Name to distinctive strongly developed zonal soil formed on upper member Placer Creek formation (new), on lower member Placer Creek where not buried by upper member, locally on older deposits exposed in Lackey Creek time. Type locality on Lackey Creek, 2.5 mi west of La Sal, below crossing of State Hwy 46, NW1/4 SW1/4 sec 4, T29S, R24E, Grand Co, UT, Paradox basin. Occurs: 1) Brown Podzolic facies 8,400-11,500 ft elev., B horizon about 3-4.5 ft thick, yellow-red to brown, structureless though locally weak to moderate, fine to medium, angular to subangular blocky structure; 2) Brown Forest facies 7,400-9,000 ft elev., uniform, no A, B horizon 2.5-3 ft thick, yellow-red to red-yellow, weak to moderate, medium to fine, subangular to angular blocky, slightly plastic to plastic, Cca horizon 1.5-3 ft thick, brown, structureless to locally platy; 3) Brown soil facies 5,500-7,800 ft elev., A horizon 18 in thick, dark-gray, silty, weak to moderate, fine angular to subangular, blocky, nonplastic, friable, B horizon 2-3 ft thick brown, weak to moderate, fine to coarse, subangular to angular blocky, locally columnar, Cca horizon about 3 ft thick white to yellow-brown structureless to strongly platy; 4) Sierozem facies 5,500-5,800 ft elev., no A, Bca horizon 6 in-2 ft thick, brown, structureless to moderately blocky, Cca horizon 7 ft thick white to brown, structureless to strongly platy. Soil profiles, facies map, correlation chart. Of middle Wisconsin age.

Source: GNU records (USGS DDS-6; Denver GNULEX).