The Cranfills Gap 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.
Cranfills Gap’s center stands about 1,110 ft above sea level. Within three miles the land runs from 880 ft to 1,220 ft, a difference of 340 ft: rolling country. The highest named summit within 15 miles is Long Point, about 1,370 ft, 12 miles west-northwest.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 37×. 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, shale. Age: Early Cretaceous, 100 to 145 million years old. About 13 mi of the line.
Claystone. Age: Early Cretaceous, 100 to 145 million years old. About 7 mi of the line.
Sandstone, claystone. Age: Early Cretaceous, 100 to 145 million years old. About 3 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 0.6 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 0.5 mi of the line.
Limestone, marl. Age: Early Cretaceous, 100 to 145 million years old. About 0.4 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 Cranfills Gap reaches the Gulf of America by way of Austin Branch, Meridian Creek, the North Bosque, the South Bosque and the Brazos: about 480 river miles.
Lake on the way: Waco Lake.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Cranfills Gap; river miles along the main stem, rounded.