462 



A. F. BUDDINGTON 



consist of dark greenish-gray fragments in dark reddish-, purplish-, 

 or greenish-gray matrices. 



Both basaltic and rhyolitic breccias exhibit approximately the 

 same range in the diameter of their fragments, from a fraction of an 

 inch to four feet (Figs. 7 and 8). The general run of the fragments 



,:::^^ o *i wwM ink 



\'^<A 



Fig. 8. — Coarse basalt breccia; west side of Blue Hills, south of Conception Bay 



would probably average a few inches in diameter. In general, the 

 rhyolitic breccias and the basaltic breccias contain few foreign 

 fragments, especially the coarser beds; yet beds in which angular 

 fragments of rhyolite and basalt and crystals of orthoclase and 

 plagioclase are mingled are frequent; and rhyolitic breccias and 

 basaltic breccias are often found interbedded. 



