The Wallis 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.
Partly cloudy
Showers likely
Chance of showers; cooler
Sunny
Partly cloudy; warmer
Partly cloudy
Partly cloudy
Wallis’s center stands about 130 ft above sea level. Within three miles the land runs from 80 ft to 150 ft, a difference of 70 ft: gently rolling country.
Under the town center the state geologic map shows Beaumont Formation, areas predominantly clay (clay, silt), from the Pleistocene, less than 2.6 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.
Clay, silt. Age: Pleistocene, less than 2.6 million years old. About 12 mi of the line.
Sand. Age: Pleistocene, less than 2.6 million years old. About 7 mi of the line.
Silt, sand, clay. Age: Pleistocene, less than 2.6 million years old. About 5 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 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 Wallis reaches the Gulf of America by way of Elm Slough and the San Bernard: about 100 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Wallis; river miles along the main stem, rounded.
