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



General features 7 



Stratigraphical and or<:igenic relations 10 



Kesults of the action of orogenic forces 20 



Overthrust phenomena , 25 



Dike rocks of the basin , , .., 27 



Chapter II.— Physical history of the basm - 30 



Relation to marine and atmospheric erosion and deposition 30 



Age of the 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 



Boils -.- 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 



