ILLUSTRATIONS. 



Pi.. XII. Mount Greylock, eastern side 130 



XIII. Mount Greylock, western side 132 



XIV. Southern summit of Mount Greylock 134 



XV. Southern side of Mount Greylock 136 



XVI. Southern end of Ragged mountain 160 



XVII. The north-south part of Hopper 192 



XVIII. Greylock sections A, B, C, D 



XIX. Greylock sections E, F 



XX. Greylock sections G, H, I 



XXI. (i icy lock sections J, K, L, M 



XXII. Greylock sections N, O 



XXI II. Greylock longitudinal sections P, Q, R 



Fig. 30. Mount Greylock, north-northwestern side 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 11° 



35. Sketch of ledge south of Sugarloaf; cleavage in both limestone and schist 14(1 



30. Limestone block with cleavage, Sugarloaf 1 1 1 



37. Limestone ledge with cleavage, east of Sugarloaf 14 1 



38. Weathered limestone from East mountain 112 



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 



12. Specimen of sericite-schist showing only cleavage, Symonds peak 144 



43. Section of specimen shown in Fig. 42 115 



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



45. Microscope drawing of sericite schist, top of East mountain 146 



46. Specimen of sericite schist one-fourth mile south of Mount Greylock 117 



47. Diagrams showing relation of quartz lamin* to cleavage 118 



48. Lodge of sericite-schist, junction of Gulf and Ashford brooks 148 



49. Part of ledge shown in Fig. 48 149 



50. Section of sericite-schist with quartz lamina, from Bald mountain 150 



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



52. Sericite-schist with two cleavages, Goodell hollow 152 



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