The San Felipe 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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San Felipe’s center stands about 160 ft above sea level. Within three miles the land runs from 90 ft to 200 ft, a difference of 110 ft: gently rolling country.
Under the town center the state geologic map shows Lissie Formation (silt, sand, clay), 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.
Coarse-detrital, fine-detrital. Age: Pliocene, 2.6 to 5.3 million years old. About 10 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 7 mi of the line.
Silt, sand, clay. Age: Pleistocene, less than 2.6 million years old. About 6 mi of the line.
Clay, silt. Age: Pleistocene, less than 2.6 million years old. About 0.6 mi of the line.
Sand. Age: Pleistocene, less than 2.6 million years old. About 0.6 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 San Felipe reaches the Gulf of America by way of Bullinger Creek and the Brazos: about 150 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of San Felipe; river miles along the main stem, rounded.
