Preface. 
The report upon the fossils of the Paleozoic formations of New 
Jersey forms Volume III. of the Paleontology Reports of the 
State Geological Survey. The previous reports of this series— 
Volume I., The Brachiopoda and Lamellibranchiata of the Raritan 
Clays and Greensand Marls, by R. P. Whitfield; and Volume IL, 
The Gasteropoda and Cephalopoda of the Raritan Clays and Green- 
sand Marls, by the same author—were prepared and published 
in co-operation with the United States Geological Survey. They 
appear, also, as United States Geological Survey Monographs [X. 
and XVIII., respectively. Although this report—Volume III.— 
was written and published under the direction of the present State 
Geologist, it is proper to state that the field work was commenced 
and carried on in 1899 and 1900, while Professor John C. Smock 
was State Geologist. 
The Paleontology Reports are distributed to libraries, geologists 
and other surveys. Volume III. will be sent upon request, also, 
to those especially interested in this subject. A few copies of 
Volumes I. and Il. of this series are still undistributed, and 
libraries are urged to notify the State Geologist of gaps im their 
sets of survey reports. The reports are distributed without cost, 
except that transportation charges are paid by the recipient. 
The subject matter of the Paleontology Reports is of a more 
specialized nature than of some of the volumes of the Final Re- 
port series—z. ec., the Report on the Physical Geography of the 
State, Volume IV.; and on Glacial Geology, Volume V.; nor is 
it of such direct economic value as the Report on Water-supply, 
Volume III.; and the Report on the Clay Industry, now in prepa- 
ration. Nevertheless, a knowledge of the fossils contained in the 
rocks of the State is of no little importance. The age of the for- 
mations, their correct stratigraphical position, and the conditions 
under which they originated, are, in part, to be determined by 
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