64 WILLIAM T. M. FORBES 



same period also are several local deposits of sandstone and con- 

 glomerate. These are cut by the railroad near Hammam and 

 elsewhere; they form the basis of many of the sculptured rocks 

 of the country. More frankly volcanic are the white tuffs of 

 Ayaz In, and the lava mesas which make a dominant feature of 

 the landscape east of the railroad, and all about Yazili Kaya. 



The lacustrine gravels of the Sakaria Valley approach quite 

 close to Yazili Kaya on the east and mark the northeastern bound- 

 ary of Mountainous Phrygia. 



As reported by Tchihatcheff and Hamilton the region south of 

 the author's route is of the same character, but the dominance of 

 igneous rocks becomes less. The conspicuous volcanic necks of 

 Afiun Kara Hissar are well described by Tchihatcheff and others. 



THE SIVRI HISSAR RANGE 



Passing over the lacustrine plains of the Sakaria River for the 

 present, we reach the next point of interest in the Sivri Hissar 

 Mountains, conspicuous among them Kodja Bel. At this place 

 the stratified rocks would seem to belong to the same group as 

 those in Phrygia, but the core of the range is a granite (a syenite 

 in the popular sense of the word, as it is a fine-grained granite 

 with little or no mica). East of Bala Hissar there is an area of 

 limestone on the very top of the range, surrounded on both sides 

 with the syenite, apparently lifted up on top of it. Near the city 

 (Sivri Hissar) there is a complex of metamorphic rocks (schists 

 and gneiss), through which the road passes on the east side of the 

 mountains. Kodja Bel, a conspicuous peak southeast of the 

 city, and the Kaimas peak to the northwest, seem to be similar. 



Tchihatcheff has reported on the northwestern part of the 

 range; conditions are essentially the same, an alternation of 

 syenite (granite) with various metamorphics. 



GORDIUM AND POLATLY 



The neighborhood of Polatly, unlike the preceding localities, 

 has fossiliferous rocks, making it possible to fix this district as 

 Eocene. Nummulites are the dominant feature, as elsewhere 

 in Asia Minor eocenes. 



