URUOVICIAN SYSTEM: NYAUNGBAW LIMESTONES. 



110 



The new material from the upper Naungkangyi beds, now in 

 the hands of Mr. Cowper Reed (see list, p. 85), may possibly 

 lead to the establishment of a more definite relation between the 

 Ordovician of the Shan States and of China, when the collections 

 are examined. 1 



Nyaungbaw Limestones. 



Along the cart road from Mandalay to Maymyo, after surmount- 

 ing the outer scarp of the plateau above the 



Occurrence 



village of Kyetnapa (B 5), some red limestones 

 are found extending from about mile post 21 to within a mile of 

 the rest house at Nyaungbaw, disappearing, however, beneath the 

 Plateau Limestone before reaching that place. At the village they 

 are brought up again by a fault, and extend along the road beyond 

 Yemeye to the top of the steep ascent below Pyintha. On 

 this ascent they are well exposed, forming a dip-slope extend- 

 ing along the hill side to the north as far as the railway, where 

 it ascends the steep gradients between Zebingyi and Thondaung 

 stations. 



The first fossil discovered in these beds, indeed the first to be 

 _ ., found on the Shan plateau, was the peculiar 



Fossils. . A r 



organism collected by Dr. JNoetiing between 

 Yemeye and Pyintha (Loc. 71, B 5), and supposed by him to be a 

 gigantic species of E chinos phcerites, to which he gave the name of 

 E. KiiKji, in honour of the Director of the Geological Survey at 

 that time. 2 Dr. Noetling subsequently separated off the rocks con- 

 taining these fossils from the rest of the limestones of the Shan 

 plateau under the name of the Pyintha Limestone,3 but since it 

 has been found that his group includes rocks of different ages, it 

 has been thought advisable to confer the name of Nyaungbaw 

 Limestone, given to them in 1900,4 on these beds. 



1 While this Memoir was passing through the press. I was inlormed by Mr. 

 Hayden, Director of the Geological Survey, that he had discovered representa- 

 tives of the Naungkangyi group at Taunggyi, the capital of the Southern Shan 

 States. No determinable fossils were found ; but Mr. Coggin Brown, who is well 

 acquainted with the Naungkangyis of the Northern States, is convinced that the 

 beds belong to this formation. 



2 Vield Notes from the Shan Hills, Records, Qeol. Surv. hid., VoJ. XXIII. Vt. 2, 



p. 78. 



3 Coal-fields in the Northern Shan States; I hi. I, Vol. XXIV, p. 104. 

 * (ieneral iluport, Ucul. Hurv. hid., 1899-1900, |>. 82. 



