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tOfficial Series Description - LERDAL Series Page 1 of 3 ' LOCATION LERDAL MN Established Series ' Rev. JUS-ELB-JFB-KDS 2/98 LERDAL SERIES ' The Lerdal series consists of very deep, somewhat poorly drained soils that formed in clayey glacial till or flow till on glacial moraines. Permeability is slow. Slopes range from 1 to 18 percent. Mean annual precipitation is about 29 inches. Mean annual air temperature is about 48 degrees F. TAXONOMIC CLASS: Fine, smectitic, mesic Aeric Vertic Epiaqualfs ' TYPICAL PEDON: Lerdal silty clay loam with a plane slope of about 4 percent on a glacial moraine at an elevation of 1,290 feet in a pasture field. (Colors are for moist soil unless otherwise stated.) Ap--O to 7 inches; black(1 OYR 2/1) silty clay loam, dark gray (1 OYR 4/1) dry; weak very fine subangular blocky structure; friable; about 2 percent gravel, mostly shale; slightly acid; abrupt smooth ' boundary (6 to 10 inches thick) E--7 to 9 inches; very dark gray (I OYR 3/1) silty clay loam, gray(I OYR 6/1) dry; many fine faint dark ' gray (1 OYR 4/1) Fe depletions; moderate fine subangular blocky structure; friable; about 2 percent gravel,mostly shale; moderately acid; clear wavy boundary. (0 to 6 inches thick) Btl--9 to 14 inches; dark grayish brown(I OYR 4/2) silty clay loam, few medium prominent light olive brown(2.5Y 5/6)Fe concentrations; moderate fine and medium subangular blocky structure; firm; common faint very dark grayish brown(1 OYR 3/2)coatings and clay films on faces of peds; about 2 percent gravel, mostly shale; moderately acid; clear wavy boundary. (0 to 10 inches thick) Bt2--14 to 20 inches; olive brown(2.5Y 4/4) silty clay loam; common fine distinct light olive brown (2.5Y 5/6) Fe concentrations;moderate fine and medium subangular blocky structure; very firm; . common distinct very dark grayish brown(2.5Y 3/2) coatings and clay films on faces of peds; about 2 percent gravel, mostly shale; very strongly acid; clear wavy boundary. ' Btgl--20 to 30 inches; grayish brown(2.5Y 5/2) silty clay; common fine distinct light olive brown (2.5Y 5/6)Fe concentrations;moderate medium and coarse prismatic structure; very firm; common distinct very dark grayish brown(10YR 3/2)clay films on faces of peds; about 2 percent gravel, mostly shale; strongly acid; clear wavy boundary. ' Btg2--30 to 42 inches; grayish brown(2.5Y 5/2) clay loam; many fine and medium distinct light olive brown(2.5Y 5/4) Fe concentrations; weak coarse prismatic structure; firm; common faint very dark grayish brown(2.5Y 3/2) clay films on faces of peds and in root channels; about 5 percent gravel, ' mostly shale; slightly acid; abrupt wavy boundary. (Combined thickness of Bt and Btg horizons is 15 to 36 inches.) ' Bw--42 to 47 inches; olive brown(2.5Y 4/4) clay loam; many fine and medium faint light olive brown (2.5Y 5/4) Fe concentrations; weak coarse prismatic structure; firm; common prominent clay films in htt ://ortho.ftw.nres.usda. ov/c i-bin/osd/osdname.c i?-P 11/2/2004 P g g g