The Ravenna 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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Ravenna’s center stands about 720 ft above sea level. Within three miles the land runs from 610 ft to 1,400 ft, a difference of 790 ft: hilly country. The highest named summit within 15 miles is Croley Mountain, about 1,630 ft, 14 miles southwest.
Under the town center the state geologic map shows New Albany, Chattanooga, and Ohio Shales, Boyle Dolomite (Limestone), and Sellersburg Limestone, undivided (black-shale), from the Devonian to Carboniferous, 324 to 422 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 23×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale. Age: Devonian to Carboniferous, 324 to 422 million years old. About 12 mi of the line.
Shale, siltstone. Age: Carboniferous, 299 to 324 million years old. About 6 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 4 mi of the line.
Black-shale. Age: Devonian to Carboniferous, 324 to 422 million years old. About 3 mi of the line.
Sand, silt. Age: Pleistocene to Holocene, less than 2.6 million years old. About 0.5 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 Ravenna reaches the Gulf of America by way of Cow Creek, the Kentucky, the Ohio and the Mississippi: about 1,630 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 Ravenna; river miles along the main stem, rounded.
