96 PROCEEDINGS OF THE AXX ARBOR MEETING 



TITLES AXD ABSTRACTS OF PAPERS OF GROUP C AND DISCUSSIONS THEREON 



METAM0RPHI8M OF QLARTZITES BY THE BUSHYELD IGXEOIS COMPLEX 



BY FRED. E. WRIGHT 



(Ahstract) 



In this prelimiiiaiT paper the results of a field study of the changes produced 

 in quartzites metamorphosed by invading magmas of the Bushveld igneous 

 complex are given. The changes effected by granitic magmas are noticeably 

 different from those produced by noritic magmas. Several series of specimens 

 illustrating these differences, the formation of magmatites with abundant 

 feldspar, on the one hand, the solution and recrystallization of the quartz 

 grains to large individuals one to two inches across without the addition of 

 much extraneous material on the other. The problems offered by these rocks 

 can only be solved by combined field and laboratory study. This problem was 

 selected as of the type suitable for attack by the Geophysical Laboratory, 

 where the development of experimental methods has now reached such a point 

 that certain geological problems can be approached with some assurance of 

 solution. 



Presented in abstract extemporaneously. 



FUSION OF t<EDIMEXTARY NOCKS IX DRILL-HOLES 

 BY BAILEY WILLIS 



(Abstract) 

 The paper discusses the conditions under which the drilling took place. 



Eead by title. 



FUSIOX OF SEDIMEXrARY ROCKS IX DRILL-HOLES 

 BY X. L. BOWEX AXD M. AUROUSSEAU 



Presented in abstract extemporaneously. 



Brief remarks were made by Dr. Sidney Powers. 



XENOLITHS IX THE STOXY CREEK, COXXECTICUT, GRAXITE 

 BY JAMES F. KEMP 



Presented in abstract extemporaneously. 



Discussion 



Prof. A. C. Laxe : I would like to ask what causes the white halo around 

 the xenolith? 



Professor Kemp : One often sees pegmatite structure more marked. In order 

 to bring these out in contrast with stone, we have to sponge them with water. 

 This may have brought about the white halo. I have not seen any develop- 

 ment other than the coarser combinations of granite. 



