Reports d: Proceedings — Geologists Association. 231 



the Salt Range. " Where the foliation is of the nature of banding, 

 bands of potash may persist for some little distance, but even then 

 they will probably thicken and thin throughout their length. The 

 prospects of obtaining potash in the Salt Range are, therefore, not 

 promising, and it is not likely to be worked profitably except as a 

 by-product of salt-mining." In Koliat potash has been detected 

 in water drijDping from a dejjosit in one locality only, and there it 

 is condemned by its inaccessible situation. 



While carrying out his investigation of the economic value of the 

 potash deposits, Dr. Stuart made a number of observations on the 

 saline deposits as a whole, and these he has interpreted and embodied 

 in a most valuable paper on their origin and history. Briefly, it is 

 suggested that the rock-salt of Kohat and the Punjab belongs to 

 one great salt formation, and that the differences in character of 

 the salt exposed from place to place are due to the successive 

 exposure of different zones. The Kohat salt contains calcium 

 sulphate and belongs to one of the lowest zones. Various transition 

 zones are reioresented, until at Kliewra salt which may have belonged 

 to the kieserite- or carnallite-zone is encountered. It is impossible 

 to make a complete analogy between the Stassfurt sequence and that 

 of the Indian deposits, because the latter have been metamorphosed. 

 The existing dip and strike of the saline bands are probably not 

 those of stratification, but represent a foliation in a new and different 

 direction. The patchiness and lenticular form of the potash-bands 

 receive an adequate explanation, and the many puzzling phenomena 

 of sequence and structure are fully accounted for if Dr. Stuart's 

 views are correct. In the German and Alsacian deposits, M^hen potash 

 is once known at any horizon, it can be predicted with certainty 

 over a wide area, but in India '" no assertion can be made as to 

 where a lenticle of potash will occur, or as to its dimensions or shape 

 when located ". The prospects of obtaining potash from the Salt 

 Range are therefore, unfortunately, far from promising. 



Arthur Holmes. 



REPORTS AND PROCEEDINGS. 



Geologists' Association. 

 Fehruary 6, 1920. 



The President, Mr. J. F. N. Green, delivered an address entitled 

 " The Geological Structure of the Lake District ". 



General disposition. 



The Devonian concertina-folding. Manner in which it affects 

 various rocks. Cleavage. Passage in the main volcanic area from 

 zone of flow in the east to zone of fracture in the west, with con- 

 comitant disappearance of folds and development of thrusts. Con- 

 tinuation of the Devoke Water thrusts. The anticlinorium. 



