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LERDAL SERIES <br /> The Lerdal series consists of very deep,somewhat poorly drained soils that formed in clayey glacial till or ' <br /> flow till on glacial moraines.Permeability is slow.Slopes range from 1 to 18 percent.Mean annual <br /> precipitation is about 29 inches.Mean annual air temperature is about 48 degrees F. <br /> TAXONOMIC CLASS: Fine, smecritic, mesic Aeric Vertic Epiaqualfs <br /> TYPICAL PEDON:Lerdal silty clay loam with a plane slope of about 4 percent on a <br /> glacial moraine at an elevation of 1,290 feet in a pasture field. (Colors are for moist soil <br /> unless otherwise stated.) <br /> Ap--O to 7 inches;black(lOYR 2/1) silty clay loam, dark gray(lOYR 4/1) dry; weak <br /> very fine subangular blocky structure; friable; about 2 percent gravel, mostly shale; <br /> slightly acid; abrupt smooth boundary(6 to 10 inches thick) <br /> E--7 to 9 inches; very dark gray(lOYR 3/1) silty clay loam, gray(lOYR 6/1) dry; many <br /> fine faint dark gray(lOYR 4/1)=Fe depletions;moderate fine subangular blocky structure; . <br /> friable; about 2 percent gravel, mostly shale; moderately acid; clear wavy boundary. (0 to <br /> 6 inches thick) ' � <br /> Btl--9 to 14 inches; dark grayish brown(lOYR 4/2) silty clay loam, few medium <br /> prominent light olive brown(2.SY 5/6)Fe concentrations; moderate fine and medium <br /> subangular blocky stxucture; firm; common faint very dark grayish brown(lOYR 3/2) <br /> coatings and clay films on faces of peds; about 2 percent gravel, mostly shale; moderately <br /> acid; clear wavy boundary. (0 to 10 inches thick) <br /> Bt2--14 to 20 inches; olive brown(2.SY 4/4) silty clay loam; common fine distinct light <br /> olive brown(2.SY 5/6) Fe concentrations; moderate fine and medium subangular blocky� <br /> structure; very firm; common distinct very dark grayish brown(2.SY 3/2) coatings and <br /> clay films on faces of peds; about 2 percent gravel, mostly shale;very strongly acid; clear <br /> wavy boundary. <br /> Btgl--20 to 30 inches; grayish brown(2.SY 5/2) silty clay; common fine distinct light <br /> olive brown(2.SY 5/6)Fe concentrations; moderate medium and coarse prismatic <br /> structure; very fum; common distinct very dark grayish brown(lOYR 3/2) clay films on <br /> faces of peds; about 2 percent gravel,mostly shale; strongly acid; clear wavy boundary. <br /> Btg2--30 to 42 inches; grayish brown(2.SY 5/2) clay loam; many fine and medium <br /> distinct light olive brown(2.SY 5/4) Fe concentrations;weak coarse prismatic struciure; <br /> firm; common faint very dark grayish brown(2.SY 3/2) clay films on faces of peds and in <br /> root channels; about 5 percent gravel,mostly shale; slightly acid; abrupt wavy boundary. <br /> - (Combined thickness of Bt and Btg horizons is 15 to 36 inches.) <br /> Bw-42 to 47 inches; olive brown(2.SY 4/4) clay loam; many fine and medium faint light <br /> olive brown(2.SY 5/4)Fe concentrations;weak coarse prismatic structure; firm; common <br /> prominent clay films in root channels; about 5 percent gravel, mostly shale; slightly <br />