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HAYDEN SERIES The Hayden series consists of deep well drained soils that formed in calcareous loamy glacial till on glacial moraines and till plains.These soils have moderate permeability. Their slopes range from 2 to 40 percent. Mean annual precipitation is about 28 inches, and mean annual temperature is about 46 degrees F. TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Glossic Hapludalfs TYPICAL PEDON: Hayden loam with a 6 percent convex slope on a terminal moraine in a deciduous forest (Colors are for moist soil unless otherwise noted.) A--O to 2 inches; very dark gray (lOYR 3/1) loam; weak fine granular structure; very friable; about 5 percent coarse fragments; neutral; abrupt smooth boundary. (1 to 4 inches thick) E--2 to 9 inches; dark grayish brown (lOYR 4/2) light loam; weak thin platy structure; very friable; few very dark gray (lOYR 3/1) worm casts in upper part; about 5 percent coarse fragments; slightly acid; clear wavy boundary. (0 to 12 inches thick) BE--9 to 14 inches; brown (lOYR 5/3) fine sandy loam; weak fine and medium subangular blocky structure; friable; many distinct coatings of clean sand and silt particles on faces of peds; about 5 percent coarse fragments; medium acid; clear wavy boundary. (0 to 8 inches thick) Bt1--14 to 28 inches; yellowish brown (lOYR 5/4) loam; moderate fine and medium subangular blocky structure; firm; few faint coatings of clean sand and silt particles and few faint dark yellowish brown (lOYR 4/4) clay films on faces of peds; about 5 percent coarse fragments; strongly acid; clear wavy boundary. Bt2--28 to 38 inches; yellowish brown (lOYR 5/4) loam; moderate fine and medium prismatic structure parting to moderate fine and medium angular blocky; firm; many distinct dark yellowish brown (lOYR 4/4) clay films on faces of peds; about 5 percent coarse fragments; few prominent black clayey fillings in root channels; strongly acid; clear wavy boundary. Bt3--38 to 43 inches; yellowish brown (lOYR 5/4) loam; few fine prominent reddish brown mottles; moderate fine and medium prismatic structure; friable; few distinet dark yellowish brown (lOYR 3/4) clay films on faces of peds; about 5 percent course fragments; slightly acid; abrupt wavy boundary. (Combined thickness of Bt horizons is 12 to 30 inches.) C--43 to 60 inches; light olive brown (2.SY 5/4)loam; few fine faint grayish brown (2.SY 5/2) and light olive brown (2.SY 5/6) mottles; massive; friable; and 5 percent coarse fragments; slight effervescence; mildly alkaline. TYPE LOCATION: Rice County, Minnesota; about 4 miles north of Faribault; 1,920 feet east and 30 feet north of the southwest corner of sec. 1, T. 110 N., R. 21 W. RANGE IN CHARACTERISTICS: Solum thickness and depth to free carbonates range from 24 to 54 inches. Coarse fragments of mixed lithology comprise 2 to 8 percent of the volume of the control section.