The Millry 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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Millry’s center stands about 130 ft above sea level. Within three miles the land runs from 100 ft to 270 ft, a difference of 170 ft: gently rolling country.
Under the town center the state geologic map shows Miocene Series undifferentiated (sand, clay), from the Miocene to Pliocene, 2.6 to 23 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 57×. 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, clay. Age: Miocene to Pliocene, 2.6 to 23 million years old. About 20 mi of the line.
Sand. Age: Holocene, less than 12,000 years old. About 2 mi of the line.
Clay, limestone. Age: Eocene, 34 to 56 million years old. About 1 mi of the line.
Limestone. Age: Oligocene, 23 to 34 million years old. About 1.0 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 Millry reaches Mobile Bay and the Gulf of America by way of Crosbys Creek, Mill Creek, Santa Bogue Creek, the Tombigbee and the Mobile: about 140 river miles.
65 miles of the trip are on the Tombigbee.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Millry; river miles along the main stem, rounded.
