The Gibson 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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3.60 inches of rain fell in two days, the most for this week of the year since records began in 1946. The next wettest, 3.51 inches, fell in 2009.
Gibson’s center stands about 260 ft above sea level. Within three miles the land runs from 210 ft to 320 ft, a difference of 110 ft: gently rolling country.
Under the town center the state geologic map shows Yorktown Formation and Duplin Formation, Undivided (clay), from the Tertiary, 2.6 to 66 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 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand, clay. Age: Pliocene, 2.6 to 5.3 million years old. About 11 mi of the line.
Sand. Age: Cretaceous, 66 to 145 million years old. About 8 mi of the line.
Sand. Age: Tertiary, 2.6 to 66 million years old. About 3 mi of the line.
Clay. Age: Tertiary, 2.6 to 66 million years old. About 2 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 Gibson reaches the Atlantic Ocean by way of Beaverdam Creek, the Little Pee Dee, the Great Pee Dee, Schooner Creek and the Waccamaw: about 160 river miles.
120 miles of the trip are on the Little Pee Dee.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Gibson; river miles along the main stem, rounded.
Gibson has a humid subtropical climate. Summer afternoons average 93° in July; winter nights fall to about 33° in January. About 47 inches of rain fall in a normal year, with about 1 inch of snow.
On November 14 Gibson normally reaches 66° and falls to 42°. The record high is 82°, in 1989; the record low 24°, in 2013. The most rain on this date, 1.61 in, fell in 1947.
Normals 1991–2020 and records since 1946 at Laurinburg, 8 miles east. NOAA, through RCC-ACIS.
