The Susank 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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82° on Nov. 16, 2016, the hottest reading for this week of the year since 1949. Next is 81° in 1999.
Susank’s center stands about 1,970 ft above sea level. Within three miles the land runs from 1,880 ft to 1,980 ft, a difference of 100 ft: gently rolling country.
Under the town center the state geologic map shows Carlile Shale (shale, chalk), from the Late Cretaceous, 66 to 100 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 59×. 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: Late Cretaceous, 66 to 100 million years old. About 11 mi of the line.
Shale, chalk. Age: Late Cretaceous, 66 to 100 million years old. About 8 mi of the line.
Claystone, mudstone, shale. Age: Early Cretaceous, 100 to 145 million years old. About 3 mi of the line.
Sand, silt, clay. Age: Pleistocene to Holocene, less than 2.6 million years old. About 2 mi of the line.
Silt. Age: Pleistocene to Holocene, less than 2.6 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 Susank reaches the Gulf of America by way of Deception Creek, Little Cheyenne Creek, Cow Creek, the Arkansas and the Mississippi: about 1,480 river miles.
Lakes on the way: Murray Lake and Ozark Lake.
600 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Susank; river miles along the main stem, rounded.
Susank has a hot-summer humid continental climate. Summer afternoons average 93° in July; winter nights fall to about 19° in January. About 25 inches of rain fall in a normal year.
On November 14 Susank normally reaches 56° and falls to 30°. The record high is 80°, in 2025; the record low 3°, in 1959. The most rain on this date, 0.60 in, fell in 1968.
Normals 1991–2020 and records since 1949 at Russell Municipal Airport, 16 miles north, 110 ft lower. NOAA, through RCC-ACIS.
