The Learned 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.
Sunny
Partly cloudy; warmer
Mostly sunny
Sunny
Mostly sunny
Mostly sunny
Mostly sunny
Learned’s center stands about 220 ft above sea level. Within three miles the land runs from 160 ft to 380 ft, a difference of 220 ft: rolling country.
Under the town center the state geologic map shows Catahoula formation (sand), from the Miocene, 5.3 to 23 million years old.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 54×. 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. Age: Miocene, 5.3 to 23 million years old. About 24 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 Learned reaches the Gulf of America by way of Bitter Creek, Fourteenmile Creek, the Big Black and the Mississippi: about 500 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Learned; river miles along the main stem, rounded.
