586 CONGLOMERATE ROCKS. 



of the second division, and occurs in the same 

 places. 



. Fragments of various primary rocks, or of 

 secondary rocks, or of both, with fragments of trap. 



This is a trap conglomerate of recent origin, 

 analogous to var. G, first division. 



Organic remains are found in some of the 

 conglomerates, but only in those of the most 

 recent origin : seldom in those of the lowest sand- 

 stone series. Bituminized wood, as already 

 noticed, occurs in those which contain fragments 

 of the trap rocks. 



The finer conglomerates of some of the preced- 

 ing varieties, both primary and secondary, have 

 also been distinguished by the term grey wacke*, 

 and are noticed under the head of argillaceous 

 schist. 



