WHITE : PETROGRAPHY OF THE BOSTON BASIN. 149 
Slide. 
Granite, with porphyritic inclusions, same locality ... 72 
Finer granite, side of Rattlesnake Hill. 73 
7. Hornblende granitite. 
East Braintree. E 3 
West Bank, Weymouth Fore River, PL 1, Fig. 3 C 2 
Burying Island. 40 
8. Porphyritic aporhyolite. 
Blue Hills Reservation . . 108 
Green Street, Canton .• . C11 
South of Glover’s Hill; Blue Hills Reservation ... C 9 
Wampatuck Hill. 76 
“ “. 85 
“ “ (Microperthitic ground-mass) .... 83 
Near Wampatuck Hill, PI. 1, Fig. 4. CIO 
“ “ “. 81 
Rattlesnake Hill. C13 
Pine Hill. (Contains inclusions). 66 
Broken Hills, 2-foot green “ash bed”. 87 
“ “ with inclusions. 89 
“ “ “ “ . 89a 
9. Fluidal aporhyolite. 
Rattlesnake Hill. 200 
Beyond top of Pine Hill. 27 
Summit of Wampatuck Hill. Plate 2 , Fig. 6 ... . 78 
Between Wampatuck and Rattlesnake Hills . . . . C12 
10. Hikes in the slate. 
Diabase, cutting Cambrian, Hayward Creek quarry . . 13 
Diabase, 15 ft. wide, side of Eldridge Hill .... 17 
Diabase, 2£ feet wide, Mill Cove ... ... 50 
Decomposed diabase, Mill Cove dam 51 
Diabase, 300 ft. wide, opposite brick store, Quincy Ave., 
Weymouth. 37 
“Primary dike.” Gabbroitic diabase. South of Pine Tree 
Brook. 218 
11. Hikes older than the granite. 
Coarse diabase, near target of shooting range, Blue Hills 
Reservation. 214 
Diabase, east of Pine Tree Brook, near Walnut Ave . . 215 
12. Hikes newer than the granite. 
Diabase with pink augite. Mt. Pleasant. . . . . 217 
Augite porphyrite, 35 feet wide ; Pine Hill. Plate 2 , Fig. 8 . 203 
Diabase, 5£ feet wide; Broad and Vine Streets, Weymouth . 71 
Gabbro; west side of North Common Street .... 213 
Diabase; Quincy Ave., opposite brick store, bears N. W., branch¬ 
ing into the granite 4 feet wide. 39 
Diabase ; cutting the melaphyr flow, Hough’s Neck . . 205 
