46 GRIMES : MVINGYAN, MAGVVE AND PAKOKKU DISTRICTS. 



typical vertebrate fossils. From two localities, one south of Singu 



and the other in the Yaw valley west of Lanywa, I have obtained 



vertebrate remains, teeth and bones from this basal zone, from near 



Singu remains of Tetraconodon sp., Crocodilis or Guvialis sp., 



Trionyx sp. and Bos sp., and from the Yaw valley to the west of 



Lanywa, Dinotherium sp., Hipparion sp., Crocodilis or Guvialis sp. 



and Trionyx sp. 



In the southern blocks of the Yenangyat oil-field, and in the 



country south of Singu, some of the hills are 

 Recent beds. . : _' 



capped with a plateau gravel. On the 



Pakokku side of the Irrawaddi this gravel is lying on the up-turned 

 edges of the upper miocene beds, but on the Myingyan side it is on 

 pliocene beds. In blocks 18, 19, 20, 21 D, E, F and G of the 

 Yenangyat oil-field, where it is on the miocene rocks, the tops of the 

 hills are all flat and form a plateau, in which the streams have cut 

 the present nullahs ; this plateau is about 150 feet above the 

 Irrawaddi River, and so the gravel is at a lower level than that at 

 Yenangyaung. 1 As in other places it consists of rounded pebbles 

 of quartz, and pieces of fossil wood, in a red highly ferruginous 

 matrix. The size of the pebbles in the gravel on the southern end 

 of the Tangyi hills is not so great as in the gravels on the Yenan- 

 gyaung hills, which were described by Dr. Ncetling, but the gravel 

 on the other side of the river, in the country south of Singu, which 

 is apparently a continuation of that on the Tangyi hills, contains 

 pebbles and pieces of fossil wood as large and as well rounded as 

 any found near Yenangyaung. On the Tangyi hills this gravel is 

 only present along a narrow strip of country, which is bounded on 

 the east and south by the Irrawaddi, and on the west and north by 

 more lofty hills, and it is probably part of the bed of the Irrawaddi 

 or some other stream in former and post-Pliocene times. 



On the eastern side and around the southern end of the Singu 

 Hills, and on the east side of the Tangyi hills near Aingy and 



) Memoir, G. S., I., Vol. XXVII, Pt. 2, p. 59. 

 ( 46 ) 



