24 Mr. W. J. Hamilton and Mr. H. E. Strickland, on the Geology of 



pact basalt, resembling greenstone, traverses lacustrine limestone containing Palu- 

 dinse and Limnsese. 



Towards Taushanli these trappean rocks assume the character of a brown and 

 grey trachyte, and form some considerable hills. They were probably erupted 

 during the deposition of the tufaceous sandstones, which occupy the basin of 

 Taushanli as before described (p. 16), the materials of which were probably 

 ejected from the same craters in the state of ashes and cinders. 



(d.) In the valley of the Macestus are several outbursts of trachytic rocks. (PI. 

 in. Sec. 1)'. About two miles south of Susugherli a mass of compact porphyritic 

 trachyte stretches down from the hills on the west ; and half a mile further south, 

 at Tashkapu, is a considerable extent of white volcanic tufa, dipping slightly to 

 W.S.W., and forming a perpendicular cliff, around which the Macestus flows. 

 Hills of red trachyte with glassy felspar occur a mile to the south of Kebsit, and 

 again at Kalbourja, six miles further south. One of these hills, of a conical form, 

 rises far above the rest ; and on its south side is a deposit of stratified volcanic 

 sand and conglomerate, dipping S.W. and resting upon trachyte. A mile further 

 south is a very talcose rock resembling serpentine, much decomposed, and breaking 

 with an irregular, lustrous surface. These rocks rise in the midst of tertiary, 

 lacustrine limestone above described, which, on the south side of the trachyte, 

 is much disturbed, and is sometimes almost vertical. About three miles north of 

 Boghaditza the same limestone is again elevated and broken by the protrusion of 

 a small mass of igneous rock resembling a fine-grained granite. 



The largest mass of trachytic rocks in the valley of the Macestus, commences 

 on the south of Boghaditza (PI. HI. Sec. 1), and extends thence to the foot of the 

 Demirji chain. The northern part of this trachytic mass is of a greenish colour, 

 resembling that of the Bosphorus*. It contains veins of chalcedony, and is ac- 

 companied with a trachytic conglomerate. In one place, a large mass of contorted, 

 calcareous, thinly laminated marl is caught up in the conglomerate. Further south, 

 this trachyte varies in colour from white to green and red, and is mixed with an 

 angular conglomerate, which often presents a stratified appearance. On the east 

 of Singerli is a mass of porphyritic trachyte, with crystals of white glassy felspar 

 and hornblende in a reddish brown matrix ; and it much resembles the trachyte 

 of Smyrna. It flowed in a coulee from the hills to the S.E. 



The hot springs of Ilijah, described at p. 20, rise in these porphyritic rocks, 

 which extend about eight or ten miles to the east of Singerli. 



(e.) On the south side of the ridge of schistose rocks, between Azani and Ghiediz 

 (PI. III. Sec. 4), is an outburst of trachyte reposing on pumiceous sand and ashes. 



• See Geol. Trans., vol. v. p. 388. 



