Remarks on the Geology of Tavoy. 363 



as the trees never come down to the river, I cannot speak 

 positively on this point. 



The accompanying specimens* exhibit the geological fea- 

 tures of the country between the Tavoy and Tenasserim 

 rivers, as they are seen in travelling from Tavoy to Mata. 



Tavoy stands on an extensive alluvial bottom of so recent 

 a formation, that where the river has washed away its banks, 

 the remains of imbedded fallen trees may be sometimes seen 

 jutting out several feet below the surface. In digging wells 

 twenty or thirty feet deep at Tavoy, a stratum of sand stud- 

 ded with pebbles of white quartz is usually reached. Pro- 

 ceeding east, a mile or more from the river, we reach Siam 

 hill, which stands like an island in the paddy fields, half a 

 mile in width by four or five in length ; the lower strata that 

 I have observed in wells near its southern extremity, resem- 

 ble those of the alluvial plain, as exhibited above in the 

 Tavoy wells, and where its northern point is washed by the 

 river at the village of Hsen-hseik, (handsome country,) the 

 sloping bank is strewn with boulders of white quartz, while 

 the precipitous descent on the eastern side, above the village 

 of Koy-man (broken point,) exhibits masses of which A and 

 A A are specimens. Passing across the paddy fields east- 

 ward, we reach Pga-than-khyoung, (snowfish brook,) where 

 from a ledge of rocks that cross the stream below high water 

 mark, the specimens marked B were taken. To rocks on the 

 surface of a small hill east of the village of Pyen-doung, 

 (Sagerstrcemia hill), the specimen C belongs ; while D and 

 D D were dug out of a low hill near its base, east of Tha- 

 bya-khyoung, (muscle brook) . At the fords of Pagayay river, 

 a ledge of rocks is seen below high water mark, from which the 

 specimen E was taken. The one marked d e is from a ridge 

 of hills some fifteen or twenty miles to the north, whose line of 

 direction seems to me to fall somewhere between D and E. 



* See list at the end of the paper ; the specimens enumerated corres- 

 pond with the letters on the map and in following description. — Ed. 



