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beds. The limestone was precipitated on the lake bottom, probably during low stands; a <br />number of specimens displayed syneresis cracks formed by gas bubbles (e.g., methane) <br />effusing from the lake bed. <br />A number of small, high-angle normal faults are present throughout the area, with <br />off-sets ranging from a few feet to over a hundred feet (Plate 1). Most of these are probably <br />the result of settling and regional tectonic stresses associated with the then continuing <br />Laramide Orogeny and subsequent epirogenic uplift of the western continent during the <br />Miocene. Cross-weaving sets of joint fractures are also evidence of tectonic stress. <br /> Plate 1. Example of a small high <br />angular fault, many of which are <br />present throughout the Piceance <br />area. <br />Soils are of the Glendive and Harve sandy loams in the bottomland along Yellow <br />Creek. Piceance, Rentsac, Redcreek-Rentsac, Rentsac-Piceance, Torriorthents-Rock <br />outcrop complex and Yamac types are on the slopes and ridges (U.S.D.A. SCS 1982). In <br />general, they are cool, shallow to moderately deep, well-drained, and characteristically <br />calcareous or alkaline. Because they are shallow and low in temperature, the agricultural <br />4