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



to the Cretaceous rocks of Britain. The tertiary strata which have since been 

 deposited around the bases of these mountains have undergone very httle dis- 

 turbance, and almost invariably retain their original horizontality. 



§ 3. Tertiary Marine Deposits. 



Deposits of this class are of small extent in Asia Minor, and appear to be en- 

 tirely confined to the vicinity of the sea-coast. We know of their existence at 

 only the two following localities in Western Asia Minor : 



(a.) The Troad. — The west coast of the Troad, and both shores of the Dardanelles, 

 consist of horizontal strata of light-coloured limestones and marls. We had no 

 opportunity of landing there ; but as Olivier gives the names of several species of 

 existing shells which he found in this deposit*, we infer that it belongs to the 

 Pliocene group. A sandstone with Pectines is stated by Fontanierf to occur in 

 Tenedos. 



{b.) The Island of Rhodes. — The N.E. end of Rhodes consists of a yellow, con- 

 cretionary, calcareous tufa, with beds of sand and gravel almost horizontal, and 

 full of tertiary shells, of which the genera Pecten, Cardium and Venus are the 

 most common. This deposit attains a height of 200 or 300 feet above the sea, 

 forming in many places hanging terraces resting against the steep sides of the blue 

 marble mentioned above J. (See Wood-cut.) 



w. 



Rhodes. 



Cliffs of shelly conglomerate and tuff. 



/- 



y^ 



Blue Marble. 



* Travels in the Ottoman Empire, vol, ii. ch. 2. f Voyages en Orient, vol. i. p. 9. 



X Mr. Hamilton also observed in the ruins of Tripolis ad Masandrum, nearly one hundred miles from 

 the mouth of the river, several large blocks of a shelly tertiary marine limestone, which could not have 

 been brought from any great distance ; but he did not observe the rock in situ. 



