DEGCAN TRAP. 183 



vesielesj which gives the rock somewhat the appearance of a speckled 

 grit. 



North of tke Krishna, towards Bijapur, the undulating ground 



„ ,, , , shows much amygdaloid in the valleys and low 



Basalt and amygda- *'° •' 



line south of Bij^pur. grounds, wkile the intermediate ridges are capped 

 by a thin basaltic flow. The lowest flows seen near the Krishna are 

 all basaltic. Further east still, near Muddebihal and Talikote, the general 

 character of the trap is basaltic. 



Volcanic ash-beds were not met with numerously within the 

 southern parts of the Deccan trap area, though 



Volcanic ash-beds. 



doubtless more would have been made out had not 

 the exigencies of work rendered it necessary for the survey of much of 

 the trap country to be very cursory. Those noted were in the flanks of 

 Wallabgarh, and of that portion of the north Ghatprabha range between 

 Chikori and Wultur in south Kolhapur. Other beds were also observed 

 in the amygdaloid trap region at and south of Bijapur. At first sight, 

 the beds may easily be taken for amygdaloid flows, but a closer 

 inspection shows them to be made up chiefly of fragments, '' lapilli,^' and 

 dusty particles of vesicular trap, which are cemented together by the 

 deposition of calcite and zeolitic matter in strings and films between 

 the fragments, as well as in the vesicular cavities. The lapilli are 

 mostly of reddish or purplish color, and much red bole is difi'used 

 through the mass, which, by contrast with the whitish calcite and 

 zeolite, gives the whole a reddish or pinkish-grey color. 



Some of the argillaceous traps suggest the idea that they were 

 formed of exceedingly fine dust, subsequently semi-consolidated by 

 infiltration of clayey matter. 



At the base of a much-weathered earthy-looking mass of trap almost 



Enclosed fragments of ^^ contact with underlying quartzite, a few 

 older rocks. hundred yards west of Shengaon, in the valley of 



the Ved Ganga in Kolhapur State, numerous fragments, small and large 



( 183 ) 



