GEOLOGICAL EXPLORATION OF LEW CHEW. 



No. 2. 



55 



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No. 2 is a view of this most singular limestone rock, as it stretches in a narrow ridge across 

 the island, in a course about N. 60° E., commencing twelve miles from Napha. This view is 

 from its northwest side; and, strange as it is, may he depended on for accuracy, as it was care- 

 fully made. This rock is highly crystalline, is full of marine petrefactions (generally small), 

 and is vesicular to an extraordinary degree. It seems as if, when the rock was yet pasty, a vast 

 quantity of gas had been disengaged, which not only caused these vesicles, hut also forced its way 

 through the superincumbent earth ; thus creating sharp, pinnacle-shaped vacancies above, into 

 which moulds the puffed-up rock was forced by the gas. The surface is generally blackened by 

 time ; but a fresh fracture shows a yellowish-white color. Many of the sharp pinnacles, when 

 struck, give a ringing sound. 



No. 3. 



No. 3 is a view of the same kind of rock at Abbey Point. 



