CONTENTS TO VOLUME XXI 
NEW SPECIES FROM THE SANTA Lucta MOUNTAINS, CALIFORNIA, WITH 
A DISCUSSION OF THE JURASSIC AGE OF THE SLATES AT SLATE’S 
SPRINGS. Charles H. Davis 
GLaciAL Pot-HoLes aT Crown Point, NEw York. E. Eugene 
Barker 
REVIEWS 
RECENT PUBLICATIONS 
NUMBER VI 
THE GENERAL PRINCIPLES UNDERLYING METAMORPHIC PROCESSES. 
I. John Johnston and Paul Niggli 
DIASTROPHISM AND THE FORMATIVE PROCESSES. I. INTRODUCTION. 
T. C. Chamberlin 
DIASTROPHISM AND THE FORMATIVE Processes. II. SHELF-SEAS AND 
CERTAIN LIMITATIONS OF DIASTROPHISM. T. C. Chamberlin 
OVERTHRUST FAULT IN NEARLY FLAT Strata. G. Sherburne Rogers 
CONTRAPOSED SHORELINES. Charles H. Clapp 
THE BEARING OF PROGRESSIVE INCREASE OF VISCOSITY DURING IN- 
TRUSION ON THE Form oF Laccotitus. Sidney Paige 
Cross-BEDDING IN THE WHITE RIVER FORMATION OF NORTHWESTERN 
SoutH Daxota. Dean E. Winchester 
BURIED VALLEY OF SUSQUEHANNA RIVER IN LUZERNE COUNTY, PENN- 
SYLVANIA. N. H. Darton 
THE EFFECT OF LEACHING ON DRIFT PEBBLES. J. A. Udden 
REVIEWS 
RECENT PUBLICATIONS 
NUMBER VII 
DIASTROPHISM AND THE FORMATIVE Processes. II]. THE LATERAL 
STRESSES WITHIN THE CONTINENTAL PROTUBERANCES AND THEIR 
RELATIONS TO CONTINENTAL CREEP AND SEA-TRANSGRESSION. 
T. C. Chamberlin 
THE GENERAL PRINCIPLES UNDERLYING METAMORPHIC PROCESSES. 
II. John Johnston and Paul Niggh 
THE PRIMITIVE STRUCTURE OF THE MANDIBLE IN AMPHIBIANS AND 
Reptites. S. W. Williston . 
FossIL FEATHERS AND SOME HERETOFORE UNDESCRIBED FOSSIL BIRDS. 
R. W. Shufeldt 
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534 
537 
541 
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564 
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574 
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