294 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



PART II. 



Contents. 

 Introduction. 



Section between Senna and Lahijan. '' ^ 



. Kel i Shin Pass. 

 Section from U'shiiu to Mergaver. (Fig. 14.) 



between Urumia and Gawar. (Fig. 15.) 



from Beradust, across the Plain of Selmas, to Derik. (Fig. 16.) — 



Travertin Springs of Derik. 



from Selmas to Guverjin Kalah, on the Lake of Urumia. (Fig. 17.) 



Lake of Urumia. 



Section from Selmas to the Plain of Kho'i. (Fig. 18.) 



from the Plain of Khoi' to Van. (Fig. 19.) 



from Van to Mount Ararat. (Fig. 20.) 



. from Bayazid to Ardish. (Fig. 21.) 



Lake of Van. 



Sections from Ardish to Jezireh-ibn-Omar. (Figs. 22, 23.) 



Conclusion. 



[Figs. 14-23 are to be found at pp. 335-344.] 



Introduction. — In the former part of this paper I have endea- 

 voured to describe the order of succession of the various forma- 

 tions, which prevails in the southern portion of the Frontier, where 

 less contortion in the deposits is exhibited than is observable further 

 to the north. 



In continuing the subject, it is impossible to enter into such detail 

 as hitherto, owing to the rapidity with which the latter portion of 

 the frontier was traversed. I shall therefore briefly allude to such 

 road-sections as may be considered of interest. 



Between the Derbend Khani on the Shirwan, and Ushnu near 

 the Lake of U'rumia, I had no opportunity of making investigations, 

 having been detached from the Commission during the progress of 

 the Survey between those localities. While en route to rejoin the 

 party I was attacked by a severe fever, which incapacitated me 

 from giving proper attention to the geology of the country between 

 Senna and Lahijan. 



The following rough notes, however, concerning this tract may not 

 be uninteresting : — 



Between Se?ina and Lahijan. 



On quitting Senna the road gradually ascends along the north 

 slope of the Kiih A'b-i-der, crossing numerous slate-spurs which 

 shoot out from the mountain. After an ascent of two hours and a 

 half, the summit of the range is at length attained by the A'rriz 

 Pass. An uninviting sea of barren and ferruginous undulations is 

 seen extending over a vast elevated plateau, from whence the numerous 

 sources of the Shirwan have their rise. The stratification consists 

 of highly fissile blue schists, passing upwards into thin altered beds 

 of blue limestone, weathering rusty-brown ; the prevailing dip being 

 to the N.E. Far in the west, the lofty A'vroman range of igneous 

 rocks rises boldly from beneath the schists. After two long days' 



