MEMOIRS 



OF 



THE GEOLOGICAL SURVEY OF INDIA. 



Geology of the Central Himalayas, by C. L. Griesbach, CLE,, 

 Superintendent, Geological Survey of India. 



PART I. 

 PHYSICAL AND STRATIGRAPHICAL FEATURES. 



Chapter I. — Introduction. 

 The ground which is described in the present volume may be rough- 

 ly defined as lying between the 78th and 81st 

 degrees of longitude, or between the Spiti valley 

 and the frontier of Nepal, and forms a narrow strip of sedimentary 

 rocks north of the chain of high peaks in the Central Himalayas. 



During my journeys to and fro to the regions of eternal snow, I 

 crossed the entire breadth of both outer and higher Himalayas within 

 the area above mentioned ; in the present memoir, however, I have 

 limited my descriptions almost entirely to the belt of sedimentary 

 rocks, which form, as it were, a high rim round the southern edge 

 of the great Hundes high-plateau. 



The area under description comprises the Bhot-mahctls of Kumaun, 

 GarhweLl, and of Tihri Garhwal ; the adjoining portions of the province 

 Gnari-Korsum (Hundes) of Tibet, the watershed between that country 

 and Bisahir and south-eastern Spiti. 



The accompanying two maps show the extent of the area report- 

 ed on, but as no reliable topographical maps of 



Maps. 



Hundes have been published, I had to omit part. 



B ( I ) 



Memoirs of the Geological Survey of India, Vol. XXIII, 



