Scientific Proceedings, Royal Dublin Society. 



and crimson, gypseous, Salt-bearing marl. In their regular natural 

 order, the newest uppermost, these groups have been classified 

 thus :— 



Kainozoic-{ 



f 11. Siwalik and older, 



Sandstones and clays. 



^ 10. Eocene, Nummulitic 

 ( 9. Cretaceous, . . . 



Mesozoic - 



Palaeozoic- 



Chiefly limestone, with coaly 



beds at the very base. 

 Olive and other sandstones, 

 and boulder beds. 



8. Jurassic, Variegated sandstones and 



shales. 



7. Triassic, Eed flags, greenish shales, 



&c. 

 6. Carboniferous (and Per- Limestones chiefly, contain- 

 mian of Waagen) , . . ing the oldest known Am- 

 monite. 

 5. Speckled Sandstones, . Sandstones, shales, clays. 



4. Magnesian Sandstone, . Pale or whitish sandstones. 



3. Silurian, Dark, clunchy, sandy shale. 



2. Purple Sandstone, . . Sandstone, earthy below. 



1. Salt Marl, Ked gypseous marl and salt. 



Premising that this list is compounded from various sections of 

 the whole range, it will be observed that it includes no established 

 representative of the Devonian or Old Eed Sandstone period. 



Having thus briefly acquainted ourselves with some general 

 features of the range, we may turn attention to the recent very 

 interesting discovery of several determinable fossils by H. K. 

 Warth, Ph.D., in a thin layer of conglomerate occupying a posi- 

 tion near the top of the boulder-beds in the lower part of group 

 No. 9 of the foregoing list, and of others at the base of the over- 

 lying group No. 10. 



The locality which has furnished the fossils is in the eastern 

 part of the range, about a place called Pid, at some distance north 

 and north-west from the principal salt mines, named the Mayo 

 Mines (after our distinguished fellow-countryman, Lord Mayo, 

 whose brilliant career as Viceroy of India was brought to a melan- 

 choly close by his assassination at the Andaman Islands) . 



Many years ago Dr. Oldham found fossils just beneath the 



