fine, smectitic, frigid Xeric Epiaquert
(Boulder Lake series)

Boulder Lake soils are found in smooth, flat enclosed interplateau basins and lake plains, where they have formed in silty lacustrine sediments. Over time, these silt-sized particles have weathered to clay, leading to an accumulation of clay in the profile. Although average annual precipitation is only about 14", these soils are subject to annual inundation for short periods as a result of runoff from higher-lying soils.

For more information about Boulder Lake soils, click here.