686 JOURNAL, BOMBAY NATURAL HIST. SOCIETY, Vol. XXVII. 



from point to point. In general the lighter material occurs in thicker layers than 

 the darker one and is more resistant to splitting. It is very difiScult to get 

 thin slabs of it. The alternation of the layers sometimes is very rapid thereby 

 producing very thin bands. There are large deposits of carbonaceous shale, 

 but the remarkable fact about it is that the shale is not found in continuous 

 layers, but occurs as pockets In the other deposits. 



Fossilized Frogs from the sedimentary deposits. 



The general description of the beds which are about 30 ft. thick is more or 

 less as follows : — Immediately resting on the lower trap there is a layer about 

 3 or 4 inches thick of a very dark coloured shale in a good state of preser- 

 vation which spUts into very thin laminae. It consists of an extremely fine 

 sediment, so fine that when held against the sunlight it gives out iridescent 

 colours. When wetted and exposed to the sun it emits a strong smell of 

 naphta. This is more pronounced in a newly broken rock and the quarrymen 

 are quite aware of it. This naphtous smell is probably the result of the large 

 amount of organic matter incorporated in the shale. This layer is the most 

 prolific in frog impressions. On both the faces of a small slab about | inch 

 thick there are no less than 3 clear and several faint impressions of frogs. 

 The counterpart of this slab was welded to the lower trap and could not bs 

 detached. 



Above this layer comes a deposit of a coarse grey coloured detritus about 

 12 inches thick. This layer does not easily split into thin laminae ; but where 

 it does, it is possible to get impressions of frog fossUs. The grey deposit is 

 followed by fine sediment similar in appearance to the first layer, but in rather 

 a decomposing state. If spUt into thin layers it easily crumbles into bits. It 

 is prolific in frog fossils and together with the previous similar deposit are 

 the only layers in which pecuhar impressions are found. 



After this period the character of the deposits changes. Sediments of any one 

 kind are in some cases heaped up several feet thick. This is especially true 

 of the ashy grey deposit. It is pecuhar in containing very thin flaky pebbles 



