260 BULLETIN: MUSEUM OF COMPARATIVE ZOÖLOGY. 
southeast by more or less subdued mountains, or by a land area of 
sufficient height and extent to deprive passing winds of much of their 
moisture. 
(6) At the close of the sedimentation period, as registered in the 
Narragansett Basin, high grades and mountainous conditions prevailed 
in the regions surrounding the sites of the present basins. 
(7) Comparison of the characteristics of the Carboniferous series 
with the criteria previously obtained from other conglomerates show 
that several sets of processes combined to form the strata under dis- 
cussion. 
(8) The evidence, largely negative and unsatisfactory, favors non- 
marine origin. 
(9) Glaciers were not directly concerned with the deposition of 
the conglomerates, but they probably furnished material to torrents, 
by which it was deposited either upon the land or in lakes. 
(10) The conditions of deposition are uncertain but there is some 
evidence that sedimentation began during a broad differential uplift 
of the region and was later more or less localized in orogenic basins: 
developed by block faulting during deposition. The basins so formed 
always maintained outlets. 
(11) The extent of the postulated conditions is not certainly known 
but the evidence of the conglomerates at other localities goes to show 
that it greatly exceeded the present limits of the basins. 
ACKNOWLEDGMENTS. 
The work on this paper (a thesis presented to the Division of geol-- 
ogy at Harvard University May 1, 1906, for the degree of Doctor of 
Philosophy) has been conducted under the direction of Professor” 
Jaggar, but the writer is also indebted to Professors Woodworth and 
Davis for many helpful suggestions and much other assistance. Pro- 
fessor Emerson of Amherst has kindly permitted the use of maps, 
specimens, and slides of the Harvard and Worcester localities and has 
furnished other valuable information. Mr. J. H. Perry of Worcester 
has also provided maps and data with reference to outerops in that 
vicinity. Mr. J. W. Eggleston of Cambridge has permitted the use of 
unpublished manuscript with reference to the deformation of con- 
glomerates. The specimens, notes, and manuscript theses filed by 
many former students in the Laboratory of advanced geology at 
Harvard University have been extensively used in the collection of 
data, especially with regard to the location of outcrops. 
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