68 WILLIAM T. M. FORBES 



THE ANGORA DISTRICT 



In the neighborhood of Angora I first came across the confused 

 mass of rocks that seems to be typical of the igneous areas of Asia 

 Minor. We stopped some time at Angora, and a day at Ortakoi, 

 near by, giving rather more opportunity than usual to study 

 the conditions. The series that leaves the strongest impression 

 with one is a group of schists, extending roughly northeast and 

 southwest, alternating between dark schists with hornblende 

 or mica, sometimes very dense, and a very friable, whitish type, 

 which seemed to have talc or sericite for its foundation (a snap- 

 judgment, as there was of course no opportunity to go back). 

 Neither of these types had the superficial appearance of stratified 

 rock, but the relation of the two schists to each other and to the 

 limestone of Elma Dagh convinces me that they were originally 

 sedimentary. Tchihatcheff calls the whole system serpentine, 

 and considers it igneous. They were apparently interrupted by 

 a lava flow from Angora, southeast of the city where Tchihatcheff 

 crossed the Elma Dagh, but the clay-slates, "Thonschiefer," on 

 the road south from Angora, would seem to belong to the same 

 bed; at least they have the same relation to the limestone. 



I crossed the entire width of the schists, going a few rods north, 

 and three miles south, from Ortakoi. South of Angora the 

 Thonschiefer were of about the same width. 



The marble was traversed in two places, and was also noted 

 by Tchihatcheff about half-way between these two, giving a good 

 idea of it. It seems to form the whole crest of the Elma Dagh 

 and may extend quite a little farther at each end. Hamilton and 

 Tchihatcheff's notes would however seem to indicate that it is 

 limited by Jurassic sandstones to the southwest, and apparently 

 to the northeast also before reaching the Kyzyl Yrmak. Might 

 the coalbeds reported near Kalejik, on the Kyzyl Yrmak, belong 

 to the same system? To the north the schists were very soon 

 cut off by igneous rocks of various kinds, but Hamilton reports 

 both schists and limestones again north of them for some twenty 

 miles northeast from Angora. 



The most typical of the igneous rocks are the necks which 

 rise in Angora itself. These are of a reddish or purple trachytic 



