The Marietta 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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5.48 inches of rain fell in two days, the most for this week of the year since records began in 1903. The next wettest, 3.75 inches, fell in 2008.
Marietta’s center stands about 90 ft above sea level. Within three miles the land runs from 70 ft to 140 ft, a difference of 70 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.
Clay, sand. Age: Cretaceous, 66 to 145 million years old. About 12 mi of the line.
Limestone, sand. Age: Pleistocene, less than 2.6 million years old. About 7 mi of the line.
Sand, gravel. Age: Quaternary, less than 2.6 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 Marietta reaches the Atlantic Ocean by way of Bear Swamp, Ashpole Swamp, the Lumber, the Little Pee Dee, the Great Pee Dee, Schooner Creek and the Waccamaw: about 110 river miles.
55 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 Marietta; river miles along the main stem, rounded.
Marietta has a humid subtropical climate. Summer afternoons average 91° in July; winter nights fall to about 35° in January. About 43 inches of rain fall in a normal year.
On November 14 Marietta normally reaches 66° and falls to 42°. The record high is 83°, in 1931; the record low 21°, in 2013. The most rain on this date, 1.61 in, fell in 2008.
Normals 1991–2020 and records since 1903 from the Lumberton Area threaded record (Lumberton Regional Airport, 17 miles north-northeast). NOAA, through RCC-ACIS.
