Mean annual air temperature is about 48 degrees F. Mean annual precipitation is about 30 inches. Harps clay loam on a nearly level rim of a depression in a cultivated field. The mollic epipedon ranges from 12 to 24 inches thick. Horizons having evident structure extend to depths ranging from 30 to 50 inches, and solum thickness is assumed to be the same. Rock fragments of mixed lithology comprise about 1 to 5 percent of the volume of the control section, although in some pedons the upper 2 feet or less lack appreciable amounts.
Structure is weak except for the A horizon which has a stronger grade.
Calcium carbonate equivalent of the upper 6 to 18 inches centers on about 30 percent and ranges from 15 to 40 percent, except for thin layers which have as much as 45 percent. This is 5 to 20 percent more than in the upper part of the Cg horizon. The soil contains redoximorphic features with hue of 10YR or 2.5Y, value of 4 or 5, and chroma of 4 to 8, and they increase in size and number as depth increases. The Ap, Ak or A horizons have hue of 10YR or is neutral, value of 2 or 3 and chroma of 0 or 1. Dry colors have hue of 10YR or 5Y, value of 4 or 5 and chroma of 1.