The Lake 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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Lake’s center stands about 450 ft above sea level. Within three miles the land runs from 410 ft to 570 ft, a difference of 160 ft: gently rolling country. The highest named summit within 15 miles is Walk Hill, about 670 ft, 7 miles south-southwest.
Under the town center the state geologic map shows Jackson group (clay), from the Eocene, 34 to 56 million years old.
The section below crosses 3 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. Age: Eocene, 34 to 56 million years old. About 16 mi of the line.
Clay, sand. Age: Eocene, 34 to 56 million years old. About 4 mi of the line.
Marl, sand. Age: Eocene, 34 to 56 million years old. About 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 Lake reaches the Gulf of America by way of Barnett Creek, Tuscolameta Creek and the Pearl: about 410 river miles.
Lake on the way: Cypress Lake.
310 miles of the trip are on the Pearl.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lake; river miles along the main stem, rounded.
