GEOLOGY. 



Crawford collected, and Buckland examined, a series of geo- 

 logical specimens of every rock seen from the delta of the Ir- 

 rawaddy to the mountains north of Sagaing ; from which it 

 appears that the Tertiary formation rests upon the transition, 

 or mountain limestone, and the intervening cod measures of 

 Europe are wanting. So far as the geoloay of these provinces 

 is known, there is an exact correspondence on this point. 

 We have Alluvium, Diluvium, Tertiary, transition or moun- 

 tain limestone, the Grauwacke formation, and Primitive, as in 

 Burmah ; and to complete the correspondence, we have a cal- 

 carious sandstone, which appears to be of the same age with 

 a sandstone, that Prof. Buckland referred with doubt to the 

 New R,ed Sandstone formation. 



UJSSTRATIFIED HOCKS. 



GRANITE. 



We step on shore at Amherst on granite, we meet with it on 

 Double Island, Callagouk, and the islands opposite Yay, and 

 from the mouth of Yay river to Tavoy Point the coast is one 

 unbroken chain of granite. Beyond the Point this rock again 

 appears, but is lost on the main land below the mouth of^Pai 

 -river. There is also granite on King's Island, and prebably 

 on some of the islands north of it. This granite wherever I 

 have observed it, is composed of quartz, mica, and felspar, the 

 latter usually white ; and sometimes in crystals an inch long, 

 constituting porphyritic granite. 



On traversing the provinces in the latitude of Tavoy, an- 

 other granite range is seen about fifteen miles east of Tavoy 

 river, which rises in some places two or three thousand feet 

 high, and which J have traced in a S. S. E. direction to the 

 vicinity of Mergui, and to the N. N. W. beyond the Burman 

 villages, where granite appears crossing the river. This, how- 

 ever, is rarely, if ever, porphyritic, but the crystals of mica 

 are often of considerable size, and the felspar frequently soft, 



