XIV ILLUSTRATIONS. 



Page. 



Fig. 7. Map Bho wing general outline of the Narragansett Basin 121 



8. Section across eastern arm of the basin . . * 122 



9. Outline map and general cross section of the northern part of the basin 123 



10. Edward Hitchcock's cross section of the Carboniferous area 123 



11. Map showing distribution of red sediments 142 



12. Geological section northward from Robinson Hill 145 



13. Diagram showing disappearance of the Waiusutta group in the Coal Measures 148 



14. Section through felsite knob in Attleboro, Massachusetts 153 



15. Geological section in the Millers River region 156 



16. Geological section in the Arnolds Mills region 157 



17. Hypothetical geological section east and west through Providence, Rhode Island 160 



18. Folded and faulted Carboniferous shales at Pawtucket, Rhode Island 162 



19. Sketch of zone of excessively jointed sandstones, face of McCormick's quarry 166 



20. Geological section from Watchemocket Cove to Riverside, Rhode Island 166 



21. Geological section through rocky islets at Halsey Farm, Silver Spring, Rhode Island. . . 167 



22. Geological section of rocky headland near Silver Spring, Rhode Island 168 



23. Theoretical section of folded structure on western margin of the Narragansett Basin.. 169 



24. Contemporaneous erosion with unconformity in the Carboniferous at Attleboro, 



Massachusetts 176 



25. Diagram showing cross bedding 178 



26. Geological section of Plainville Valley and thrust plane 183 



27. Section of the Mansfield Coal Measures 190 



28. Geological section in Westville, Massachusetts 199 



29. Diagram illustrating the case where boring affords a satisfactory test for coal beds 208 



30. Diagram illustrating the case where trenching affords a satisfactory test for coal 208 



