﻿Vol. 64.] GEOLOGY OP BUEMA. 619 



number of specimens of Turritella acuticarinata found therein, to 

 be fitly called the zone of that fossil. An objection to this nomen- 

 clature is found, in that Dr. Noetling's hypothetical zone of T. acuti- 

 carinata is at the top of the Pegu Stage in Lower Burma. Since, 

 however, the fossil Turritella reported as occurring in the upper 

 portions of the series may equally well, according to Dr. Noetling,'- 

 be T. simplex^ and since T. acuticarinata is more nearly allied to the 

 Eocene species, T. fasciata, Lamk., it seems possible that the higher 

 zone should be that of T. simpler ; while this, 250 feet below the 

 horizon of Ci/therea erycina^ should be the zone of T. acuticarinata.^ 



The small Pecten and other fossils, mentioned on p. 611, indicate 

 a yet lower fossiliferous horizon near the bottom of the Miocene ; 

 but the exact position of this is not known. 



The division has been studied at several new localities, which 

 have yielded interesting data. Thus, it is of interest to find what 

 appears to be the zone of Paracyathus cceruleus near Toungu (south- 

 west of Minhla), and at a similar horizon south-west of this, the 

 characteristic fossil of the zone of Cancellaria Martiniana, the first- 

 named occurring at Yenangyat, the second at Minbu, while here 

 the two horizons approximately correspond : one locality yielding 

 fossils found previously in either, but not both, of the zones. It 

 is convenient to note here that it would seem that the form described 

 by Dr. Ncetlmg as Cancellaria Martiniana must be referred to 

 the genus Oantharus, and consequently the zone now becomes 

 that of Cantliarus Martinianus. It is noticeable that near Toungu, 

 where beds at approximately the horizon of the zone of Paralleli- 

 pipedum prototortuosum are dipping eastwards at high angles. 

 Pliocene sands form the upper portion of the neighbouring hills, thus 

 indicating a considerable unconformity in this j^art of the country 

 between the two series. The occurrence here of a fossil peculiar 

 to the zone of P. prototorttiosum^ previously only found at Kama to 

 the southward, is of interest. 



A second new section of the Miocene now described is that 

 visited in the Yaw Basin, towards Sawmyo, where the occurrence 

 of an horizon corresponding to the zone of Meiocardia metavulgaris, 

 previously known at Singu, and of Batissa Jcodoungensis some miles 

 north of it along the strike, hitherto known only from one horizon 

 south of Yenangyoung, has already been mentioned (p. 615). 



Pinally, the conglomeratic nature of the Miocene rocks of the 

 Lower Chindwin and other northern localities, with their inclusion 

 of plant-remains, presents a feature pointing to the derivation 

 of their material from no great distance to the northward, and 

 indicates the existence of a Miocene estuary in this 

 district corresponding to that of the Irawadi of to- 

 day, although far to the north of it. 



These investigations may also throw some light on the two 



1 Palaeont. Indica (Mem. Geol. Surv. India) n. s. vol. i, no. 3 (1901) p. 26. 



2 [Data with which I have recently become acquainted seem to indicate that 

 T. acuiicariyiata occurs in abundance at more than one horizon in the series.] 



Q. J. G. S. No. 256. 2 t 



