The Siesta Acres 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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Siesta Acres’s center stands about 760 ft above sea level. Within three miles the land runs from 690 ft to 870 ft, a difference of 180 ft: gently rolling country. The highest named summit within 15 miles is Chapotal Hill, about 920 ft, 8 miles east-northeast.
Under the town center the state geologic map shows Olmos Formation (sandstone, claystone), from the Late Cretaceous, 66 to 72 million years old.
The section below crosses 4 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.
Black-shale. Age: Late Cretaceous, 66 to 72 million years old. About 10 mi of the line.
Gravel. Age: Late Pliocene to Pleistocene, less than 3.6 million years old. About 2 mi of the line.
Sandstone, claystone. Age: Late Cretaceous, 66 to 72 million years old. About 1 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 1 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 Siesta Acres reaches the Gulf of America by way of the Rio Grande: about 500 river miles.
Lake on the way: Paz Ramirez Lake.
270 miles of the trip are on the Rio Grande.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Siesta Acres; river miles along the main stem, rounded.
