62 WYNNE : GEOLOGY OF KUTCH. [pAET I. 



In Mr. Clark's interesting descriptive paper, just referred to, allusion 

 is made to ' particular vents' not connected with the basaltic dykes, as 

 these pass them at tangents and do not radiate therefrom ; unfortunately 

 these vents, or what may have been taken for them, are not described 

 fully, nor are their situations pointed out. The dykes themselves 

 do not appear to have been traced to termination ,in any particular 

 flows which might thus have been assumed to have issued from them. 

 Their numerous occurrence in a north and south belt traversing the 

 Konkan may perhaps have arisen from their occupying fissures connected 

 with the disturbance which has given the low easterly and larger 

 westerly inclination to the beds of trap, sloping from an axis coinciding, 

 it may be nearly, with the line of development of these dykes. 



The Deccan and Kutch volcanic region lies in the great volcanic 



Position in a great ^o^^^ extending from New Zealand through the 

 zone of volcanic action. g^^^^^^ j^j^^^ j^^^-^^ p^^.^j^ ^^^ Southern Europe on 



to Iceland, taking in the sites of submarine voleanos in the Bay of Bengal 

 Elevation and depres- ^'^'^ ^^ Mediterranean, and also several areas of 

 ^^°"' elevation and depression. Its situation, therefore, 



taken together with the connexion that exists between volcanic action 

 and changes of level may fairly warrant the supposition that this region 

 has been both elevated and depressed perhaps many times. There is 

 evidence of the geologically recent depression of the Maldive Islands 

 off the Malabar Coast; and there are traces of recent elevation and 

 depression further north on the Indian shore at Bombay.* Actions of the 

 same nature may have taken place at an earlier period ; and it may be 

 worthy of consideration whether the vast quantity of igneous materials 

 ejected, taken at 200,000 square miles by about a mile in thickness, would 

 be unaccompanied by some depression to correspond with or occupy the 

 vacant space. 



* Mem-, Geol. Snrv., India, on the Island of Bombay, by A. B. Wynne, Vol. V. 

 ( 62 ) 



