Putnam.] 
216 
[May 18, 
Mr. Wadsworth shows that in the Somerville-Brighton region 
the “Traps” (whose direction he states at N. 40° E.) 1 cut or 
fault 2 the “ Greenstones ” (N. 60° W.). On the 4 North Shore 5 
also two intersecting series can be identified. 
On Marblehead Neck the granite is cut at Flying Point by two 
nearly parallel dikes forty feet apart ; one, two feet six inches 
thick, vertical with direction east, the other one foot three inches 
thick, high west dip, direction about E. 10° S. At the head of 
Lobster Cove in Manchester (a little south of the fine exposure of 
contact between granite and porphyritic ‘greenstone’ at the angle 
of the road) is a dike one foot wide, direction N. 82° W. West- 
ward on the hill are exposed two dikes ; one N. 60° W., the other 
a foot thick having a zigzag course about W. 10° S. Near the 
pier at Procter’s Point the granite is cut by a dike with direction 
N. 10° W. 
At Glass Head two parallel dikes through the granite, which is 
there coarsely crystalline, may be seen at a short distance apart, 
one three feet six inches thick, the other two feet eight inches, 
their common direction about N. 70° W. The larger of these is 
seen to be cut by a seven inch dike whose direction is N. 30° E. 
On Kettle Island, off Magnolia, a dike which bends from N. 30° 
W. to N. 40° W., is cut by another two feet and a half wide, 
running N. 20° E. The latter is of exceptional interest from the 
fact of its containing numerous rounded fragments of granite and 
diorite several inches in diameter, distributed along the middle of 
its exposed surface. 
The North Gooseberry dike appears to range itself with the sec- 
ond class. 
Mr. F. W. Putnam, Curator of the Peabody Museum, gave an 
account of his recent explorations in Ohio, of which the following 
is an abstract of the portion relating to the interesting discov- 
eries at Madisonville. A number of specimens of pottery, and 
of bone and stone implements, ornaments and other objects 
obtained from the ash-pits, were exhibited to the Society. 
1 Proceedings, Vol. xix, p. 226. 
2 lb. p. 224, no. 7 ; p. 225, no. 18. 
