xxviii APPENDIX. 



- 8. Common argillaceous slate, with quartz veins, Guilford, Vermont. 



9. Common argillaceous slate, v/iih quartz veins, Guilford, Vermont. 



— 10. Common argillaceous slate, wavy surface, glen at Leyden. 



"~11. Common argillaceous slate, contorted, Guilford, Vermont, 



—12. Common argillaceous slate, contorted, Guilford, Vermont. 



-13. Micaceo-argillaceous slate, en echellon, glen at Leyden. 



— 14. Argillaceous slate, much bent, Guilford, Vermont. 



- -15. Argillaceous slate, much bent, Guilford, Vermont. 



~ 16. Argillaceous slate, exhibiting a double flexure, Guilford, Vermont. 



"^ 17. Argillaceous slate, red. Sand Lake, New York. 



— 18. Argillaceous slate, gray beneath limestone, Chatham, New York. 



— 19. Argillaceous slate, epidotic, Hancock. 

 —20. Chlorite slate, Guilford, Vermont. 



**21. Chlorite slate, passing into novaculite, Guilford, Vermont. 

 —22. Chlorite slate, passing into novaculite, Guilford, Vermont. 

 23. Chiastolite in argillaceous slate, Lancaster. 

 V 24. A card of macles, Lancaster. 

 25. Clay slate, quarry. Harvard. 

 ^i 26. Clay slate, jointed, Lancaster. 

 V 27. Clay slate, jointed, Lancaster. 

 V28. Clay slate, with a vein of granite, Harvard. 

 y 29. Clay slate, Groton. 

 30. Clay slate, Groton. 

 --' 31. Gray conglomerate, Natick. 



— 32. Conglomerate nodules, chiefly mica slate, Bradford. 



— 33. Conglomerate nodules, fine mica slate or quartz rock containing mag. 



oxide iron, Middletown, Rhode Island. 

 ■~ " 34. Breccia, fragments of slate reunited, Natick. 



— 35. Breccia, fragments of slate reunited, Randolph. 

 »~ 36. Breccia, fine, fragments of slate reunited, Natick. 



— 37. Breccia, somewhat rounded, slaty, Dorchester. 



— 38. Breccia, somewhat rounded, slaty. Canton. 



— 39. Gray grit, (boulder,) Hull. 

 -" 40. Gray grit, Newton. 



— '41. Gray grit, with veins of quartz, Pawtucket. 



—42. Gray grit, with veins of quartz, Stephentown, New York. 



— 43. Gray grit, with veins of quartz, Attleborough. 



— 44. Gray grit, Rehoboth. 

 ~ 45. Gray grit, Newton. 



— 46. Gray grit, Watertown. 

 *~47. Gray grit, Pawtucket. 



- -48. Gray grit, light, Newbury. 



—49. Gray grit, glazed, Newport, Rhode Island. 



— 50. Gray grit, glazed, Watertown. 

 --51. Gray grit, Natick. 



- 52. Gray grit, epidotic, Newton. 



— 53. Gray grit, Taunton. 



