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[VOL. X. 
Records of the Geological Survey of India. 
the Jurassic period. Shales, limestones, silieious breccia, hsematitic clays, and sandstones are 
present at Sirban; in other places limestones only are found, or with these a few shales, a 
sandstone band, or some ferruginous amygdaloidal clay. In one case I observed among other 
limestone rocks supposed to belong to this formation, a limestone conglomerate enclosing 
fragments of coralline limestone. The triassic beds are in force among the hills extending 
from the Mochpura mountains to the Trunk Hoad; and a quantity of hard limestone, much 
of which may be triassic, appears in the Chita range as well as in the detached hills to the 
north, 
The fossils of the formation are, as a rule, scarce, obscure, and hard to detach: 
Nerincea , Neritopsis, Astarte, Opis, Nuculce, Ledce, Ostrece, Terehratulm, Rhynehonellee, 
Megalodon, Dicerocardium, Chemnitzia and Gervillia were identified by Dr. Waagen at 
Sirban, aud Ostrea Raidingeri near Khairagali. At the western base of the Zyarut hill at 
Hassan Abdal I found a massive grey limestone bed uneonformable upon Attack slates, 
and full of large Dicerocardium, (and Gervillia '!) sections, the fossils being impacted and 
impossible to separate. Overlying this is a large zone of hard, thin-bedded limestones from 
which I obtained (loose) a very perfect Pholadomya. Sections of Rhynehonellee are seen in 
the rocks, aud on close search little Retzia ( i) and Echinoderms are found weathered out. If 
the fossils of the upper portion of these limestones prove Jurassic, the unconformity between 
the trias and Jura of Sirban is absent here. 
Thick, amorphous, splintery, nummulitic limestone of the paler hill-type caps the whole, 
and is compressed between the folds of the older beds, with very doubtful conformity to the 
thinner limestones below. In another section, near Kamalpur, of similar hard, thin-bedded 
limestone with some thicker bands, is a layer crowded with very large and thick Ostrece. 
The complicated association of limestones, trias, Jura, and nummulitic, extends 
westwards further than it can be followed into Affrfdi territory (Afghanistan). “Large fossil 
oysters” are reported from a stream near Cherat, and at Mtrkulan, not far from this place, 
there is the following succession, from south to north, a considerable part of which may be 
triassic: 
MirTculan Section. 
(North.) 
Dark Attock slates, with some harder bands. 
Fault (P). 
Upper Nummulitic. 
Bright red earthy rocks and soft greenish sandstone. 
Sandy limestone with large quartz grains. 
Olive shales. 
Strong purple sandstones. 
Very red earthy rocks, cleaved. 
Grey, slaty, olive and greenish shale, cleaved parts full of nummulites. 
Cretaceous (?). 
Alternations of slaty shale aud dark limestone with sections of Cerithium and 
Natica (?). Calcareous bands weathered to a rusty clay full of undetermin¬ 
able fossils. 
22. Thick limestone. 
21. Dark greyish-green, slaty band. 
20. Thin dark, flaggy limestones. 
19. Greenish and grey limestones, highly contorted. 
18. Thin-bcdded black limestone. 
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