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Dowe Flats Quarry Soils and Geology Report <br /> LAPORTE SERIES <br /> The Laporte series consists of shallow, well drained soils that formed in material that weathered <br /> from limestone. Laporte soils are on upland hills and ridges and have slopes of 2 to 60 percent. <br /> The mean annual precipitation is about 16 inches and the mean annual temperature is about 48 <br /> degrees F. <br /> TAXONOMIC CLASS: Loamy, carbonatic, mesic Lithic Haplustolls <br /> TYPICAL PEDON: Laporte loam, rangeland. (Colors are for dry soil unless <br /> otherwise noted.) <br /> A--O to 9 inches; grayish brown (10YR 5/2) loam, very dark grayish brown (10YR 3/2) moist; <br /> moderate fine crumb structure; slightly hard, very friable; 5 percent limestone fragments; <br /> calcareous; moderately alkaline; clear smooth boundary. (5 to 16 inches thick) <br /> Ck--9 to 16 inches; light brownish gray (IOYR 6/2) channery loam, dark grayish brown (IOYR <br /> 4/2) moist; massive; slightly hard, friable; some secondary calcium carbonate occurring mostly <br /> as nodules; 30 percent limestone fragments; calcareous; moderately alkaline; gradual smooth <br /> boundary. (4 to 15 inches thick) <br /> R--16 inches; weakly fractured limestone. <br /> TYPE LOCATION: Larimer County, Colorado; approximately 1,712 feet north <br /> and 321 feet west of SE corner Sec. 1, T. 4 N., R. 70 W. <br /> RANGE IN CHARACTERISTICS: <br /> The average annual soil temperature is 49F. and the average summer soil temperature is 67F. <br /> The soils are dry more than .6 of the time that the soil temperature exceeds 5C. The mollic <br /> epipedon is 5 to 15 inches thick and the depth to the underlying bedrock is 10 to 20 inches. The <br /> mollic epipedon contains from .6 to 2 percent organic carbon which decreases uniformly with <br /> increasing depth. These soils are calcareous at or within a few inches of the surface. The control <br /> section is typically channery loam but ranges in clay from 15 to 35 percent, in silt from 20 to 55 <br /> percent, and sand from 15 to 60 percent, with more than 15 percent but less than 35 percent <br /> being fine sand or coarser. Rock fragments range from 5 to 35 percent by volume and are <br /> dominantly less than 6 inches in length. <br /> The A horizon has hue of 2.5Y through 7.5YR, value of 4 or 5 dry, 2 or 3 moist, and chroma of <br /> 1.5 to 3. Typically, it has granular or crumb structure but has weak subangular blocky structure <br /> in some pedons. It is soft or slightly hard and is mildly or moderately alkaline. <br /> The C horizon has hue of 2.5Y through 7.5YR. It is moderately or strongly alkaline. Calcium <br /> carbonate equivalent of the strongest part of the Ck horizon is about 16 percent but ranges from <br /> 10 to 35 percent. A considerable proportion of the calcium carbonate equivalent results from <br /> 13 May 2, 2022 <br />