104 
HAYDEN : GEOLOGY OF SPITIi 
writer, vi2., Spiti, and the immediate neighbourhood of Simla, and 
any observations which may appear to run counter to the generally 
accepted views are put forward with diffidence and chiefly with a 
view to drawing the attention of future w^orkers to certain points which 
appear to have hitherto escaped notice and which may help eventually 
to elucidate this difficult problem. 
The earliest attempt at correlation was made by Stoliczka, who iden- 
tified the hi/ra-B\ain\ beds (Simla slates) with the upper part of his 
Bhabeh series, i.e., with the beds regarded in this Memoir as of 
middle and upper cambrian age. 
The Blaini boulder slate he correlated with the lower part of his Muth 
series, the Blaini limestone with the "arenaceous limestone" of the 
same series, and the Boileauganj quartzite and schists with his " Ruling 
series "; while the Muth quartzite he believed to be represented by "a 
small thickness of a whitish quartzose schist " above the Blaini limestone. 
Adopting Mr. Oldham's classification of the Simla beds as pub- 
lished in Records, vol. XX, we obtain the correlation shown in the 
following table : — 
Simla (Oldham). 
Spiti (Stoliczka). 
Jutogh carbonaceous slates and 
limestone. 
Boileauganj quartzites and schists. 
Lower carbonaceous slates. 
Killing series (permian and carboni- 
ferous of present memoir). 
Muth quartzite ( = ? devonian). 
Blaini limestone. 
Arenaceous limestone ( = partly upper, 
partly lower silurian). 
Upper boulder bed. 
Bleach slates. 
Lower boulder bed. 
Lowest beds of Muth series ( =■ lower 
Silurian). 
In/ra-Blam beds. 
Upper Bhabeh series ( = upper and 
middle cambrian). 
( '04 ) 
