84 



STRATIGRAPHICAL GEOLOGY. 



HURONIAN GROUP. 



389, Drab sihceous schist. 



390, Siliceous schist. 



391, 392, Bluish-gray siliceous schist — No- 

 vaculite. 



393, Siliceous schist, with hornblende. 



394, Light drab siliceous schist. 



395, Siliceous schist — argillaceous. 



INTRUSIVE ROCKS. 



396, 397. 398, 399' 403, Sienite. 



400, Felsite — a veinstone. 



401, Breccia. 



402, Granite. 



404, "Trap." 



405, Diorite. 



407, 408, 409, Reddish granite. 

 416, Sienitic granite. 



HURONIAN GROUP. 



412, 413, 428, Dark gray quartz schist. 



414, Trap with epidote. 



415, Argillaceous sandstone. 

 427, Quartz. 



418, Feldspathic quartzite. 



419, 420, Siliceous limestone. 



421, Quartzite. 



422, 423, 433, 436, Siliceous schist — argil- 

 laceous. 



424, 426, Feldspathic quartz schist. 



425, Gray siliceous schist. 



429, 431, 448, 451, Quartz schist. 



430, Mica schist rich in quartz. 



434, Argillaceous mica schist, with stauro- 

 lite. 



435, Hornblende schist. 



437, 452, 453, Argillaceous mica schist. 



438, Ferruginous mica schist. 



449, Fine-grained dark mica schist. 



450, Fine-grained mica schist. 



454, Coarse granite. 



INTRUSIVE ROCKS. 



432, 445, 446, Sienite. 



439' 440, 441 > 442, 444' 447' Granite. 



443, Aplite. 



VERMONT. — HURONIAN GROUP. 



455, Granitic gneiss (M). 



456, Dark gray gneiss (M). 

 486, Sandstone — friable. 



490, Mica schist. 



491, Granitoid gneiss. 



COtiS GROUP. 



458, 468, 474, 479, Calciferous mica schist. 



459, Hornblende mica schist. 



460, 461, 466, Mica schist. 



462, Quartzite. 



463, Quartz — a veinstone. 



464, Granitic gneiss. 



467, Quartz with hornblende. 



469, 470, 475, Argillaceous mica schist. 



471, A veinstone with Vesuvianite. 



472, Vesuvianite. 



473, 476, Siliceous limestone. 



477. Quartz. 



478, Hornblende. 



INTRUSIVE ROCKS. 



465, 480, 483, 484, 485, 487, Granite. 



481, Reddish granite. 



482, "Trap." 

 488, 489, Sienite. 



ATLANTIC SERIES. 



Berlin. 



492, Gray micaceous gneiss. 



493, 510, 515, 516, 521, Hornblende schist. 



494, Siliceous sandstone. 



