94 BULLETIN: MUSEUM OF COMPARATIVE ZOÖLOGY. 
PAGE. 
Form of the Basin y 220 Local Character 
The Northern Boundary . 220 The Problem ; 
The Sedimentary Series 222 Geographical Conditions . 
General Structure 223 Restoration of Strata . i 
Thickness ; i 226 Question of Original Basins i 
The Southern Boundary i 227 Significance of Arkose 
Relations to Igneous Rocks 227 Significance of Color 
Metamorphism 228 Precarboniferous Climate 
Summary : 228 Summary of Geographical 
The Narragansett Basil 229 Conditions : 
Literature =... 229 Hypotheses of Origin . 
Shape and Size of ls Barik 229 General Statement . 
Boundaries 231 Marine 
Sedimentary Be i 231 Lacustrine 
General Structure and Thick- Estuarine 
ness “ . 232 Fluviatile 
Relations to Igneous Rock . 233 Crush 
Metamorphism 233 Glacial i 
Summary ; 234 General Discussion 
The Harvard Conglomerate’. 235 General Statement 
General Description 235 Marine 
Structure . 235 Lacustrine 
Thickness 235 Estuarine . 
Metamorphism 236 Fluviatile 
Summary i 236 Crush 
General Summary 236 Glacial 
Structure . 236 Conclusions as to Origin. 
Thickness 237 The Harvard Conglomerate 
Relations to Igieous Rocks 238 Conditions of Deposition 
Metamorphism 238 General Summary 
Harvard Conglomerate 238 
ACKNOWLEDGMENTS 
HYPOTHESES OF ORIGIN. 
Statement of Problem 238 BIBLIOGRAPHY 
Thickness and Bulk of dedi. 
ments 238 EXPLANATION OF PLATES 
INTRODUCTION. 
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Derinitrion.—The term Roxbury Conglomerate is applied to a 
series of ancient sediments which occupy a large part of the so-called 
Boston Basin. 
glomerates, interbedded with sandstones and shales or slates. 
The series consists of arkoses and coarse and fine con- 
One 
of the conglomeratic members is well developed and exposed in Rox- 
