The Oldenburg 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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80° on Nov. 11, 2020, the hottest reading for this week of the year since 1925. Next is 79° in 1955.
Oldenburg’s center stands about 900 ft above sea level. Within three miles the land runs from 770 ft to 1,040 ft, a difference of 270 ft: rolling country. The highest named summit within 15 miles is Battle Point, about 1,070 ft, 14 miles northeast.
Under the town center the state geologic map shows Dillsboro Formation (limestone, shale), from the Ordovician, 445 to 487 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 42×. 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: Ordovician, 445 to 487 million years old. About 9 mi of the line.
Limestone, shale. Age: Ordovician, 445 to 487 million years old. About 7 mi of the line.
Limestone. Age: Silurian, 422 to 445 million years old. About 6 mi of the line.
Shale. Age: Ordovician, 445 to 487 million years old. About 1 mi of the line.
Limestone, dolostone. Age: Devonian, 359 to 422 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 Oldenburg reaches the Gulf of America by way of Harvey Branch, Salt Creek, the Whitewater, the Great Miami, 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 Oldenburg; river miles along the main stem, rounded.
Oldenburg has a hot-summer humid continental climate. Summer afternoons average 87° in July; winter nights fall to about 21° in January. A normal year brings about 18 inches of snow; with the rain, that comes to about 44 inches of water.
On November 14 Oldenburg normally reaches 55° and falls to 33°. The record high is 79°, in 1955; the record low 9°, in 1986. The most rain on this date, 1.55 in, fell in 1972.
Normals 1991–2020 and records since 1925 at Brookville, 12 miles east-northeast, 270 ft lower. NOAA, through RCC-ACIS.
