CHANNELED SCABLANDS OF THE COLUMBIA PLATEAU 625 



prows, pointing up the scabland's gradient (Figs. 2 and 3). The 

 nose of a prow may extend as a sharp ridge from the scabland to 

 the very summit of the hill. It is impossible to study these prow- 



Fig. 2. — An isolated loessial hill on the scabland south of Hooper. The prow of 

 the hill is pointed at the observer. The hill is 180 feet high, more than half a mile 

 long, has a very narrow crest, and sides which slope 35°. It is entirely surrounded by 

 scrubbed basalt. Half a mile to the west is a canyon in the scabland 75 feet deep, 

 with an abandoned waterfall at the head. 



Fig. 3. — The same hUl as shown in Figure 2. The prow is at the right. The 

 corresponding steepened slope at the tail of the hill shows at the extreme left. Most 

 of the apparent left slope of the crest is a matter of perspective. Photo by O. C. 

 CHfford. 



