The Howard 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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Howard’s center stands about 1,040 ft above sea level. Within three miles the land runs from 960 ft to 1,080 ft, a difference of 120 ft: gently rolling country.
Under the town center the state geologic map shows Shawnee Group (limestone, shale), from the Carboniferous, 299 to 324 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 35×. 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: Carboniferous, 299 to 324 million years old. About 10 mi of the line.
Limestone, shale. Age: Carboniferous, 299 to 324 million years old. About 8 mi of the line.
Sand, silt, clay. Age: Pleistocene to Holocene, less than 2.6 million years old. About 3 mi of the line.
Shale. Age: Carboniferous, 299 to 324 million years old. About 2 mi of the line.
Sand, silt, clay. Age: Pleistocene, less than 2.6 million years old. About 0.8 mi of the line.
Shale, sandstone. Age: Carboniferous, 299 to 324 million years old. About 0.4 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 Howard reaches the Gulf of America by way of the Elk River, the Verdigris, the Arkansas and the Mississippi: about 1,250 river miles.
Lakes on the way: Oologah Lake, Murray Lake, Ozark Lake and Elk City Lake.
600 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Howard; river miles along the main stem, rounded.
