82 



HAYDEN : GEOLOGY OF NORTIIEEN AFGHANISTAN. 



While the eastern facies belongs to the Himalayan and Indian 

 Province, the Northern finds its counterpart in Russian Turkistan. 

 There is no evident relationship between the older systems of the Hindu 

 Kush and Koh-i-B;iba and the co mplex of igneous rocks and crystalline 

 schists (altered sediments) that Krafft found below the Fusulina lime- 

 stone of Darwaz, but further north the pre-Devonian rocks of the 

 province of Syr Darya recall the Kdlu series and associated beds of the 

 Hindu Kush and Koh-i-Baba ; I quote Weber's description (33, 396) : 

 te . . .on observe aussi des depots du devonien . . . . et une assise plus 

 aucienne de gvbi et conglomerate depourvu? de fossiles. Le long du 

 faite de partige des eaux on observe un developpement de schistes 

 metamorphiques egalement sans fossiles, se rapportant peut-etre au 

 carbonifere ou au devonien". 



Above these in the region of Syr Darya are Devonian limestones 

 with Spirifer Femcuilii and other fossils, followed by Lower Carboni- 

 ferous limestone passing up into and alternating with porphyry and 

 tuff. These again are overlain unconf ormably by J urassic grits with 

 lignite. The resemblance of the whole of this sequence to the strati- 

 graphical facies of Northern Afghanistan is very striking. The only 

 discrepancy is the apparent absence from the latter area of any repre- 

 sentative of the Upper Palaeozoic volcanic series of Syr Darya, Darwaz 

 and Kashmir and the similar absence of the Doab series from the 

 former. 



BIBLIOGRAPHY. 



1. 1903. Bronnikow, M. — Compte-rendu preliminaire sur lcs reclierches minieres du 



lignite dans le Ferghana Bull. Com. Geol., St. 

 Petershourg, XXII, 15. 



2. 1905. n — Recb.erch.es geologiques faites en 1904 dans la province 



de Syr-Daria. Id. XXIV, 401. 



3. 1907-03. Burrard, S. G., and Hayden, H. H.— The geography and geology of the 



Himalaya Mountains and Tibet. 



4. 1910. Diener, C— See General Report of the Geological Survey of India fur 1909, 



by T. D. La Touchc. Sec, Geol. Surv. India, XL, 88. 



