The Poth 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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Poth’s center stands about 410 ft above sea level. Within three miles the land runs from 340 ft to 480 ft, a difference of 140 ft: gently rolling country. The highest named summit within 15 miles is Marcelinas Hills, about 570 ft, 7 miles north-northwest.
Under the town center the state geologic map shows Yegua Formation (claystone, sandstone), from the Eocene, 34 to 56 million years old.
The section below crosses 12 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 60×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Siltstone, sandstone. Age: Middle Eocene, 38 to 48 million years old. About 7 mi of the line.
Claystone, sandstone. Age: Eocene, 34 to 56 million years old. About 6 mi of the line.
Mudstone, sand. Age: Oligocene, 23 to 34 million years old. About 3 mi of the line.
Clay, sand. Age: Late Eocene to Early Oligocene, 28 to 38 million years old. About 2 mi of the line.
Sandstone-mudstone. Age: Late Eocene, 34 to 38 million years old. About 2 mi of the line.
Claystone, sandstone. Age: Eocene, 34 to 56 million years old. About 2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 6 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 Poth reaches the Gulf of America by way of Marcelinas Creek, the San Antonio, the Guadalupe and the South Guadalupe: about 170 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Poth; river miles along the main stem, rounded.
