The Rochelle 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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Rochelle’s center stands about 1,780 ft above sea level. Within three miles the land runs from 1,630 ft to 1,890 ft, a difference of 260 ft: rolling country. The highest named summit within 15 miles is Corn Creek Hills, about 1,960 ft, 4 miles north-northwest.
Under the town center the state geologic map shows Antlers Sand (sandstone, claystone), from the Early Cretaceous, 100 to 145 million years old.
The section below crosses 9 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 46×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone, claystone. Age: Early Cretaceous, 100 to 145 million years old. About 11 mi of the line.
Claystone. Age: Carboniferous, 299 to 324 million years old. About 5 mi of the line.
Coarse-detrital, fine-detrital. Age: Quaternary, less than 2.6 million years old. About 3 mi of the line.
Limestone. Age: Carboniferous, 299 to 324 million years old. About 2 mi of the line.
Limestone. Age: Carboniferous, 299 to 324 million years old. About 2 mi of the line.
Black-shale. Age: Carboniferous, 299 to 324 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. 3 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 Rochelle reaches the Gulf of America by way of Little Brady Creek, 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 Rochelle; river miles along the main stem, rounded.
