The Chilo 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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Chilo’s center stands about 510 ft above sea level. Within three miles the land runs from 460 ft to 900 ft, a difference of 440 ft: hilly country. The highest named summit within 15 miles is Greenwood Hill, about 900 ft, 14 miles west-southwest.
Under the town center the state geologic map shows Point Pleasant Formation (limestone, shale), from the Late Ordovician, 445 to 459 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 36×. 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 11 mi of the line.
Shale, limestone. Age: Ordovician, 445 to 487 million years old. About 9 mi of the line.
Limestone. Age: Ordovician, 445 to 487 million years old. About 2 mi of the line.
Limestone, shale. Age: Late Ordovician, 445 to 459 million years old. About 0.7 mi of the line.
Shale. Age: Middle Ordovician to Late Ordovician, 445 to 471 million years old. About 0.4 mi of the line.
Sand, silt. Age: Pleistocene to Holocene, less than 2.6 million years old. About 0.3 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 Chilo reaches the Gulf of America by way of Bear Creek, the Ohio and the Mississippi: about 1,510 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 Chilo; river miles along the main stem, rounded.
