496 L. Dudley Stamp — 



Padaung or Sitsayan Stage. 

 This stage seems to mark the period of greatest extension of marine 

 conditions during Pegu times, being still definitely marine as far 

 north as latitude 21° 6' (Dudaw Taung) or even to 21° 40' (West of 

 Myaing). The stage is characterized by Tritonidea martiniana, 

 and, towards the higher part, calcareous bands with Lepidocyclina 

 theobaldi. In the south this division is represented by the upper 

 part of the Sitsaj^an Shales with thick bands of Lepidocyclina 

 Limestone. The latter were sometimes, mistaken by Theobald 

 (1874) for Nummulitic Limestones — as in Henzada and at " Lime 

 Hill ", near Thayetmyo.^ Vredenburg believes that the lower part 

 of the exposed Pegu in the oilfields of Minbu and Yenangyat belongs 

 to this stage.^ 



Singu Stage. 

 Vredenburg has adduced evidence to show that the exposed 

 Pegu rocks in the Oilfields of Yenangyaung and Singu and the 

 higher beds in the fields of Minbu and Yenangyat are the equivalent 

 of the Prome Beds (Division A of Theobald) of Lower Burma. ^ 

 The latter are a sandy group about 1,500 feet thick. The faunas 

 of all the Pegu stages discussed up to the present are of distinctly 

 Oligocene character. 



Kama Stage. 

 A predominantly shaley group found in Lower Burma which has 

 recently yielded a magnificent series of fossils. The most fossiliferous 

 beds occur about 700 to 1,000 feet above the top of the Prome Beds 

 " A ". The fauna is distinctly Miocene, and corresponds to the 

 Gaj of Western India. This stage is probably represented by the 

 highest Pegu Beds with brackish-water fossils (Batissa) in the oilfields 

 of Upper Burma. The presence of the Miocene mammal 

 Docatherium in the higher part of the Pegu of Yenangyaung supports 

 this correlation. The '' Freshwater Pegu " above the beds with 

 Tritonidea martiniana in the Myaing region have yielded the lower 

 Miocejie mammal Cadurcotherium.^ 



Pyalo Stage. 

 A sandy group restricted to Lower Burma, which has yielded 

 numerous examples of Ostrea laiimarginata, a fossil characteristic 

 of the Upper Gaj of India. 



Akauktaung Stage.^ 

 Formerly called " Marine Irrawadian " by Stuart, and corre- 

 sponding to Theobald's Mogaung Sands. Yields Ostrea virleti, 



1 Cotter, Rec. G.S.I., vol. liv, pt. i, 1922 (in the press). 



2 Vredenburg, Rec. G.S.I., vol. li, pt. iii, 1921, pp. 224-302 ; Rec. G.S.I., 

 vol. liii, pt. iv, 1921-2, pp. 321-42. 



3 Pilgrim, Rec. G.S.I. , vol.xl, pt. iii, 1910, p. 197. 



* The existance of an unconformity below this stage as claimed by Stuart 

 is very doubtful. 



