322 GEOLOGY OF THE NAEEAGANSETT BASIN". 



lite, slate, and shale fire clay in the original record have been grouped 

 together as a single bed under the name argillite: 



Record of boring in Portsmouth, Rhode Island. 



Feet. Inches. 



1. Below casing', fire clay 13 1 



2. Argillite, dark colored, growing lighter and becoming friable downward . 9 4 



3. Argillite, in upper part slaty, banded and light gray, crossed by seams 



of epidote and magnetite 8 7 



4. Gray sandstone 8 



5. Drab slate 1 



6. Gray sandstone, containing calcite 3 11 



7. Brecciated slate - . 1 



8. Carbonaceous argillite 2 1 



9. Coal, with quartz impurities, brecciated 3 



10. Carbonaceous argillite 2 6 



11. Coal, some quartz in uppermost part 3 9 



12. Slate 6 



13. Coal, considered good up to 49 feet 10 inches 2 9 



14. Quartz and slate breccia 2 



15. Coal, filled with fine particles of calcite 3 



16. Argillite 8 1 



17. Argillaceous slate 2 4 



18. Brecciated carbonaceous matter, containing quartz and some magnetite . 4 



19. Argillaceous shale . 2 2 



20. Coal, with quartz and iron pyrite 3 



21. Argillaceous shale 4 7 



22. Highly carbonaceous shale 6 2 



23. Quartz, with fire clay 5 8 



24. Fire clay, like top of hole 1 3 



25. Argillaceous shale 2 8 



26. Fine sandstone 4 



27. Quartz; probably chlorite gives the green color to a part of the quartz. 3 



28. Argillite, dip 24° 5 



29. Sandstoue, showing feldspar and chloritic development 6 



30. Coal, containing magnetite 1 



31. Quartz, containing chlorite and pyrite 1 



32. Sandstone 9 3 



33. Argillite, brecciated 3 6 



34. Sandstoue 13 7 



35. Quartz vein , 1 



36. Sandstone, discolored by iron oxide, with quartz veins, feldspar, and 



chlorite 16 5 



37. Carbonaceous shale 4 1 



38. Slate, drab iu color, with iron pyrite 4 6 



39. Carbonaceous shale, with quartz veins 2 



40. Black shale, with small quartz veins and iron pyrite ' 4 7 



