The Crosby 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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Crosby’s center stands about 180 ft above sea level. Within three miles the land runs from 150 ft to 400 ft, a difference of 250 ft: rolling country. The highest named summit within 15 miles is Greenwood Hill, about 440 ft, 5 miles west-southwest.
Under the town center the state geologic map shows Pascagoula and Hattiesburg formation (clay, sand), from the Miocene, 5.3 to 23 million years old.
The section below crosses 2 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 49×. 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, sand. Age: Miocene, 5.3 to 23 million years old. About 20 mi of the line.
Sand, gravel. Age: Pliocene to Pleistocene, less than 5.3 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 Crosby reaches the Gulf of America by way of Redding Creek, Foster Creek, the Homochitto and the Mississippi: about 390 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Crosby; river miles along the main stem, rounded.
