CONTENTS TO VOLUME XX 
ROCK-CUT SURFACES IN THE DESERT RANGES. Sidney Paige . 
SPECULATIONS REGARDING THE GENESIS OF THE DIAMOND. II. 
Orville A. Derby 
THE ORDER OF CRYSTALLIZATION IN IGNEOUS Rocks. N. L. Bowen 
PETROLOGICAL ABSTRACTS AND REVIEWS . 
NUMBER VI 
MICROSCOPICAL PETROGRAPHY FROM THE QUANTITATIVE VIEWPOINT 
Fred. Eugene Wright. 
GLACIATION IN THE TELLURIDE QUADRANGLE, CoLorapo. Allen 
David Hole 
ON THE STRATIGRAPHIC POSITION AND AGE OF THE JUDITH RIVER 
Formation. I. A. C. Peale 
MODIFICATIONS OF THE QUANTITATIVE SYSTEM OF CLASSIFICATION 
oF IcNEous Rocks. Whitman Cross, J. P. Iddings, L. V. Pirsson, 
H. S. Washington s 
Isostasy, A REJOINDER TO THE ARTICLE BY HARMON LEwis. John F. 
Hayford 
REVIEWS . as 
NUMBER VII 
THE DISCONFORMITY BETWEEN THE BEDFORD AND BEREA FORMATIONS 
IN CENTRAL Onto. Charles S. Prosser 
GLACIATION IN THE TELLURIDE QUADRANGLE, CoLorapo. II. Allen 
David Hole 
ON THE STRATIGRAPHIC POSITION AND AGE OF THE JUDITH RIVER 
HORMATION Nm eAceC@uskeales oh 9s. 0 fa) ao = 
SomME TRIASSIC FOSSILS FROM SOUTHEASTERN ALASKA. Wallace W. 
Atwood 
PRELIMINARY NOTES ON SOME IGNEOUS Rocks OF JAPAN. VI. S. 
Kozu . 
THE EFFect oF IGNEOUS INTRUSIONS ON THE ACCUMULATION OF OIL 
IN NORTHEASTERN Mexico. V. R. Garfias 
EDITORIAL 
REVIEWS 
A CORRECTION 
Vil 
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