The Pegram 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. 13, 1989, the hottest reading for this week of the year since 1941. Next is 82° in 2002.
Pegram’s center stands about 570 ft above sea level. Within three miles the land runs from 480 ft to 860 ft, a difference of 380 ft: rolling country. The highest named summit within 15 miles is Strambler Knob, about 1,010 ft, 14 miles southeast.
Under the town center the state geologic map shows Silurian Formations, including Decatur Limestone, Brownsport Group (Lobelville Formation, Bob Limestone, Beech River Formation), Wayne Group (Dixon Formation, Lego Formation, Waldron Shale, Laurel Limestone, Osgood Formation) and Brassfield Limestone, from the Silurian, 422 to 445 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 34×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Chert. Age: Carboniferous, 324 to 359 million years old. About 20 mi of the line.
Limestone. Age: Silurian, 422 to 445 million years old. About 2 mi of the line.
Fine-detrital, coarse-detrital. Age: Quaternary, less than 2.6 million years old. About 0.8 mi of the line.
Shale, limestone. Age: Ordovician, 445 to 487 million years old. About 0.3 mi of the line.
Limestone. Age: Devonian, 359 to 422 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 Pegram reaches the Gulf of America by way of Turner Creek, the Harpeth, the Cumberland, the Ohio and the Mississippi: about 1,230 river miles.
Lake on the way: Bards Lake.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Pegram; river miles along the main stem, rounded.
Pegram has a humid subtropical climate. Summer afternoons average 91° in July; winter nights fall to about 27° in January. About 50 inches of rain fall in a normal year, with about 1 inch of snow.
On November 14 Pegram normally reaches 63° and falls to 35°. The record high is 80°, in 1985; the record low 11°, in 2019. The most rain on this date, 1.85 in, fell in 1957.
Normals 1991–2020 and records since 1941 at Kingston Springs, 3 miles west. NOAA, through RCC-ACIS.
