The Selma 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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21° on Nov. 14, 2018, the coldest reading for this week of the year since 1948. Next is 25° in 1969.
Selma’s center stands about 760 ft above sea level. Within three miles the land runs from 710 ft to 930 ft, a difference of 220 ft: rolling country. The highest named summit within 15 miles is Vogels Peak, about 1,360 ft, 12 miles north-northwest.
Under the town center the state geologic map shows Terrace deposits (sand), from the Pleistocene to Holocene, less than 2.6 million years old.
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 27×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 8 mi of the line.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 7 mi of the line.
Limestone. Age: Early Cretaceous, 100 to 113 million years old. About 7 mi of the line.
Limestone, marlstone. Age: Early Cretaceous, 100 to 145 million years old. About 1 mi of the line.
Clay, siltstone-mudstone. Age: Late Cretaceous, 66 to 100 million years old. About 0.5 mi of the line.
Limestone. Age: Late Cretaceous, 66 to 100 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 Selma reaches the Gulf of America by way of Cibolo Creek, the San Antonio, the Guadalupe and the South Guadalupe: about 230 river miles.
130 miles of the trip are on the San Antonio.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Selma; river miles along the main stem, rounded.
Selma has a hot desert climate. Summer afternoons average 96° in July; winter nights fall to about 41° in January. Barely 0.0 inches of rain fall in a normal year.
Normals 1991–2020 and records since 1948 at Randolph Afb, 4 miles southeast. NOAA, through RCC-ACIS.
