146 Journ. of the Asiat. Soc. of Bengal. [May & June, 1915 
continuous series, and possibly the purer limestone bands har? 
been concentrated along fissures or zones of weakness. The 
proof that these beds have been so formed is naturally difficult, 
but there is much to suggest it. ; 
To sum up these remarks, we have in the Dharwi 
System in Mysore a great series of lava flows, sills, et¢., ant 
their crushed schistose representatives ; associated with these 
as sedimentary, but which may possibly be igneous. Ther® are 
also a number of subordinate bands or layers of more dis 
tinctly sedimentary habit, such as conglomerates, bande 
ironstones, quartzites and limestones which are almost univer 
sally regarded as of sedimentary origin, but which we 
Mysore are inclined to consider as formed from igneous Mav” 
by metamorphic and metasomatic changes. In some cases is 
is gtk ape for this, but conclusive proofs are diffi 
to a 
. 
many more instances will be required 
of actinolite or tremolite schists—amphibole-peridotites, 
tites : dunites with their alteration products pou : 
serpentine and magnesite. They appear to be sills, dykes B 
intrusive bosses in the mass of the schists and are re 
