270 Report on the Geological Structure of the Salt Range. [No. 3. 



branches of trees, and invariably in a horizontal position, affords 

 proof that they have been transported from a distance along with 

 the coarse materials forming the grits. 



No marine organic remains occur throughout these beds, which 

 are succeeded by others of undoubted marine origin, and differing 

 greatly in mineral character. 



b. Cherty thin bedded limestones with shales. 



The sandstones, &c. last described gradually acquire calcareous 

 matter, and pass into fine grained limestones of a cherty character, 

 varying in colour from nearly black, to a pale yellow. East of the 

 Indus, these beds are of little thickness and contain very few organic 

 remains. 



At Kalibagh and in the Chichalee hills they alternate with yellow 

 calcareous sandstones and dark bituminous shales and attain a thick- 

 ness of three or four hundred feet in some localities. 



Marine organic remains are abundant, particularly in the upper 

 limestones, and some of the intermediate beds are a mass of com- 

 minuted shells. 



Throughout the Chichalee Eange a very singular brown calcareous 

 bed occurs near the bottom of the series, in which small globules of 

 a bright metallic lustre may be observed mixed up with comminuted 

 shells. On treating a fragment of this rock with muriatic acid the 

 calcareous matter rapidly dissolves, leaving the globules in the form 

 of a coarse sand, the particles of which have a highly polished surface, 

 and have all the appearance of being the debris of hypersthene rock. 



No distinct oolitic structure prevails throughout the limestones, 

 which differ totally in appearance from those of the carboniferous 

 rocks. Some of them bear a close resemblance to the limestones of 

 the lias formation. 



They are hard and splintery and present a conchoidal fracture, 

 "When bruised, the darker varieties emit the odour of sulphuretted 

 hydrogen. 



They dissolve rapidly in muriatic acid, leaving a considerable 

 sediment of silica in flakes mixed with a little organic matter. They 

 contain a little carbonate of iron with a trace of alumina, but no 

 magnesia when undisturbed. At Kalibagh, however, where large masses 

 of the limestone repose on salt marl, they have a remarkably shivered 



