378 DESCRIPTION OF THE COUNTRY BORDERING 



A short distance above the mouth a series of cascades fall through a narrow gorge. 

 The rock here (No. 151) contains a great deal of thalite. About three hundred 

 yards further up, a narrow ridge of No. 152 crosses the river, bearing north 45° 

 east. It rises fifty feet above the general level. 



Half a mile from the Lake, the upper rock (No. 153) mounts rapidly upward, 

 and is cut through by a gorge with perpendicular walls seventy-five feet in height. 

 The gorge is one hundred and fifty yards long, and generally from three to eight 

 feet wide, but at no place over ten feet in width. The rocks dip to the southeast, 

 at an angle of from 7° to 8°. As you ascend the stream, the gorge widens ; and 

 the numerous cascades, some of them with from ten to fifteen feet fall, soon bring 

 the river-bed nearly to the level of the shores. 



FALLS OP KAWIMBASII. 



Near the upper part of the gorge, the top rock (No. 154) rests on wrinkled beds, 

 such as have been already described as occurring on the lake-shore. They are five 

 or six feet thick here, and are underlaid by beds of amygdaloidal grit. 



