PREFACE 
The investigations reported upon in this bulletin were begun prima- 
rily for the purpose of ascertaining the facts regarding the local 
modification of the Devonian and Silurian faunas in the eastern prov- 
ince of North America. They were authorized by the Director of the 
Survey in a letter dated June 16, 1897, in the words: ""Your special 
work will be the investigation of the Paleozoic rocks and fossils of 
eastern and northeastern Maine." 
The Canadian Survey had already reported upon the Anticosti and 
Gaspe scries, from the region beyond Maine to the east. In Nova 
Scotia the Arisaig and Nictaux series present another phase of the 
problem. Hitchcock, Shaler, and others, and, in Canada, Billings, 
Bailey, Mclnnes, Ells, and Ami, have gathered information here and 
there regarding the faunas occasionally met with in the region. It 
seemed greatly to be desired that careful collections should be made 
in the Maine territory, to serve as a basis for comparison between the 
t} 7 pical expression of the Paleozoic faunas in New York State and 
those described from the eastern provinces of Canada, and also as a means 
of comparing the American with the European phases of the Paleozoic. 
Ten years ago a beginning was made toward carrying out this plan, 
and collections were made in Somerset County (see fig. 1, p. 12). They 
alone did not throw much light upon the succession of Paleozoic faunas, 
and the work was resumed in 1897. 
The field work in Aroostook County (see fig. 1) was done in the sum- 
mer months of 1897 and 1898; in the former year by Dr. Herbert E. 
Gregory and myself and in the latter year by Dr. Gregoiy alone. In 
1897 the localities north of the Aroostook were examined by me, those 
south of the river partly by Dr. Gregory alone, and the more northern 
townships by both of us together. In 1898 Dr. Gregory reexamined 
the A^olcanic area, to gather special facts for his part of the report 
(Part II). The petrographic study of the materials gathered was made 
under the direction of Prof. L. V. Pirsson in the mineralogical labora- 
tory of Yale University. The results of his investigations were writ- 
ten by Dr. Gregory substantially in the form now appearing as Part 
II of this report, and were offered to and accepted by the faculty of 
the graduate department of Yale University for the degree of doctor 
of philosophy, given him in June, 1899. 
