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BLUE EARTH SERIES <br /> The Blue Earth series consists ofvery deep,very poorly drained soils that formed in coprogenous earth in <br /> postglacial lakes and flood plains. S(opes range from 0 to i percent. Ntean annual precipitation is about 71 l <br /> mm(�8 inches). i�tean annual temperature is about 9 degrees C (�43 degrees F). <br /> TAXONOMIC CLASS: Fine-silty, mixed, superactive, calcareous, mesic Ivtollic <br /> Fluvaquents <br /> TYPICAL PEDON: Blue Earth mucky silty clay loam with a p(ane 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 shefls <br /> and fra�ments of snail shells; sfightly effervescent; slightly alkaline; abrupt smooth <br /> boundary. [20 to 30 cm (8 to 12 inches thick)] <br /> Cg--25 to 173 cm (l0 to 63 inches); very dark gray (IOYR 3/1) mucky sifty clay loam <br /> (coprogenous earth), very dark gray (SY 3/l) c(ay loam, and dark olive gray (SY 3/2) <br /> clay loam; few �ine prominent darlc brown (7.SYR 3/2) and few fine dark ceddish brown <br /> (�YR 3/2) Fe concentrations; massive with distinct bedding planes; very friable; snai) <br /> she(ls ranging from few to many in different pa��ts; strongly effervescent; s(ightly <br /> alkaline. <br /> 2Cg1--(73 to 183 cm (68 to 72 inches); dark o(ive gray (SY 3/2) clay loam; massive; <br /> friable; few snail shells; strongly effervescent; s(ightly alkaline; c(ear smooth boundary. <br /> 2Cg2--183 to 203 cm (72 to 80 inches); very dark gray (5Y 3/1) clay loam; massive; <br /> friable; common snail shells; strongly effervescent; slight(y alkaline. <br /> TYPE LOCATION: Iviartin County, Minnesota; about 9 mi(es 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. I 01 N., R. 29 W.; USGS East Chain quadrangle; lat. 43 degrees 3 I <br /> minutes 44 seconds N. and long. 94 degrees 19 minutes l6 seconds W., NAD 27. <br /> RANGE IN CHARACTERISTICS: The thickness of the coprogenous earth and the <br /> depth to loamy g(acial till or glacia( lacustrine sediments ranges from 76 cm (30 to more <br /> than 203 cm (80 inches). Free carbonates are in al( 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. [t is mucicy 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 I OYR, 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 />