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~~ <br />Bk horizon: Rock fragment content is 0 to 25 percent, <br />predominantly gravel sized. The calcium carbonate equivalent is 15 to <br />a0 percent. <br />Pinon soils in this survey area have mean annual soil temperature <br />of 47 to 50 degrees F, and a frost-free season of 90 to 130 days. <br />These characteristics are outside the range defined for the series at <br />its type location, but they do not significantly affect the use or <br />behavior of the soils. <br />