MINBU. 33 



As regards the palaeontological characters I am unable to say 

 more than a few words, because fossils are somewhat rather rare in 

 the neighbourhood of Minbu ; I have found numerous fragments of 

 bones, belonging probably to the same species of Trionyx which is 

 so common near Yenangyoung, imbedded in the conglomeratic beds 

 along the bank of the river, but they were too ill-preserved to be 

 specifically determinated. 



No attempt has been made to sub-divide this series, which 

 consists of certainly not less than 5,000 feet of sandstones, alternating 

 with conglomeratic or occasionally argillaceous beds. The monotonous 

 character of these beds, together with the scarcity of fossils, render 

 sub-division extremely difficult. In addition to this the country is 

 covered with a low but dense jungle which effectually hides all struc- 

 tural details. 



B. — The Miocene or Pegu series. 



While the pliocene almost completely composes the country around 

 Minbu the miocene crops out only within a small area along the axis 

 of the anticlinal arch. It is questionable whether the entire sequence 

 of the Burma miocene, namely, both the Yenangyoung and the 

 Prome stages are superficially seen. It is certain that the 

 Yenangyoung stage exists, but it seems doubtful whether the 

 Prome beds come to the surface, whereas they are unquestionably 

 developed in greater depth. 



Lithological and palaeontological characters. 



The strata of this series consist chiefly of olive coloured or 

 bluish clays and olive coloured rather soft sandstones, the latter 

 frequently contain layers of elongated sandstone concretions. 



The Yenangyoung beds have yielded a good collection of fossils 

 which I have described in a separate memoir. 1 As the geological 

 position of this fauna has been discussed in detail elsewhere 9 

 it would be superfluous to repeat my views, so recently expressed, 



1 Supra, pp. 1 -45. 



a The development and sub-division of the Tertiary system in Burma. Records of 

 the Geol. Sur. of India, 1895, Vol. XXVIII, p. 59. 



D ( 79 ) 



