GEOLOGY. 



quartz rock ;" and where it appears in strata passing into in- 

 durated clayslate, it is nearly all silex. 



CLAY SLATE. 



Clay slate is usually the first stratified rock that rests on the 

 granite. In the province of Tavoy it is indurated in some 

 places so as to loose its slaty structure, and is a fine compact 

 rock, resembling blue limestone. 



MICA SLATE. 



Mica slate is seen at Amherst resting on the clay slate ; and 

 at Palaw, where the beds are much contorted, characteristic 

 of this rock, no clay slate was observed between it and the 

 granite ; but the point of contact was not seen. East of Tavoy, 

 thin beds of clay slate and mica slate alternate near the granite. 



PUDD1NGSTONE. 



On the banks of the Tenasserim, near the eastern base of 

 the mountains, in about latitude 13° 50 ; are immense masses of 

 puddingstone, consisting of water-worn boulders from a few 

 inches to a foot in diameter, firmly united together ; and form* 

 ino- what is often called transition puddingstone. 



Qcqoc£\ d — Kyouk-phong. 



SANDSTONE. 



Sandstone most frequently appears next above the primitive 

 slates, and then alternates with clayslate several times before 

 the limestone appears. In one place, however, a few miles 

 south of Toung-byouk river, red sandstone is seen resting on 

 the granite, no slate being present. 



When the stone contains red ochre, as on Siam hill near 

 Tavoy, the Burmese call it 



G 93?" — Kwe-nee. 



LATERITE, 



Laterite is seen lying above the slate at Amherst, and is 

 spread over the sea-coast nearly down to Yay, when the granite 

 appears again, and so far as my observation extends, it is seen 

 no more on the sea-board. In the interior of the southern 

 provinces some portion of the sandstone beds partake of the 

 laterite character; but it is not developed there as in An> 



