The Avoca 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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Avoca’s center stands about 1,360 ft above sea level. Within three miles the land runs from 1,140 ft to 1,420 ft, a difference of 280 ft: rolling country. The highest named summit within 15 miles is Whitney Mountain, about 1,820 ft, 9 miles east.
Under the town center the state geologic map shows Boone Formation (limestone), from the Carboniferous, 324 to 359 million years old.
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 26×. 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. Age: Carboniferous, 324 to 359 million years old. About 21 mi of the line.
Shale, limestone, dolostone. Age: Early Devonian to Carboniferous, 324 to 422 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 Avoca reaches the Gulf of America by way of Beaver Lake, the White River and the Mississippi: about 1,240 river miles.
Lakes on the way: Table Rock Lake and Beaver Lake.
620 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Avoca; river miles along the main stem, rounded.
