vill CONTENTS OF VOLUME XV 
NOTES ON THE GEOLOGICAL SECTION OF MICHIGAN. Part I. THE PRE- 
OrpoviciAN. A.C. Lane and A. E. Seaman . 
NOTES ON THE JAMAICA EARTHQUAKE. Myron L. Fuller 
GLACIAL EROSION IN LONGITUDINAL VALLEYS. Frank Carney 
REVIEWS . 
NUMBER VIII 
THE WITWATERSRAND GOLD REGION, TRANSVAAL, SOUTH AFRICA, AS 
SEEN IN RECENT Mininc DEVELOPMENTS. R. A. F. Penrose, Jr. 
METAMORPHISM BY COMBUSTION OF THE HYDROCARBONS IN THE OIL- 
BEARING SHALE OF CALIFORNIA. Ralph Arnold and Robert Ander- 
son 
THE SUDBURY LAccCOLITHIC SHEET. A. P. Coleman . 
THE COMPOSITION OF THE RED CLaAy. F. W. Clarke ; 
THE GLACIATION OF THE Urtnta Mountains. Wallace W. Atwood . 
NOTES ON THE PENNSYLVANIAN FORMATIONS IN THE R10 GRANDE VALLEY, 
New Mexico. C.H. Gordon . 
EDITORIALS 
REVIEWS . 
RECENT PUBLICATIONS 
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696 
722 
731 
735 
750 
759 
783 
79° 
805 
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