USDA named a soil series after Mecklenburg County in 1910
The Mecklenburg soil series was established in Mecklenburg County in 1910, though its type location is over in Davidson County. It runs 40 to 60 percent clay in the Bt horizon over lower horizons of gray clayey saprolite. Cecil sits alongside it, 35 to 70 percent clay with 2 to 20 percent or more mica by volume over saprolite from about 50 inches, and that mica and quartz load is what dulls carbide. NC State Extension adds that clay particles align and compact when wet. The working picture, inferred rather than measured: grindings that come out a wood-and-clay composite, and backfill that settles as the wood rots.