﻿Vol. 64.] GEOLOGY OF BURMA. 613- 



Still farther north-westwards, in the Man choung near Subagyidan 

 (long. 94° 35' E., lat. 20° 4' N.), the north-easterly dips (20° to 35°) 

 increase to 65° and 90°, and then turn over to W. 30° S. at 56°. 

 On the crest of this anticline (evidently the same fold as that 

 described sonth-west of Thabyemyoung) occurs a ferruginous clay, 

 with beds of grey calcareous sandstone, yielding : — 



OpercuUna canalifera, D'Arch. 

 Am'pullina grossa, Desh., var. 

 spherica. 



Valuta 'pernodosa, sp. nov. 

 Fusus sp. 

 Turritella sp. 3 (?). 



East of the Man choung, and therefore at a higher horizon, near 

 the same locality, were collected: Voluta D'Ardiiaci, sp. nov., 

 Cassidaria sp., with poorly-preserved specimens of Tumtella (?) 

 and Voluta (7) and fragments of a lai,Tge 'CeritJiium, like that found 

 near Magyisan. Finally, at a horizon some 50 feet higher, occur 

 Aleciryonia Neivtoni, sp. nov., and Cardium ambiguum, J. de C. Sow., 

 with fragments of Ostrea. 



A pebble of grey calcareous sandstone was also picked up in the 

 Man choung, at a point some 2 miles north of Subagyidan, con- 

 taining OpercuUna canalifera, D'Arch., presumably from the horizon 

 already noticed on the axis near the village referred to. 



(c) Magwe and Myingyan Districts. 



No fossils were collected from the localities visited in these two 

 districts, but sundry points of stratigraphical importance were 

 observed in the Yenangyoung anticline and northwards. The 

 Miocene rocks cropping out in the Khodoung oil-field extend as far 

 south as the Sadaing Myouk choung, the mouth of which is some 

 4 miles south of the town of Yenangyoung ; and at this point, where 

 the Pliocene commences to occupy the crest of the fold, a section 

 was seen showing clearly the amount of unconformity that exists 

 here between the Miocene and the Pliocene. It does not appear 

 that much, if any, denudation of the earlier beds took place, except 

 along the very crest of the anticlinal fold. An inlier of Miocene 

 was also observed near the village of Tatkan (long. 90° 54' E., lat. 

 20° 37 J' N.), where again a slight unconformity was observed, 

 insignificant bands of ferruginous conglomerate immediately above 

 the base of the Pliocene apparently marking the place of the 

 thicker bed seen round the Yenangyoung inlier, already described 

 by Dr. Noetling. 



{d) Minbu and Pakokku Districts. 

 (Partly illustrated by the map, fig. 3, p. 614.) 



A journey in a semicircle towards the Arakan Yoma and back to 

 the Irawadi at Yenangyat yielded some interesting data. Leaving 

 the bank of the Irawadi opposite Sale, the road follows the course 

 of the Myenu choung, which here flows over Pliocene beds. These 



