254 



COL. T. ENGLISH ON THE EOCENE AND [-^Ug. I9O4, 



he characterizes the volcanic rocks in the Maritza and Arda Valleys 



generally as trachytes and tuffs. 



There are numerous volcanic outcrops in the near neighbourhood 

 of Keshan, including brecciated rhyolite and andesite, 

 olivine-basalt, hornblende- and biotite-andesite (see 

 Appendix I, p. 277). 



A small outcrop of basalt is exposed 3 miles north of liodosto, 

 and another about 12 miles north-east of this (3, p. 312); a detailed 

 survey of the country would no doubt reveal many similar exposures. 



In Asia Elinor are very many outcrops, sporadic and in belts, 

 in the country east of the Troad, which Tchihatcheff generally 

 classes as trachyte and basalt (7. passim). 



Fig. 3 



The andesitic /tills of Imbros, with a distant view of 

 Megdlai Kephalai (Sarmatic). (See pp. 254, 259.) 



South of Kamir, on the southern shore of the Sea of Marmora, 

 decomposed andesite or rhyolite and volcanic muds tone 

 appear at Arsali, silicified andesitic or rhyolitic tuffs 

 at Pekmeslu, and hornblende-andesites at Tchatal Tepe, 

 interstratified with Oligocene rocks. 



In the Southern Troad, Mr Diller has given particulars of 

 liparites, mica- and hornblende-andesites, augite- 

 andesite, and basalt, and considers that the eruptions have 

 continued from Eocene to Pliocene times. He also notices a well- 

 marked eruptive centre at Assos (Behram Iveui), not older than 

 Middle Tertiary (17, Prelim. Report, p. 179). 



In Mitylene, Prof, de Lauoay reports a more varied series than 

 at Lemnos, and considers that the following is the most prob- 

 able order of succession: — felspathic trachyte, rhyolitic 



