The Grenville 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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Grenville’s center stands about 5,970 ft above sea level. Within three miles the land runs from 5,810 ft to 6,100 ft, a difference of 290 ft: rolling country. The highest named summit within 15 miles is Little Grande, about 6,810 ft, 10 miles west-northwest.
The section below crosses 2 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 19×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Basalt, andesite. Age: Pliocene, 2.6 to 5.3 million years old. About 18 mi of the line.
Sand. Age: Middle Miocene to Early Pliocene, 3.6 to 16 million years old. About 6 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 Grenville reaches the Gulf of America by way of Seneca Creek, the Beaver, the North Canadian, the Canadian, the Arkansas and the Mississippi: about 1,830 river miles.
Lakes on the way: Canton Lake, Murray Lake and Ozark 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 Grenville; river miles along the main stem, rounded.
