14 GEOLOGY. 



hundred feet of the beds are seen on the side of a precipice, 

 the lowest of which is one of indurated slate clay, and above 

 that, a very thick bed of conglomerate composed of angular 

 fragments, as I judged, of the slate formation next below. 

 Some of the fragments of slate are several feet, not to say yards, 

 in cubic contents with their angles as sharp as if just bro- 

 ken from the rock to which they originally belonged. It should 

 be observed however, that while some of the fragments appear- 

 ed to be hard blue slate, many others were soft colored shales, 

 apparently of the same age as the formation itself. It contains 

 no boulders or fragments, so far as I could discover, older than 

 the slate. 



At the mouth of Moung khyoung there appears to be a fault. 

 A few hundred yards above the mouth of the stream, a hill 

 some two hundred feet high suddenly appears on the alluvial 

 bank of the river, with precipitous sides to the north and wc*t, 

 in which the strata are seen dipping down to the south. On 

 reaching the mouth of the stream the river is very deep, broad, 

 and fctilJ, and forms a small lake, and the strata again appear 

 in the side of a precipitins hill below the mouth of the stream, 

 dipping in precisely the opposite direction from that above, and 

 at a considerably higher angle, while a short distance below, the 

 hill disappears, and the strata are seen in the deep bank dip- 

 ping in the same direction, but in a much smaller angle, and in 

 the same direction, that all the strata below dip until reaching 

 the granite. A fault at the mouth of the stream might produce 

 these irregularities, by throwing down the ends of the strata on 

 both sides of it, but most on the northern side. Slate clay 

 containing alum, and granular gypsum are both found in this 

 neighborhood. 



On passing out of this basin, the claystone porphyry conglo- 

 merate is again observable for several miles ; then clay slate, 

 and that is succeeded for several miles by tertiary conglome- 

 rate, like indurated gravel, until granite is reached again in 

 about latitude 13° 40'. Clay slate is seen resting on the gra- 

 nite on the south side, and that is followed by a succession of 

 precisely similar rocks to those, that have been passed between 

 the forks at Mata and the granite. 



In about Latitude 13° 20', are some curious piles of limestone 

 resting on the claystone porphyry conglomerate, beneath which 



