402 PROCEEDINGS OF WASHINGTON MEETING. 



lying Laurentian Fundamental gneiss was pointed out some years ago in a paper 

 by the author read before this Society. The subsequent investigations on these 

 rocks to the west and southwest showed that the conclusions then presented were 

 correct, but that as the work extended westward to the south side of the Ottawa 

 the character of the various groups of rocks gradually changed. The areas of lime- 

 stone became much more extensive, and there was a large development of horn- 

 blende and other dark colored rocks rarely seen to the north of the Ottawa. The 

 limestones, also, were very often highly dolomitic, and in certain areas were blue 

 and slat}', with but little of the aspect of the Grenville limestones, except where 

 they were in close contact with masses of intrusive granite or diorite. There is 

 also in the rocks of this group to the south of the Ottawa, where they have been 

 styled the Hastings series from the fact that they were first studied in the county 

 of Hastings, a very considerable proportion of schists — micaceous, chloritic, and 

 hornblendic — with certain regularly slaty beds and others of true conglomerate 

 containing quartz pebbles. In certain portions the lithological resemblances be- 

 tween the Grenville and Hastings rocks are very close, and they may for all prac- 

 tical purposes be regarded as one and the same series. From a number of sections 

 made in the counties of Renfrew on the south of the Ottawa and in Pontiac to the 

 north of that river, it would appear that the original Grenville limestones and asso- 

 ciated gray and rusty gneisses form the lower part of the series, since it is only on 

 the development eastward toward the typical Hastings locality that the character- 

 istic Hastings schists and associated strata are met with. 



The paper was discussed by B. K. Emerson, J. P. Iddings, Charles H. 

 Smyth, Jr., J. E. Wolff, and H. W. Turner. It is published in full in 

 the American Journal of Science, volume in, March, 1897, pages 173- 

 180. 



The second paper was the following : 



WEATHERING OF MICACEOUS GNEISS IN ALBEMARLE COUNTY, VIRGINIA 



BY GEORGE P. MERRILL 



The paper was discussed by A. C. Lane, Louis V. Pirsson, J. F. Kemp, 

 and the author. It is printed as pages 157-168 of this volume. 



The paper next read was entitled — 



THE CRYSTALLINE AND METAMORPHIC ROCKS OF NORTHWEST GEORGIA 

 BY C. WILLARD HAYES AND ALFRED H. BROOKS 



The paper was discussed by A. C. Lane, Arthur Keith, and A. H. 

 Brooks. A brief abstract is published in Science, volume 5, January 15, 

 1897, page 97. 



