detrital, fine-detrital. Age: Quaternary, 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 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. 8 smaller units 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 Brady reaches the Gulf of America by way of Brady Creek, the San Saba and the Colorado: about 540 river miles.
Lakes on the way: Buchanan Lake, Lake Marble Falls and Lake Lyndon B Johnson.
320 miles of the trip are on the Colorado.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Brady; river miles along the main stem, rounded.
