Notices of Memoirs — Exploration of the Rocky Mountains. 127 



coal-fields. These outliers were so long ago as 1853 pointed out by 

 the Geological Survey, but only recently the increased facility of 

 communication with Calcutta and the provincial towns, afforded by 

 the construction of a railway from Sitarampur to Lakki Serai, sug- 

 gested the possibility of working the coal. A further examination 

 of the rocks to determine this question shows, however, that, owing 

 to the poor quality of the coal and the limited area over which it 

 occurs, no successful competition with the Kurhurbari field could be 

 carried on. 



This Number of the Eecords contains two papers : — 



1. On the Geology of Mount Tilla in the Funjab, by A. B. Wynne, 

 F.G.S. 



This hill, which rises to the height of 3,242 feet above the sea, is 

 a very striking feature in the country, and mainly so through great 

 dislocations of the stratified rocks of which it is composed, whereby 

 beds of greater or less hardness are placed in abnormal contact with 

 others possessing different degrees of resistance to disintegrating 

 forces. The rocks include Tertiary (Sivalik) beds, Nummulitic 

 limestone, and beneath them a considerable thickness of calcareous, 

 shaly beds, and sandstones. The lofty portion of the ridge of Mount 

 Tilla coincides with a fractured anticlinal curvature of the strata, 

 while along its south-eastern side three, if not four, step-like faults 

 repeat some portions of the strata. This interesting structure of 

 Mount Tilla is illustrated by a Sketch-map and Section. 



2. Beports on the Copper Deposits of Dhalbhum and Singhbhum, by 

 V. Ball and Emil Stoehr.^ 



The copper ores occur for the most part in a zone of schists, 

 situated near the base of the sub-metamorphic rocks. These ores 

 have been repeatedly worked by the ancients, as numbers of old 

 excavations testify, and Mr. Ball is of opinion that the earliest 

 workers were an Aryan race called Seraks. 



In regard to the mode of occurrence of the copper, it seems 

 probable that in Singhbhum it occurs both in lodes and as a deposit 

 disseminated through the rocks. 



Two companies have of late years been formed to work the mines, 

 and both have failed. Nevertheless, the authors think that copper- 

 mining might be profitably carried out; but for that purpose such 

 colossal companies as these were not suited. H. B. W. 



III. — Geological Exploratioks in the Eocky Mountains, U.S.A. 



PEOFESSOE 0. C. Marsh, of New Haven, Conn., U.S.A., has recently 

 returned from an extensive tour in the Eocky Mountain region 

 for pal^ontological purposes, and has enriched the shelves of the 

 Geological Peabody Museum of Yale College with a crowd of mag- 

 nificent specimens, besides adding largely to the list of American 

 fossils. His party consisted of thirteen amateurs and students, 

 besides numerous guides and an occasional military escort. They 

 1 The Mining Geologist to the Singhbhum Copper Company. 



