322 GEOLOGY OF THE KARRAGANSBTT 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. ArgiUite, in upper part slaty, banded and liglit gray, crossed by seams 



of epidote and magnetite « 8 7 



4. Gray sandstone 8 



5. Brab slate 1 



6. Gray sandstone, containing calcite 3 11 



7. Brecciated slate 1 



8. Oarbonaceons argillite , - 2 1 



9. Goal, with quartz impurities, brecciated 3 



10. Carbonaceous argillite , 2 6 



11, Goal^ some quartz in uppermost part • 3 9 



la Slate 6 



13. Ooal^ considered good up to 49 feet 10 inches 2 9 



14. Quartz and slate breccia - — 2 



15. Coaly 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. Coaly 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. Sandstone, showing feldspar and chloritic development 6 



30. Goal, containing magnetite 1 



31. Quartz, containing chlorite and pyrite 1 



32. Sandstone 9 3 



33. Argillite, brecciated 3 6 



34. Sandstone 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 in 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 



