THE 



QTJAETERLY JOUENAL 



THE GEOLOGICAL SOCIETY OF LONDON. 



PROCEEDINGS 



OF 



THE GEOLOGICAL SOCIETY. 



January 6, 1847. 



[Continued from No. 10.] 



3, On the Neighbourhood of Bombay, and certain beds containing 

 Fossil Frogs. By G. T. Clark, Esq., C.E. Communicated by 

 the Very Rev. the Dean of Westminster. 



The island of Bombay is composed of five or six bands of trap rock, 

 chiefly greenstone and amygdaloid, conformable, and dipping west at 

 about 1 0° or 1 5°, and separated by beds that have every appearance 

 of being of sedimentary origin, though there is no actual proof of the 

 fact. The highest and most western of these beds have been laid open 

 in some engineering operations, and in these the fossils sent to the 

 Society have been found. 



The batrachian beds are a mass of blue rock, weathering into a shale 

 not unlike ordinary coal shale, and containing what I have no doubt 

 will turn out to be vegetable impressions. The upper beds are inter- 

 stratified with thin seams of sandstone and argillaceous rock, and 

 over the whole is a mantle of basalt which cannot have been less than 

 70 feet thick. This basalt has in parts caused imperfect fusion 

 of the fossil beds, obliterating their stratification and superimposing 

 something of its own columnar, or at least prismatic structure. 



VOL. III. — part I. R 



