The Oak Hill 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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Oak Hill’s center stands about 410 ft above sea level. Within three miles the land runs from 190 ft to 410 ft, a difference of 220 ft: rolling country.
The section below crosses 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 53×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Limestone. Age: Paleocene, 56 to 66 million years old. About 9 mi of the line.
Clay, sand. Age: Paleocene, 56 to 66 million years old. About 5 mi of the line.
Silt, clay. Age: Paleocene, 56 to 66 million years old. About 4 mi of the line.
Sand, clay. Age: Paleocene, 56 to 66 million years old. About 2 mi of the line.
Sand. Age: Holocene, less than 12,000 years old. About 2 mi of the line.
Clay, sand. Age: Paleocene, 56 to 66 million years old. About 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. 2 smaller units along the line are not listed.
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 Oak Hill reaches Mobile Bay and the Gulf of America by way of Callie Creek, Bear Creek, Pine Barren Creek, the Alabama and the Mobile: about 260 river miles.
170 miles of the trip are on the Alabama.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Oak Hill; river miles along the main stem, rounded.
