ILLUSTRATIONS. 



Page. 



13. Metamorphic conglomerate allowing crushing 48 



11. Metamorphic conglomerate, showing shape of pebbles 49 



L5. Metamorphic conglomerate; flattened pebbles 50 



lti. Metamorphic conglomerate; round and flat pebbles 51 



17. Metamorphic conglomerate, banded variety 53 



18. Metamorphic conglomerate, typical 55 



19. Metamorphic conglomerate, showing large pebbles 57 



20. Conglomerate ; cliff - 58 



21. Albite-schist, Hoosac schist.. 59 



22. Albite-schist. Hoosac schist 61 



23. Albite-schist. Hoosac schist 62 



24. Mount Holly amphibolite 65 



25. Mount Holly amphibolite 66 



26. Mount Holly crumpled amphibolite 67 



27. Con t art of granitoid gneiss and metamorphic conglomerate 73 



28. Contact of granitoid gneiss and quart zite, Stamford dike, looking north 100 



29. Contact of granitoid gneiss and quart zite, Stamford dike, looking east 101 



30. Northwestern side, Mount Grey lock 136 



31. Albitic sericite-schist in contact with limestone 138 



32. Sericite schist with two foliations, in contact with limestone 139 



33. Sericite schist; specimen with two foliations 139 



34. Thin section illustrating origin of cleavage '. 140 



35. Sketch of ledge south of Sugarloaf, showing cleavage in both limestone and schist. . .. 140 



36. Limestone block with cleavage; Sugarloaf 141 



37. Limestone ledge with cleavage; east of Sugarloaf 141 



38. Weathered limestone from East mountain 142 



39. Polished surface of limestone shown in Fig. 38 112 



40. Weathered limestone with mica in cleavage planes 143 



41. Specimen of sericite-schist showing stratification and cleavage, Bald mountain 144 



1.', Spec n of Bericite-sohist showing only cleavage, Symonds peak 144 



43. Section of specimen shown in Fig. 42 145 



44. Section of specimen of sericite-schist, top of Mount Greylock 145 



45. Microscopic drawing of sericite-schist, top of East mountain 146 



46. Specimen of sericite-schist, one-fourth mile south of Mount Greylock 147 



47. Diagrams showing relation of quartz laminse to cleavage 148 



48. Ledge of sericite-schist, junction of Gulf and Ashford brooks ' MS 



49. Part of ledge shown in Fig. Is 149 



,"ii). Section of sericite-schist with quartz lamina?; fromGoodell hollow 150 



51. Ledge of mica-schisl in Readsboro, Vermont, with quartz in both foliations 151 



52. Sericite-schis! with two cleavages, Goodell hollow 152 



53. Section of sericite-. schist, one-fourth mile south of Greylock summit 153 



54. Sericite-schist, one-fourth mile southwest of Greylock summit 151 



55. Diagram showing fault between schisi and limestone 151 



56. Section of sericite-schist, Bald mountain spur 155 



57. Diagram showing relation of cleavage to stratification 156 



58. Diagram showing relation of cleavage to stratification 156 



59. Quartz laminse in schist, west side of Deer hill 157 



