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fraction is mostly fcabments of shefls. ft is slightly alkaline or moderately alkaline. The <br /> calcium carbonate equivalent ranges from 5 to 40 percent. <br /> The 2Cg i�orizon has hue of 2.SY ar SY, value of 3 ta 5, and chi•oma ofi I or 2. lt is loam, <br /> silt loam, cfay foam, or silty clay loam. It contains 0 to 8 percent by volume of rock <br /> fragments of mixed lithology. It is slightly alkaline or moderately alkaline and has a ', <br /> calcium carbonate equivalent of 5 to 20 percent. A firm till phase ofclay loarn with a �I <br /> moist bulk density of I.6 to L9 gmlcc is a(so recognized. ' <br /> 1 <br /> CON[P�TING S�RI�S: These are tlle :Atu�u��l����a%��i� and t_;tE�rin(T)series. These soils � <br /> do not have coprogenous ea►rth in the series controt section. ; <br /> CEOGRAPHIC SETTING: These soils have plane or slightly concave sfopes with <br /> gradietit of 0 to I percent. They are in small to (arge lake basins in glacial moraines, flood <br /> plai�ts, and lacustcine plains. Tliese basins formerly had lakes, and most of the lakes were <br /> drained since settfement. These sediments are underlain by loamy till or(acustrine <br /> sediments oFthe Late �Visconsin glaciation at depths of 76 cm (2.� to more than 203 cm. <br /> Mean annual temperature is 7 to 1 I degrees C (�� to �0 degrees F}. Mean annual <br /> precipitation is 6[0 mm to 813 mm(2�F to 32 inches). Frost free days cange from 1» to <br /> 200. Elevations above sea level range from 2l3 m to �480 m (700 to 1570 feet). <br /> G�OGRAPHICALLY ASSOCIAT�D SOILS: These are other poorly drained and <br /> very poorly drained mineral and organic soils within the basin and the c__i��ri��n and l �-:>t�r <br /> soils atid their respective topographic associates on the adjacent uplands. <br /> DRAINAGC AND SATURATCD HYDRAULIC CONDUCTIVITY: Very poorly <br /> drained. Surface runoff is negligible to ponded. The saturated hydraulic co�lductivity, <br /> measured in cm per hour, is .OS to 5.1 (.0? to 2.0 inches) in the upper material and .05 to <br /> 1.5 (.02 to .6 inches} in the lower part. Seasona( }Iigh saturation ranges fi�on� pfus 91 to 30 <br /> cin (3 to I foot) for undrained areas of this soil. Areas that are drained have variable <br /> depths to saturation based on the eftectiveness of�the draina�e net�vork. <br /> US� AIYD V�GETATION: Most of this soil is cropped to corn and soybeans. Some is <br /> used for pasture or hay. Invasive ve�etation(after drainage) is mostly sedges, reeds, and <br /> grasses. They lack native vegetation in the conventional sense because these soils were, <br /> until recently, sediments in the bottom of lakes. <br /> DISTRIQUTIOI�r AND �XTCNT: MLRA-103. Southern Vtinnesota and north-central <br /> Io�va. ivtoderately extensive. <br /> MLItA OFFICC RESPONSIBL�: St. Paul, Minnesota <br /> S�RI�S CSTABLISHED: Rock Coiinty, Ivlinnesota, !9�5. <br /> RENIARKS: Probiems remain in the classifieation of these series because no ta:con has <br /> been defined in Soi( Taxono►ny that adequately accotnmodates soils tl�at have forcned <br /> entirely in coprogenous earth. Diagnostic horizons and features recognized in this pedon <br /> are: Surface horizon that meets requirements oFa mol[ic epipedon except it is underlain <br /> � <br />