344 ANNALS NEW YORK ACADEMY OF SCIENCES 



mainland of eastern New England have not been found, in spite of constant 

 search, e. g., the mica-gneisses and mica-pegmatites north of New Bedford, 

 the granite of Quincy, Mass., the Dorchester conglomerate, the pyroxenic 

 rocks and basic mica-diorites of Nahant, the porphyritic biotite granites 

 of the Maine coast, etc. The conclusion is that the pebbles at Harwich 

 have been transported from some other micaless region. 



Among the pebbles in ploughed fields many rude stone implements may 

 be found, such as tomahawks, scrapers, lance-heads, and particularly 

 arrowheads of the simplest form, probably left by Indians of the Massaquoit 

 tribe of whom several small kitchen-middens have been found in the neigh- 

 borhood. These tools have been made from the local materials above 

 described, chiefly from pebbles of the harder and finer schists, rhyolite, 

 quartz-porphyry and often granite. Their dull edges and rounded points 

 may imply that in many cases they have never been sharpened, but used for 

 stunning birds and small animals. Many show mere traces of human 

 workmanship, perhaps but one or two artificial faces, as if their owners had 

 been content to use the simplest flakes for arrow-points. 



Professor Grabau described field work carried on in company with 

 Professor Sherzer in southern Michigan for the state survey. The special 

 object of study was the Upper Monroe formation and the Sylvania sandstone. 

 The evidences of the eolian (anemoclastic) orighi of this rock were presented. 

 An interesting new famia of late Siluric age and with Devonic affinities was 

 found in the highest beds. Evidence of the disconformable relation of the 

 Monroe and the overlying Dundee (Onondaga) was obtained. 



After discussion of both papers by Professor Kemp, Dr. Hovey and 

 others, the members of the section contributed observations made during the 

 summer. Professor J. F. Kemp stated the general results of study of the 

 petrography of the Adirondack region, and Dr. E. O. Hovey gave an account 

 of excursions of Section E of the American Association for the Advancement 

 of Science in the vicinity of the Adirondacks. Professor C. P. Berkey 

 reviewed his recent investigations in the Highlands of New York and stated 

 the difficulty of correlation of the Manhattan schists on the south with the 

 Cambrian sedimentaries on the north, but reported the passage of the latter 

 into crystalline condition eastward toward the Connecticut line. 



The Section then adjourned. 



Alexis A. Julien, 



Secretary. 



