The Liberty 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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Liberty’s center stands about 350 ft above sea level. Within three miles the land runs from 280 ft to 450 ft, a difference of 170 ft: gently rolling country.
Under the town center the state geologic map shows Citronelle formation (sand, gravel), from the Pliocene to Pleistocene, less than 5.3 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.
Sand, gravel. Age: Pliocene to Pleistocene, less than 5.3 million years old. About 21 mi of the line.
Clay, sand. Age: Miocene, 5.3 to 23 million years old. About 3 mi of the line.
Clay, silt, sand. Age: Pleistocene, less than 2.6 million years old. About 0.1 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 Liberty reaches Lake Pontchartrain and the Gulf of America by way of Speculation Creek, the West Fork Amite and the Amite: about 150 river miles.
Lake on the way: Lake Maurepas.
120 miles of the trip are on the Amite.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Liberty; river miles along the main stem, rounded.
