FOSSILS OF THE UPPER MIOCENE BEDS. 41 



Singu — was the whole thickness of the beds exposed in the mapped 

 country, and here I measured it as 2,450 feet. 



Fossils are not uncommon, and I have obtained them from several 

 localities, especially in the blocks to the south of Singu. They are 

 not, as a rule, scattered through the rocks, but are largely confined 

 to certain calcareous bands, rarely more than a foot thick, which 

 are crowded with shells- In places, however, shells or casts are 

 scattered through the shales, and a few casts of mollusca, some 

 sharks' teeth, the vertebra of a fish, and a few fragments of bones 

 were found in some of the sandstones. Most of the specimens were 

 obtained from five definite horizons, which are characterised by 

 certain species, but a few were found in intermediate beds, which 

 could not be definitely assigned to either of the horizons. Dr. 

 Noetling is examining the fossils I brought back with me from Burma, 

 but as yet he has only finished the Pelecypoda, of which he has 

 furnished me with the following lists ; there are also about as many 

 species of gastropoda, besides corals, etc. The following are the 

 horizons, with their pelecypoda, in ascending order : 



(1) Basal beds of Yenangyaung stage, resting on the 1st oil-sand 

 of the Prome stage. Most of the specimens obtained are casts, 

 which were scattered through the shales. 



(2) Shales just above and below the Signal hill sandstone, about 



350 feet above the base. These beds are characterised 



by a Cytherea. 



Cytherea, sp. no v. 

 Cardium, sp. nov. 

 Corbula semitorta, Boessg. 

 Tellina, sp. 

 Lucina, sp. nov. 

 Pecten, sp. nov. 



3. A band of argillaceous sandstone, mostly conglomeratic and in 



places calcareous, between 500 and 600 feet above the base. This 



is characterised by a Meiocardia^ and is the same as the Cypricardia 



bed of Dr. Noetling. 



( 4i ) 



