The Unity 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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14° on Nov. 12, 2019, the coldest reading for this week of the year since 1987. Next is 16° in 1997.
Unity’s center stands about 340 ft above sea level. Within three miles the land runs from 310 ft to 460 ft, a difference of 150 ft: gently rolling country. The highest named summit within 15 miles is Italian Hill, about 900 ft, 12 miles north-northwest.
Under the town center the state geologic map shows Tamms Group (limestone), from the Silurian to Early Devonian, 394 to 425 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 37×. 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: Silurian to Early Devonian, 394 to 425 million years old. About 12 mi of the line.
Shale, sandstone. Age: Paleocene to Pliocene, 2.6 to 66 million years old. About 10 mi of the line.
Clay, silt, sand. Age: Holocene, less than 12,000 years old. About 1 mi of the line.
Limestone. Age: Middle Devonian, 384 to 394 million years old. About 0.6 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 Unity reaches the Gulf of America by way of the Cache and the Mississippi: about 990 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Unity; river miles along the main stem, rounded.
Unity has a humid subtropical climate. Summer afternoons average 89° in July; winter nights fall to about 26° in January. About 51 inches of rain fall in a normal year.
Normals 1991–2020 and records since 1987 at Cairo 3 N, 9 miles south-southeast. NOAA, through RCC-ACIS.
