The Shiro 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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Shiro’s center stands about 360 ft above sea level. Within three miles the land runs from 310 ft to 420 ft, a difference of 110 ft: gently rolling country.
Under the town center the state geologic map shows Catahoula Formation (mudstone, sand), from the Oligocene, 23 to 34 million years old.
The section below crosses 7 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.
Clay, sandstone. Age: Miocene, 5.3 to 23 million years old. About 9 mi of the line.
Sandstone-mudstone. Age: Late Eocene, 34 to 38 million years old. About 5 mi of the line.
Mudstone, sand. Age: Oligocene, 23 to 34 million years old. About 4 mi of the line.
Sandstone. 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.
Coarse-detrital, fine-detrital. Age: Pliocene, 2.6 to 5.3 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. 1 smaller unit 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 Shiro reaches Galveston Bay and the Gulf of America by way of Lake Creek, the West Fork San Jacinto, the San Jacinto and Buffalo Bayou: about 120 river miles.
Lake on the way: Lake Houston.
55 miles of the trip are on Lake Creek.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Shiro; river miles along the main stem, rounded.
