﻿Vol. 64.] THE GEOLOGT OF BUEMA. 611 



westwards and south-westwards on the road leading to Kyauk- 

 myaiing village (long. 95° E., lat. 19° 50' N.). Near the latter is 

 the axis of an unsymmetrieal syncline with dips of 15° east- 

 wards and 53° westwards ; the latter increases eastwards to 80° in 

 about 100 yards, and half a mile down stream to vertical with 

 slight inversion, these features being well seen in section in the 

 Padi choung. The watershed of the Laungtahletaung range of 

 hills, between Kyaukmyaung and Yega (long. 95° 5' E., lat. 

 19° 51' N.), coincides with the axis of an anticline succeeding the 

 syncline just described, also seen in section in the Padi choung 

 near Sinmadaung village, where the dip eastwards is 71° at the 

 bottom of the section, and the crest is approximately horizontal, 

 with a sharp turn-over to 75° on the west. East of this anticline 

 the beds plunge under the Irawadi. ISTo fossils were collected 

 from these localities, where a uniform series of blue marls and grey 

 sandstones were seen ; but, on reorossing the Kyaukmyaung syncline, 

 the Miocenes are found continuously exposed, dipping at angles of 

 25° and upwards to N". 20° E. South-west of, and close to, the 

 village of Mindegyi (long. 94° 58' E., lat. 19° 48' N.), in a grey 

 sandstone dipping 15° to N. 30° E., were obtained specimens of 

 Sigaretus sp. and Terehra sp., Noetl. (?), the latter being previously 

 found only in the zone of Paracyathus cceruleus at Yenangyat. 



West of the village, the dips change again to westerly at an 

 angle of about 25°; and near the axis of this anticline, some 

 2 miles south of Mindegyi, the following species were found in the 

 blue shales: — Cantharus Martinianus, Noetl. sp. { = Cancellaria 

 Martiniana), and Nucula Alcochi, Noetl., indicating an horizon 

 equivalent to the zone of Cancellaria Martiniana at Minbu. 



About a mile and a half west of Mindegyi, a grey calcareous 

 conglomerate yielded poorly-preserved specimens of Geratotrochus 

 AlcocJcianus (?) Noetl., TurriteUa sp. 2, and Conus avaensis (?) Noetl. 



Proceeding westwards for some 4 miles, the village of Lehla is 

 reached : it lies in a syncline, dips being recorded a mile and a half 

 east of the village of 34 J° due west, and west of it, 19° and up- 

 wards to north-east. Finally, on the Minhla-Thayetmyo road at 

 mile-post 54 from Thayetmyo, some 3 miles west of Lehla, a fine con- 

 glomerate containing shells, including a small Fecten and Cassis (?), 

 was found, this horizon being apparently below any known fossi- 

 liferous zone in the ' Promeian ' : for, as will be seen from the 

 following observations, the Eocene boundary is at no great distance, 

 and there is apparently little or no unconformity here between the 

 older and the newer Tertiaries. 



West of the last-named point, the exposures seen gave dips of 20° 

 to 25° north-eastwards, and near Thabyemyoung (long. 94° 48' E., 

 lat. 19° 47' N.) specimens were collected of Ostrea yomaensis, sp. nov. 

 The surrounding shales include lenticular sandstones and, locally, 

 veins of mineral resin and coal. The easterly dips continue for 

 some 3 miles west of Thabyemyoung ; and then, after an increase in 

 angle through 35° and 50° to 69°, the beds turn over to south-west 



