XIV 



BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



PUBLICATIONS OF THE GEOLOGICAL SOCIETY OF AMERICA 



Regular Publications 



The Society issues annually, in four quarterly parts, a single serial octavo 

 publication entitled Bulletin of the Geological Society of America, the edi- 

 tion being 700 copies. A small supply of authors' separates of the longer arti- 

 cles is kept for sale by the Secretary at the prices quoted in each volume. 



The Bulletin is sold at the uniform price of ten dollars ($10.00) per vol- 

 ume, with a discount of twenty-five (25) per cent to Fellows of the Society, 

 persons residing elsewhere than in North America, and public and institu- 

 tional libraries; carriage extra. Subscriptions are payable in advance. Reg- 

 ular subscribers within the United States of America and its possessions re- 

 ceive their parts, postage paid, as issued. Forty (40) cents per volume must 

 be added to the subscription price to cover postage to other countries in the 

 Postal Union. 



The price of the index to volumes 1-10 is $2.25 and of the index to volumes 

 11-20 is $3.50 ; carriage extra. No reduction is made to dealers. Orders should 

 be addressed to the Secretary, whose address is care of the American Museum 

 of Natural History, New York, N. Y., and drafts and money orders should be 

 made payable to The Geological Society of America. 



Description of the Published Volumes 



Volumes. Pages. 



Vol. 1, 1889 593 + xii 



Vol. 2, 1890 622 4- xiv 



Vol. 3, 1891 541 4- xi 



Vol. 4, 1892 458 + xi 



Vol. 5, 1893 655 4- xii 



Vol. 6, 1894 528 4- x 



Vol. 7, 1895 558 + x 



Vol. 8, 1896 446 + x 



Vol. 9, 1897 460 + x 



Vol. 10, 1898 534 + xii 



Index to volumes 1-10 209 



Vol. 11, 1899 651 4- xii 



Vol. 12, 1900 538 + xii 



Vol. 13, 1901 583 4- xii 



Vol. 14, 1902 609 + xii 



Vol. 15, 1903 636 + x 



Vol. 16, 1904 636 4- xii 



Vol. 17, 1905 7S5 + xiv 



Vol. 18, 1906 717 4- xii 



Vol. 19, 1907 617 + x 



Vol. 20, 1908 749 + xiv 



Index to volumes 11-20 422 



Vol. 21, 1909 S23 4- xvi 



Vol. 22, 1910 747 + xii 



Vol. 23, 1911 75S + xvi 



Vol. 24, 1912 737 + xviii 



Vol. 25, 1913 802 + xviii 



Vol. 26, 1914 504 + xxi 



Vol. 27, 1915 739 + xviii 



LATES. 



Figures, 



13 



51 



23 



63 



17 



72 



10 



55 



21 



43 



27 



40 



24 



61 



51 



29 



29 



49 



54 



83 



58 



37 



45 



28 



58 



47 



65 



43 



59 



16 



94 



74 



84 



96 



74 



59 



41 



31 



111 



35 



54 



109 



31 



66 



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44 



36 



60 



28 



47 



27 



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30 



55 



