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fraction is mostly fragments of shells. It is slightly alkaline ar moderately alkaline. The <br /> calcium carbonate equivalent ranges from 5 to 40 percent. <br /> The 2Cg horizon has hue of 2.SY or SY, value of 3 to 5, and chroma of 1 or 2. It is loam, <br /> silt loam, clay loam, 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 of clay loam with a <br /> moist bulk density of 1.6 to 1.9 gm/cc is also recognized. <br /> COMPETING SERIES: These are the Mounclpi•airie and Uturin (T) series. These soils <br /> do not have coprogenous earth in the series control section. <br /> GEOGRAPHIC SETTING: These soils have plane or slightly concave slopes with <br /> gradient of 0 to 1 percent. They are in small to large lake basins in glacial moraines, flood <br /> plains, and lacustrine plains. These basins formerly had lakes, and most of the lakes were <br /> drained since settlement. These sediments are underlain by loamy till or lacustrine <br /> sediments of the Late Wisconsin glaciation at depths of 76 cm (2.5 to more than 203 cm. <br /> Mean annual temperature is 7 to 11 degrees C (45 to 50 degrees F). Mean annual <br /> precipitation is 610 mm to 813 mm (24 to 32 inches). Frost free days range from 155 to <br /> 200. Elevations above sea level range from 213 m to 480 m (700 to 1570 feet). <br /> GEOGRAPHICALLY ASSOCIATED SOILS: These are other poorly drained and <br /> very poorly drained mineral and organic soils within the basin and the Clarion and Lester <br /> soils and their respective topographic associates on the adjacent uplands. <br /> DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Very poorly <br /> drained. Surface runoff is negligible to ponded. The saturated hydraulic conductivity, <br /> measured in cm per hour, is .OS to 5.1 (.02 to 2.0 inches) in the upper material and .OS to <br /> 1.5 (.02 to .6 inches) in the lower part. Seasonal high saturation ranges from plus 91 to 30 <br /> cm (3 to 1 foot) for undrained areas of this soil. Areas that are drained have variable <br /> depths to saturation based on the effectiveness of the drainage network. <br /> USE AND VEGETATION: Most of this soil is cropped to corn and soybeans. Some is <br /> used for pasture or hay. Invasive vegetation (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 /> DISTRIBUTION AND EXTENT: MLRA-103. Southern Minnesota and north-central <br /> Iowa. Moderately extensive. <br /> MLRA OFFICE RESPONSIBLE: St. Paul, Minnesota <br /> SERIES ESTABLISHED: Rock County, Minnesota, 1945. <br /> REMARKS: Problems remain in the classification of these series because no taxon has <br /> been defined in Soil Taxonomy that adequately accommodates soils that have formed <br /> entirely in coprogenous earth. Diagnostic horizons and features recognized in this pedon <br /> are: Surface horizon that meets requirements of a mollic epipedon except it is underlain <br />