﻿606 ME. L. T. DALTOX ON THE [Xov. I908, 



By the last-named author, the Tertiary rocks of Burma were 

 classified as under : — 



Series. Subdivision. Thickness 



in feet. 



Irawadi r Upper Irawadi Series. "I 90 000 



Series. [ Lower Irawadi Series. J ' 



r Pegu Dinsion I Yenangyoung Stage. 



5,500 



Series. 1 Bassein Division. 1,200 



[Chin Division. 10,000 + 



(1) Arakan Series. 



a) Chin Division. — This approximately corresponds with the 

 "Axial Series ' of Theobald, though to what extent is not exactly 

 known. In any case, it is certain that portions of it are, as we 

 have seen, Triassic and Cretaceous, while it may be, as suggested 

 by Dr. I^oetling, that it includes no Tertiary rocks. In view of the 

 supposed occurrence of Hcdohia Loinmeli north-east of Rangoon, it 

 is justifiable to presume that the Chin Division is represented there 

 also, though not recorded by any observer. 



(h) Bassein Division. — A series of impure fossiliferous 

 limestones, blue marls, and brown or grey sandstones, with 

 Nummulites, etc., and at the top a band (more than 10 feet thick) 

 of highly-fossiliferous red nummulitic limestone. Regarded as 

 Eocene. 



(c) Pegu Division. — Divided by Dr. Noetling into two sub- 

 divisions, Promeian and Yenangyoungian, the former (and lower) 

 being distinguished by its blue clays and grey sandstones from the 

 upper, where olive is the predominant colour. Correlated with the 

 Miocene of Europe. 



Yery few fossils are known from the Promeian, and these only 

 from one bed near Yenangyoung, although numerous species have 

 been collected from the Yenangyoungian, indicating two facies, one 

 brackish, the other marine. 



(2) Irawadi Series. 



The subdivision of this series suggested by Dr. Noetling is only 

 preliminary, no extensive examination having been yet carried out. 

 The group is considered by that author to be of Pliocene age and 

 equivalent to the Siwaliks of India, which it much resembles. 



(a) Lower Irawadi Series. — Yellow friable sandstones, with 

 bones and much fossil wood. 



(h) Upper Irawadi Series. — Sandstones similar to those of 

 the lower division, with no bones and less fossil wood. 



It is extremely doubtful .whether the thickness of this series 

 is as great as that suggested, but there are no data available for 

 correctins: the earlier estimate. 



