The Osborn 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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Osborn’s center stands about 510 ft above sea level. Within three miles the land runs from 200 ft to 620 ft, a difference of 420 ft: hilly country. The highest named summit within 15 miles is Lead Mountain, about 1,480 ft, 8 miles northeast.
Under the town center the state geologic map shows Devonian alkali feldspar granite (alkali-feldspar-granite), from the Devonian, 359 to 422 million years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 24×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Alkali-feldspar-granite. Age: Devonian, 359 to 422 million years old. About 21 mi of the line.
Siltstone, phyllite. Age: Neoproterozoic to Ordovician, 445 to 1,000 million years old. About 3 mi of the line.
Sandstone, limestone. Age: Ordovician to Devonian, 359 to 487 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 Osborn reaches the Atlantic Ocean by way of Johns Brook, the East Branch Union and the Union: about 35 river miles.
Lake on the way: Graham Lake.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Osborn; river miles along the main stem, rounded.
