DECCAN TRAP SERIES. 49 



crystalline and arranged in seams and large nodular masses with ver- 

 tical or radiating structure, and they go wavering 

 More or less crystalline. _ , . 



about and tailing into one another, no beds but 

 (5) and (6) being very constant. 



No. 1 seam has always an even upper surface, but it is not always 



Thinning out of beds, present, the trap being sometimes in immediate 



and denudation. contact with the fossiliferous seam No. 2;— indeed, 



it sometimes happens that this latter bed thins out, and then No. 3 is 



overlaid by the chocolate clay No. 1. 



It is to me a matter of considerable doubt as to whether this choco- 

 late clay is not an accompaniment of the trappean outburst, rather than 

 a final deposit of the intertrappean band. It might have been a very 

 fine dust, and it is curious how its upper surface should be so worn. 



The upper surface of the layer No. 2, or the fossiliferous mud, is 

 uneven and shows gaps here and there, as though it had been subjected 

 to denuding forces prior to the overflow of the trap, or, at any rate, 

 to the deposition of the chocolate clay. 



There are cases in which the gieenish calcareous fossiliferous sand 

 is absent altogether, when at times the rest of the band is more or less 

 crystallized right through. 



The dirty-green calcareous mud is full of fossils, particularly Cerithi- 



um subcylindraceum, Vicarya fusiformis, Turritella 



pralonga, and a few small bivalves. Others, such 



as Cerithium stoddardi, C. leithii, Nassa, Corbicula, and (Jytherea, &c, 



are found in the more massive buff limestone below the mud seam. One 



specimen of Pliysa was obtained from the fossiliferous mud. 



The whole length of outcrop at Kateru is not more than about a quar- 

 ter of , a mile. 



There is no doubt that here in the Kateru area there is apparent 



alteration of the intertrappean beds from below 

 Apparent alteration of 

 beds from below up- upwards, that is, they are generally more largely 



crystalline and fibrous towards the bottom, and as 



is the case with the infratrappean beds, the strata nearest to the 



d ( 243 ) 



