1861.] 
On the Sub- Himalayan rocks. 
29 
(Trans. Geol. Soc. London, Yol. Y. p. 267.) Indeed even the sugges- 
tions thrown out by him have not been followed up further. He 
pointed out that the connection between the subordinate range and 
the higher hills could be traced in the Nahun district, where the two 
were continuous without any intervening Dun, yet none of the many 
subsequent fossil-seekers seem to have adopted the hint. 
Capt. Cautley roughly divided tire whole series into three groups, 
without defining the extent of each ; the lowest, coarse clays con- 
taining reptilian and mammalian remains. 2nd, blue marl with 
freshwater shells, and 3rd, sandstones and conglomerates, which were 
the chief source of the larger mammalian remains. The true value, 
or even the correctness, of these sub-divisions Mr. Medlicott was not 
prepared to establish, but several facts point to a much wider differ- 
ence between the groups than Cautley supposed. Considerable fault- 
ing exists, and the rocks brought into junction by these faults, 
suggest some new facts. In the valley north of Nahun, thick soft 
grey lignite sandstones with subordinate beds of lumpy, gritty red 
clay are, by the great fault already noticed, brought into contact 
with a crushed rock of the Subathoo Nummulitic strata, and of the 
infra- Krdl shales. South of Nahun, where the Markunda extricates 
itself from the higher hills, the lower beds of the same series, in 
which clay predominates, are in junction, along a fault, with thick 
shingle beds of the outer Siwaliks, the topmost beds of the whole 
series, and in which the lower hills commence.* The Nahun rock is 
continuous along the hills bounding the north side of the Dun both 
to east and west. It is the lignite sandstone, the same as that noticed 
by Capt. Strachey as occurring below Nainee Tal, (from tiffs, the 
Decliouree iron-works now derive their ore) and it is also the Siwalik- 
like sandstone noted by Major Yicary, north of the Pinjore Dun. 
Capt. Cautley always considered these Nahun rocks as belonging to 
the Siwalik formation, but it does not appear that he identified them 
with the sandstones north of the Dun. 
* Tiffs fault, with the same rocks in contact, is easily followed through these 
hills intervening between the Kiai'da and Pinjore Duns for some forty miles : it 
can sometimes even be seen in the Duns close to the base of the hills on the 
