﻿616 HE. L. V. DALTON 0^^ THE [NoV. I908, 



and a mile and a half north of Lanywa, which is 9 miles south of 

 Tenangyat, Cassidea acantJiina, sp. nov., also Natica obscura, Sow., 

 possibly from the zone of Paracyathus cceruleus. A mile farther 

 south, TurriteUa sp. 1 and a large Natica occur in coarse shelly 

 sandstone at a slightly -hisrher horizon. 



(e) Pakokku and Lower Chindwin Districts. 



In the northern districts, as has already been noted, the Miocene 

 deposits appear to be, for the most part, uufossiliferous, so that the 

 observations made under this head are mainly of a stratigraphical 

 nature. The country north of Pakokku, for about 25 miles, consists 

 of approximately-level ground with but few elevations, the whole 

 rising gently from the river northwards. These plains consist of 

 the characteristic soft yellow or white Pliocene sands, with patches 

 of red alluvial gravel ; pieces of fossil wood are also of frequent 

 occurrence. North of Myaing, some 25 miles from Pakokku, a 

 range of hills covered with a low scrub rises from the plain with a 

 north-north-westerly strike ; the Pliocene sands dip at high angles 

 away from the hills on the west, and are underlain by a coarse 

 conglomerate forming the western slope of the range, the dip of 

 this being about SO'^. The pebbles are of large size, ranging up to 

 6 inches or more in length, and the whole aspect of the rock is 

 unlike those above it, the matrix being darker in colour, and 

 possessing in every way rather a Miocene than a Pliocene aspect. 

 Leaving this range on the west side, the high dips are found to 

 prevail in the Pliocene for half a mile across the strike, after which 

 no exposure was seen until 2 miles away from the range when tlie 

 dip had decreased to 15°, and at about 1 mile west of Taungzon 

 village (long. 94° 43' E., lat. 21° 40' N.) rocks of the same series 

 were found dipping 10° north-eastwards ; while a mile and a half 

 west of Taungzon, Miocene shales were found to succeed the 

 Pliocene (though the boundary was not seen) with relatively low 

 easterly dips, becoming violently contorted to the west for a short 

 distance near the crest of an anticline of the Miocene, which has 

 low dips again westwards. The Miocene sandstones of this 

 locality are, like those of Yenangyat, inclined to be conglomeratic, 

 although the pebbles are not so large as those seen near Myaing. 



lieturning to the Myaing range, the same high dips are met with 

 some 4 miles north of Myaing, and the eastern dips (for the range 

 is anticlinal in structure) are even steeper, the characteristic 

 Pliocene being noticed, apparently horizontal, at a mile east of the 

 range ; while some 8 miles north of Myaing the same fold had dips 

 of 43° on the west and 55° on the east side. At the last-named 

 point, the limit of the ' dry zone ' of Burma is reached, this ap- 

 proximately coinciding with the boundary between the Pakokku 

 and Lower Chindwm districts; and here, as elsewhere in the jungle- 

 regions of Burma, it is possible to distinguish at once by the 

 vegetation whether one is on Pliocene or on Miocene rocks. Teak 

 and bamboo are the rule on the latter, eng-daing forest with stunted 



