122 THOMAS L. WATSON 



The absence of {a) definite arrangement or orientation 

 among the phenocrysts ; (d) of phenocrysts from the border 

 zones of the massif — gradation from an interior porphyritic 

 facies peripherally into an even-granular granite of coarse tex- 

 ture and the same mineral and chemical composition ; (<r) the 

 further absence of evidence of magmatic resorption or corrosion 

 of the phenocrysts ; and (d) the presence of abundant inclu- 

 sions of all the groundmass constituents, characterizing the gen- 

 erally tabular phenocrysts of the Georgia porphyritic granites, 

 fully justify the conclusion that the phenocrysts in these rocks 

 were formed in place, and are not intratelluric in origin. 



Thomas L. Watson. 

 Laboratory of the Geological 



Survey of Georgia, 

 Atlanta, Ga. 



