DEPAKTMENT OF THE INTEEIOE BULLETIN OP THE UNITED STATES GEOLOGICAL SURVEY . iso WASHINGTON GOVERNMENT PRINTING OFFICE 1896 UNITED STATES GEOLOGICAL SURVEY CHAKLES D. WALCOTT, DIliECTOR BIBLIOGRAPHY AND INDEX NOETI AMEEICAN GEOLOGY, PALEONTOLOGY, PETROLOGY, AND MINERALOGY FOR 1892 AND 1893 BT V FEED BOUGHTON WEEKS WASHINGTON GOVERNMENT PRINTING OFFICE 1896 CONTENTS. Letter of transmittai..___._.___._-__.---._.._-'___.....__.___...____..__..__ 7 Introduction. --...-._...............--.....-.---.-..--..-..-.....-...--.... 9 List of publications examined._._-_.------_-----.--....................... 11 Classified key to the index..........--...-..--..-.---...-.-....-..-----... 15 Bibliography.-.....-.........---.-.--------.-----.----...--..-.--...--... 21 Index --.__..._..___.....:..__..---.-----.-----.----------------------.--- 155 LETTER OF TRANSMITTAL DEPARTMENT OF THE INTERIOR, UNITED STATES GEOLOGICAL SURVEY, DIVISION OF GEOLOGY, Washington, D. (7., April 30,1895. SIR: I have the honor to transmit herewith the manuscript of a Bibliography and Index of Forth American Geology, Paleontology, Petrology, and Mineralogy for the years 1892 and 1893, by Mr. F. B. Weeks, with the recommendation that it be published by the Survey. I believe that the work has been well done, and that the publication will be a useful one. Yery respectfully, S. F. EMMONS, Geologist. Hon. CHARLES D. WALCOTT, Director United States Geological Survey. BIBLIOGRAPHY AND INDEX OF NORTH AMERICAN GEOLOGY, PALEONTOLOGY, PETROLOGY, AND MIN ERALOGY FOR 1892 AND 1893. BY FRED BOUGHTON WEEKS. INTRODUCTION. This Bibliography and Index is a continuation of the Eecord of North American.Geology by N. H. Darton,1 though the scope of the work and its arrangement have been materially changed. The last Eecord, Bulletin No. 99, embraced publications on geology for 1891. The present work covers the years 1892 and 1893 and consists of a rec ord of the papers on North American geology, paleontology, petrology, and mineralogy contained in the List of Publications following. Bibliography. The Bibliography consists of full titles of separate papers, classified by authors, an abbreviated reference to the publica tion in which the paper is printed, and a brief summary of the con tents, each paper being numbered for index reference. The extent of papers less than a single page in length is indicated, as £ p., 5 1. (lines). Index. The subject headings, their subdivisions and arrangement, are shown in the Classified Key to the Index. They comprise geo graphic, geologic, mineralogic, paleontologic, and petrologic subdivi sions. Under Economic Geology is given a list of useful minerals and ores described in publications examined; under Mineralogy, a list of minerals described in such publications; under Paleontology, a list of genera and species of fossils therein described; and under Petrology, a list of rocks described; reference*being made in each case, by author's name and number of article in the Bibliography, to the paper in which the fossil, mineral, or rock is described. The author is under many obligations to different members of the Survey for suggestions as to the general character and arrangement of the material comprised in this volume. 1 Bibliography of North American Geology for 1886, by Nelson H. Darton; Bull. TJ. S. Geol. Survey No. 44, 35 pp., 8°, 1887. Kecord of North American Geology for 1887 to 1889, inclusive, by Nelson Horatio Darton; Bull. 17. S. Geol. Survey No. 75,173 pp., 8°, 1891. Eecord of North American Geology for 1890, by Nelson Horatio Darton; Bull. TJ. S. Geol. Survey No. 91,88 pp., 8°, 1891. Eecord of North. American Geology for 1891, by Nelson Horatio Darton; Bull. CT. S. Geo). Survey No. 99,73 pp., 8°, 1892. 9