GEOLOGY". 



CROSS SECTIONS. 



FROM MONMAGON TO THE TF.Sf ASSERIItf. 



Were a person to land at Monmagon, opposite the middle 

 IVJoscos, and proceed across the province of Tavoy to the Te- 

 nasserim, and down that river to the highest point where 

 Dr. Heifer found coal, he would see on the way nearly every 

 rock that has been discovered in the Provinces. At Monma- 

 gon granite rocks appear below high water mark, and thence 

 to the base of the range of hills that separates the valley of 

 Tavoy river from the sea, is a sandy plain a mile across, which 

 seems to have been originally covered by the ocean. The 

 hills from the base to the summit arc granite, rising at the 

 right of the road to fourteen hundred i'eet high, as measured 

 by Capt. Glover. 



On the eastern declivity greenstone slate shows itself, and 

 thirty miles further south, there are granite and greenstone down 

 to the bank of the river. On descending the hill however 

 from Monmagon, a well has been dug at its base, and from 

 the bottom of the well a soft friable white stone brought up, 

 which Baron des Granges said was " green sandstone, much 

 decomposed — cretaceous group." The accuracy of this state- 

 ment may be well doubted from the Geological position of the 

 rock, but it is quite a peculiar sandstone, and I have not seen 

 any thing exactly like it in any other place in the provinces. 

 It bears some resemblance to very fine granular quartz. • 



Clayslate next appears, and continues to the banks of Tavoy 

 river. In some places a kind of iron stone is seen, and a 

 short distance noith of the road there is a hill composed al- 

 most entirely of magnetic iron ore, while the bottom of a 

 well in the vicinity, is floored with Tremenheerite. 



After crossing Tavoy river there is an. alluvial plain, one or 

 two miles broad to Siam Hill, where a red conglomerate ap- 

 pears, bearing a strong resemblance to the laterite of Am her si 

 province, and on its eastern margin is an igneous or altered 

 rock, abounding in amygdaloidal cavities and pyrites A pre- 

 cisely similar rock, but with less iron pyrites, is seen in the la- 

 terite at Moopoon This i? succeeded by an alluvia! plain, bur 



