CONTENTS OF VOLUME XXVII vii 



NUMBER VII 



The Late Pleistocene Submergence in the Columbia Valley of 



Oregon and Washington. J Harlen Bretz 489 



A Laboratory ant) Field Study oe Cobble Abrasion. Chester K. 



Wentworth . . . 507 



Classification of Springs. Kirk Bryan 522 



Aequinoctia, an Old Paleozoic Continent. E. C. Abendanon . 562 



On Coarse Gabbroid Diabase in Westfield, Massachusetts. 



Earl V. Shannon 579 



Recent Publications 581 



NUMBER VIII 



The Rigidity of the Earth. A. A. Michelson and H. G. Gale . . 585 



A Peculiar Belt of Oblique Faulting. R. T. Chamberlin . . 602 



The Paleozoic Section of the Tomah and Sparta Quadrangles, 



Wisconsin. W. H. Twenhofel and F. T. Thwaites . . . 614 



The Horizon of the Marine Jurassic of Utah. C. L. Dake . . 634 



The West Point Salt Dome, Freestone County, Texas. E. 



DeGolyer 64;^ 



Editorial: Joseph Barrell and His Work. Bailey Willis . . 664 



Recent Publications 673 



Index to Volume XXVII 675 



