564 



THE GEOLOGY OF THE WARRUMBUNGLE MOUNTAINS, 



sonite trachytes were the earliest lavas and were in many cases 

 injected into earlier tuff cones. Their maximum development 

 was attained between Mount Wombalong, Berum Buckle and 



/ ^ /S/€l^cl//t 



'// 4v^ ^'*^'"^ 





sandy 



; '/y2//'^/^M///i;'r;,''\ soil 





v: 



/rit-., 



z' /r 



/ I 



'^ 



./ 



Fig. -la. — Plan of Scabby Kock (diagrammatic). 

 r, trachyte; s, slate; o-, sandstone; t, tuff. 



Mobara. Later flows of more basic lava followed, and this, 

 being of a more fluid nature, filled the valleys around the central 

 group and surrounded outlying members of the n>ore acid series, 



\9ooyc. 



Fig. 46.— Diagrammatic Section N. and S. through Scabby Rock. 



forming an extensive lava-tield sloping in all direction^ from the 

 central mass. Subsequent erosion has carved valleys through 

 this lava-field, reaching the sandstone below. The earlier arfved- 



