CONTENTS 



Pags. 



Chapter I. — The problem of stratigraphic succession 99 



Repetition of lithological characters 100 



Transition of lithologioal characters 100 



Effects of igneous intrusions 101 



Metaraorphism 101 



Folding and faulting 101 



Denudation 101 



Glaciation 102 



Submergence 103 



Absence of artificial excavations 103 



Chapter II. — The pre-Carboniferous rocks 104 



Algonkian period 104 



Blackstone series 104 



Cumberland quartzites 106 



Ashton schists 107 



Smithfield limestones 107 



Cambrian Period 109 



Lower Cambrian 109 



Middle Cambrian (unrepresented) 109 



Upper Cambrian 109 



Silurian Period (unrepresented) 113 



Chert pebbles 113 



Chapter III. — The igneous rocks of the border of the basin 114 



Granitic rocks 114 



Plympton felsites 116 



Granite-porphyry 117 



Other rocks 117 



Gabbro hills of Sharon 118 



Chapter IV. — The Carboniferous basin 119 



General structure of the basin 121 



Maps of the boundary of the basin 124 



Boundary of the basin on the north and east 125 



From Cranston to the Blackstone River 125 



From Blackstone River to Sheldonville 127 



Connection between the Narragansett and Norfolk County basins 127 



Sheldonville cross fault 127 



From Sheldonville to Foolish Hill 127 



Foolish Hill fault 128 



From Foolish Hill to Brockton 128 



From Brockton to the North River 129 



Shumatuscacant fault 129 



From North River to Lakeville 129 



From Lakeville to Steep Brook 130 



Inliers 130 



North Attleboro inlier 131 



Nemasket granitite area 131 



Summary 131 



93 



