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BLUE EARTH SERIES <br /> The Blue Earth series consists of very deep,very poorly drained soils that formed in coprogenous earth in <br /> postglacial lakes and flood plains.Slopes range from 0 to 1 percent.Mean annual precipitation is about 711 <br /> mm(28 inches).Mean annual temperature is about 9 degrees C(48 degrees F). <br /> TAXONOMIC CLASS: Fine-silty, mixed, superactive, calcareous, mesic Mollic <br /> Fluvaquents <br /> TYPICAL PEDON: Blue Earth mucky silty clay loam with a plane level slope in the <br /> bottom of a former postglacial lake; cultivated field. (Colors are for moist soil unless <br /> otherwise noted.) <br /> Ap--O to 25 cm(0 to 10 inches);black (lOYR 2/1) mucky silty clay loam(coprogenous <br /> earth), dark gray (SY 4/1) dry; weak fine granular structure; very friable; few snail shells <br /> and fragments of snail shells; slightly effervescent; slightly alkaline; abrupt smooth <br /> boundary. [20 to 30 cm(8 to 12 inches thick)] <br /> Cg--25 to 173 cm(10 to 68 inches); very dark gray(lOYR 3/1) mucky silty clay loam <br /> (coprogenous earth), very dark gray(SY 3/1) clay loam, and dark olive gray (SY 3/2) <br /> clay loam; few fine prominent dark brown (7.SYR 3/2) and few fine dark reddish brown <br /> (SYR 3/2)Fe concentrations; massive with distinct bedding planes; very friable; snail <br /> shells ranging from few to many in different parts; strongly effervescent; slightly <br /> alkaline. <br /> 2Cg1--173 to 183 cm(68 to 72 inches); dark olive �ray(SY 3/2) clay loam; massive; <br /> friable; few snail shells; strongly effervescent; slightly alkaline; clear smooth boundary. <br /> 2Cg2--183 to 203 cm(72 to 80 inches); very dark gray(SY 3/1) clay loam; massive; <br /> friable; common snail shells; strongly effervescent; slightly alkaline. <br /> TYPE LOCATION: Martin County, Minnesota; about 9 miles south and 7 miles east of <br /> Fairmont; about 472 m(1,550 feet) east and 30 m (100 feet) south of the northwest <br /> corner of sec. 28, T. 101 N., R. 29 W.; USGS East Chain quadrangle; lat. 43 degrees 31 <br /> minutes 44 seconds N. and long. 94 degrees 19 minutes 16 seconds W.,NAD 27. <br /> RANGE IN CHARACTERISTICS: The thickness of the coprogenous earth and the <br /> depth to loamy glacial till ar glacial lacustrine sediments ranges from 76 cm(30 to more <br /> than 203 cm (80 inches). Free carbonates are in all parts of these sediments. The <br /> coprogenous earth contains from 0 to 25 percent by volume of shell fragments. <br /> The Ap or A horizon has hue of lOYR, 2.SY, SY or neutral, value of 2 or 3 and chroma <br /> of 0 to 2. It is mucky silty clay loam, mucky silt loam, mucky silty clay, silt loam or silty <br /> clay loam. Some pedons have muck(sapric) surface layers less than 20 cm (8 inches) <br /> thick. <br /> The Cg horizon has hue of lOYR, 2.SY, SY or neutral, value of 2 to 4, and chroma of 0 to <br /> 2. It is silt loam, silty clay loam, loam, or clay loam, or mucky analogues. The sand <br />