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



the more modern plain in which the river now flows. Want of leisure prevented 

 us from searching for organic remains in this deposit, but the appearances, which 

 it exhibits, seem to refer it to the modern or newest tertiary epoch. 



B. — Igneous Rocks. 



§ 1. Granitic Rocks. (PI. III. Sec. I to 3, and 6.) 



Rocks of this class are rarer in Asia Minor than might have been expected in a 

 country where schistose formations of great antiquity and igneous rocks of a later 

 period are so largely developed. The only good example of granite which fell under 

 our notice, is in the peninsula of Cyzicus (lat. 40° 25', PI. III. Sec. 1). This moun- 

 tainous mass consists of a fine-grained grey granite, decomposing rapidly in con- 

 sequence of the felspar which it contains, and thereby producing a luxuriant soil. 

 It also contains large masses of hornblende or amphibole, and is sometimes tra- 

 versed by veins of felspar. 



This granite appears to have been elevated subsequently to the formation of the 

 schistose rocks, which dip away from it, at Erdek to the S.W., and at Aidinjik to 

 the S. and S.E. by S. (See Section 1.) The marble of the island of Proconnesus 

 on the north, has probably been elevated by the same mass of granite. 



From the occurrence of granite pebbles in the detritus at the north foot of the 

 Demirji chain, near Mumjik (lat. 39° 7', long. 28° 35'), we infer, that granitic rocks 

 exist in the higher parts of that lofty range. 



We have only to add on this head, that M, Texier, whose interesting researches 

 in Asia Minor are in course of publication, informed us, that he had met with 

 granite on the summits of Mount Olympus in Mysia, Mount Tmolus, and Mount 

 Latmus near the mouth of the Maeander. (PI. III. Sec. 2 and 3). 



§ 2. Greenstone, and older Trap Rocks. 



Igneous rocks, which can safely be referred to this class and period, are not of 

 very frequent occurrence in the western parts of Asia Minor. They were observed 

 by us at the following localities : 



(a.) The promontory of Bozbornou, north of the Gulf of Moudania, consists at 

 its western end of a greenish trap, sometimes forming rounded concretions, which 

 at a distance resembled an artificial wall (lat. 40° 35'). 



(6.) Immediately behind the town of Moudania a compact, green, trappean rock 

 appears above the surface, and its decomposition has in many places produced 

 a fine rich soil. This rock is however associated with tertiary strata, and is pro- 

 bably referable to a late epoch. 



