GENERAL GEOLOGICAL NOTES. 31 



the above rock is covered by a considerable thickness of alternating 



conglomerates and clays containing- occasional pieces of fossil wood — 



Feet. 



Mottled red and greenish sandy clay, with two or three irregular 



layers or nests of pebbles ... ... ... 20 



Conglomerate ... ... ... ... ... 25 



Mottled red and greenish sandy clay ... ... ... 2 



Conglomerate ... ... ... ... ... 4 



Blue sandy clay ... ... ... ... ... 5 



Conglomerate ... ... ... ... .. 10 



Mottled red and greenish sandy clay ... ... ... 10 



Blue sand; clay ... ... ... ... ... 5 



Mottled red and greenish sandy clay ... ... ... 5 



Conglomerate with two or three irregular layers of clay ... 6 



Blue sandy clay ... ... ... ... ... 15 



Conglomerate ... ... ... ... ... 4 



Grey and brown sandy clay ... ... ... ... 7 



Conglomerate ... ... ... ... ... 3 



Mottled red and green sandy clay ... ... ... 4 



Blue sandy clay ... ... ... ... ... 10 



Conglomerate ... ... ... ... ... 10 



Blue sandy clay ... ... ... ... ... 15 



Conglomerate ... ,„ ... ... ... 8 



Blue sandy clay ... ... ... ... ... 2 



Conglomerate ... ... ... ... ... 10 



180 



The conglomerate beds are composed of well rounded pebbles, vary- 

 ing in size up to some inches diameter, of fine-grained, rather hard sand- 

 stone, mostly greenish-grey in color, and identical in appearance with 

 the Naogaon sandstone of the Disang group. The pebbles make up 

 almost the entire rock, with but little matrix, although sufficient to 

 cement them firmly together. The various layers of conglomerate and 

 clay are rather irregular, varying rapidly in thickness, but are well 

 demarcated from each other. 



Below the section given, the beds are less clearly exposed, but similar 



alternations seem to extend as far as the coal conglomerate, perhaps 100 



to 200 feet in vertical thickness,, or 300 to 400 including the section 



( 299 ) 



