Magnetism in the United States, 9 



TABLE L 



Locality^ Geology^ and remarks. 



1. Near the geodetic station on the Dixmont hills, Penobscot county, Maine, Talcose 

 •Ute of a gray color, running E.N.E. and W.S.W^^ith a dip to the N.KW. from 



80^ to 90°. 



2. Waldo couoty. Maine. Gneiss, impregnated with oxyd of iron, Near the geo- 

 detic station on the summit. 



8. On Penobscot bay, Waldo county, Maine. Gneisa, On ground of Mr. Hugier. 



4. At the foot of Mount Sebattis, toAvn of Wales, Maine, in the meadow of Mr. H. 

 Marr. On the top of the hill the declination was found to vary from 9° to 14° in 

 a space of 50 yards. The hill is composed of granite, with quartz veins and de- 

 tached masses of mica, 



6. Town of Denmark, Maine. Granite. 



6. Town of Phippsburg, Maine, on the property of M. R. Morrison, fifty yards south 

 of geodetic station. 



Y. Town of Falmouth, Maine, in afield of Mr. Jos. Hobbes, close to the old road. 



Drift, clay, and gravel 



8. At the flag-staff on Camp ground, city of Burlington, Vermont. Drift, clay, and 

 sand, 60 or 80 feet deep, overlying limestone and sandstone. 



9. In the grounds of J. B. Brown, city of Portland. Drift, sand, and gravel. 



10. In a field near the dweHing-house of Dr. Cumminga. Talcose and mica slate, 

 intersected by a large trap dyke. 



11. Mouth of Saco river, extremity of south point. Metamorphic slates. 



12. 150 yards N.N.W. of Kennebunk Port Observatory. Granite, 



IS. On the summit of Mount Agamenticus, town of York, Maine. Sienite. 



14. Town of York, Me., in the field of J. Wyer, on the north side of Cape Neddick 

 river, to the south of and near the road leading to the seashore. Granite under- 

 lying the soil. 



15. On the summit of the hill, in the town of North Dcerfield, N, H. Mica slate, 



16. In an enclosure to the east of R. F. GerrisKs cottages. Argillaceous slate. 



17. The highest and most easterly summit of that name in Goffstown, 10 miles west 

 of Manchester. Mica slate. 



18. On the south side of the harbor of Hog Islanvl, 100 yards from the water. Tlie 

 Isles of Shoals are composed of mica slate and gneis?, with beds of granite ore, 

 and some of them are traversed by dykes of trap. 



19. Near Thompson's hotels on Plum Island, near Newburyport, Massachusetts. 

 Drift covered with sea sand* 



20. Sienite. The sienite of the coast of Massachusetts is frequently traversed by 

 dykes of trap, porphyritic trap, ttc. 



21. On the eastern point of Gloucester, Massachusetts. Sienite. 



22. 100 yards from the light, in the direction of Halfway Rock. Sienite. 



23. Salem, Massachusetts, Sienite. 



" Centre of old fort. Granite, partly covered by clay and sand. 



24. Marblehead, Massachusetts. Sieuite, 



25. On the hill Sienite. 



26. On South Boston Heights, between reservoir and Asylum for the Blind. Drift 

 at least 90 feet deep. Clay and sand, mixed with pebbles. 



2Y. Drift and alluvium, resting on argillaceous slate, 



28. Dedham, Massachusetts. Sienite. 



29. Ifear Cumberland Hill village, Rhode Island. Granite. Iron ore occurs near by. 



30. JTear Plymouth, Massachusetts. Drift. 



31. In the town of Fall River, Mass, Granite. Iron ore occurs in the neighborhood- 

 82. Near East Greenwich, Rhode Island. Metamorphic slate of carboniferous age. 



S3. Near Barnstable, Massachusetts. Drift. 



34, Oa a hill near Hyannis Point, about 60 feet high. Drift. 



85. Opposite New Bedford, Massachusetts, 22 yards east of fort Gneias. 



36. Nashua, Massachusetts, N.E. of the light, near S. shore of the cove. Drift, 



St. Martha'3 Vineyard. Tertiary strata, 



SECOND SERIES, VOL. XXIV, NO. 70. JULY, 1857, 



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