The Sardinia 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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7° on Nov. 13, 2019, the coldest reading for this week of the year since 1893. Next is 9° in 1894.
Sardinia’s center stands about 960 ft above sea level. Within three miles the land runs from 910 ft to 1,030 ft, a difference of 120 ft: gently rolling country. The highest named summit within 15 miles is Calebs Hill, about 1,160 ft, 10 miles north-northeast.
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 46×. 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, limestone, dolostone. Age: Late Ordovician, 445 to 454 million years old. About 16 mi of the line.
Limestone, shale. Age: Late Ordovician, 445 to 459 million years old. About 4 mi of the line.
Shale. Age: Silurian, 422 to 445 million years old. About 2 mi of the line.
Dolostone. Age: Silurian, 425 to 434 million years old. About 1 mi of the line.
Limestone. Age: Silurian, 422 to 445 million years old. About 0.8 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 Sardinia reaches the Gulf of America by way of Twin Run, White Oak Creek, the Ohio and the Mississippi: about 1,560 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 Sardinia; river miles along the main stem, rounded.
Sardinia has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 19° in January. A normal year brings about 18 inches of snow; with the rain, that comes to about 47 inches of water.
On November 14 Sardinia normally reaches 54° and falls to 32°. The record high is 75°, in 1909; the record low 7°, in 2019. The most rain on this date, 1.76 in, fell in 1972.
Normals 1991–2020 and records since 1893 at Hillsboro, 19 miles north-northeast. NOAA, through RCC-ACIS.
