BIBLIOGRAPHY AND INDEX OF NORTH AMERICAN 
GEOLOGY, PALEONTOLOGY, PETROLOGY, 
AND MINERALOGY FOR THE 
YEAR 1898. 
By Fred Boughton Weeks. 
INTRODUCTION. 
The method of preparing and arranging the material of the Bibli- 
ography and Index for 1898 is similar to that adopted for the previous 
publications on this subject (Bulletins Nos. 130, 135, 146, 149, and 156). 
Several papers that should have been entered in the previous bulletins 
are here recorded, and the date of publication is given with each entry. 
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 subdivision 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 the 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 Index has been added to by a list of chemical analyses of rocks 
and minerals and a list of names of geologic formations described in 
the publications examined. 
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