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Show 530 the Colorado and on the Green river side as pronounced escarpments, and with the exception of two or three places are inaccessible; there is one of those above the other, a serious [ sic. series] of then separated by shale slopes." R. 1311. Such geological formations contribute to " a certain extent" to the silt in the Colorado and the Green Rivers. " The heavy sandstones are not eroded, but between the sandstones are thick strata of red shale, which will erode very easily, and can be carried in the streams down the steep descent by torrential rains." R. 1311. Coming southwest from Thompson the road forks, one road going west to Greenriver and one south to Moab. " At the forks of the road is the post office or ranch and reservoir known as Valley City. In there there is marine shale at the surface, which is all covered with a slight deposit of silt -- not silt, but wind- blown material; that is flat, nearly fist, and very rolling; but as you proceed southwest from there you get into very ragged country, with high sandstone buttes, mesas, and cap rock, over which is deposited a loose and very thin deposit of wind- blown sand. " There may be a deposit of sand in one place today, and not be there tomorrow. " Q What about the vegetation on that? " A The vegetation on this fist southwest of |