XTbe journal of ($eoloG£ 



Published on or about the following dates: February i, March 15, May 1, June 15, 

 August 1, September 15, November 1, December 15. 



Vol. XIX CONTENTS FOR SEPTEMBER-OCTOBER, \9U 



No. 6 



PRELIMINARY STATEMENT CONCERNING A NEW SYSTEM OF QUATERNARY LAKES IN THE 



MISSISSIPPI BASIN - - Eugene Wesley Shaw 481 



GRAVEL AS A RESISTANT ROCK ----- - John Lyon Rich 492 



THE CRETACEOUS AND TERTIARY FORMATIONS OF WESTERN NORTH DAKOTA AND EASTERN 



MONTANA ----------------- a. G. Leonard 307 



ON THE GENUS SYRINGOPLEURA SCHUCHERT - - - ' - - - - - George H. Girty 548 



PRELIMINARY NOTES ON SOME IGNEOUS ROCKS OF JAPAN. I - - - - - - - S. Kozu 555 



PRELIMINARY NOTES ON SOME IGNEOUS ROCKS OF JAPAN. II ------ S. Kozu 561 



PRELIMINARY NOTES ON SOME IGNEOUS ROCKS OF JAPAN. Ill ------ S. Kozu 566 



REVIEWS ----------------- 57 6 



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