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CONTENTS. 



Page. 



Letter of transmittal , xv 



Preface xvii 



Part I. — General geology of the Narragansett Basin, by N. S. Shaler. 



Chapter I. — Position and surface relations of the Narragansett Basin, and the rocks it contains. 7 



General features 7 



Stratigraphical and orogenic relations 10 



Results of the action of orogenic forces 20 



Overthrust phenomena 25 



Dike rocks of the "basin 27 



Chapter II. — Physical history of the basin 30 



Relation to marine and atmospheric erosion and deposition 30 



Age of Carboniferous rocks of the basin 36 



Original relation of the Narragansett Basin to the sea 37 



Original distribution of the east Appalachian coal field 38 



Ancient margin of the basin 40 



Relative erosion of east and west Appalachians 40 



Recent changes of level 46 



General statement concerning base-leveling 47 



Cycles of deposition .. 49 



Arkose deposits of the basin 50 



Relation of arkoses to erosion 55 



Record value of conglomerates 59 



Red color of the Cambrian and the Carboniferous 62 



Chapter III. — Glacial history of the Narragansett Basin 64 



Carboniferous conglomerates 64 



Last Glacial period 67 



Amount of erosion 71 



Chapter IV. — Economic resources of the basin 77 



Soils 77 



Coals 79 



Condition of the beds 80 



Characteristics of the coals 82 



Conditions of future economic work - 85 



Iron ores: Iron Hill deposit 88 



Part II. — Geology of the northern and eastern portions of the Narragansett Basin, 

 by J. B. Woodworth. 



Chapter i. — The problem of stratigraphic succession 99 



Repetition of litbological characters 100 



Transition of litbological characters 100 



Effects of igneous intrusions 101 



Metamorphism ' 101 



Folding and faulting 101 



Denudation 101 



