The Williamsburg 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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Williamsburg’s center stands about 810 ft above sea level. Within three miles the land runs from 770 ft to 960 ft, a difference of 190 ft: gently rolling country.
Under the town center the state geologic map shows Grant Lake Limestone and Fairview Formation, Undivided (limestone, shale), from the Late Ordovician, 445 to 459 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 42×. 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, shale. Age: Late Ordovician, 445 to 459 million years old. About 16 mi of the line.
Shale, limestone. Age: Late Ordovician, 445 to 454 million years old. About 4 mi of the line.
Shale. Age: Middle Ordovician to Late Ordovician, 445 to 471 million years old. About 2 mi of the line.
Shale, limestone, dolostone. Age: Late Ordovician, 445 to 454 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.
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 Williamsburg reaches the Gulf of America by way of the East Fork Little Miami, the Little Miami, the Ohio and the Mississippi: about 1,530 river miles.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Williamsburg; river miles along the main stem, rounded.
