BIBLIOGRAPHY AND INDEX OF NORTH AMERICAN 
GEOLOGY, PALEONTOLOGY, PETROLOGY, AND MIN- 
ERALOGY FOR THE YEAR 1894. 
By Fred Botjghton Weeks. 
INTRODUCTION. 
This work is a continuation of the Bibliography and Index for 1892 
and 1893 (Bulletin No. 130), and records the papers on North American 
geology, paleontology, petrology, and mineralogy published in the year 
1894, almost all of which appeared in the serials composing the List 
of Publications Examined, immediately 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. 
