October 7, 1898.] 



SGIENGE. 



467 



7. The Five Civilized Tribes and the Topo- 

 graphic Survey of Indian Territory. By 

 Charles H. Fitch, Washington, D. C. 



8. Bitter Boot Forest Reserve. By Kich- 

 AED U. GooDE, Washington, D. C. 



The papers of Section E of the Associa- 

 tion were as follows : 



1. Outline Map of the Geology of Southern 

 New England. By Peofessoe B. K. Emee- 

 SON, Amherst, Mass. This paper, with 

 maps, gave a summary of the areal geology 

 of Massachusetts, Rhode Island, Connecti- 

 cut, and parts of New Hampshire, Vermont 

 and New York. 



2. Basin in Glacial Lake Deltas. By Peo- 

 fessok H. L. Faiechild, Rochester, N. Y. 

 During the glacial recession the impounded 

 high waters of the Canandaigua valley, in 

 central New York, at one time escaped 

 across the eastern border of the basin into 

 the Flint creek valley, which was also oc- 

 cupied by a glacial lake at a lower level. 

 The river thus formed cut a channel in drift 

 and rock, and deposited the debris, as a 

 delta, at its mouth in the lower lake. The 

 delta now forms a conspicuous plateau of 

 gravel 125 feet above the adjacent village of 

 Potter. In this plateau is an irregular de- 

 pression which reaches to the very base of 

 the delta deposit, and occupies, perhaps, a 

 fourth of the area of the plateau. The only 

 satisfactory explanation of its origin is that 

 an isolated block of ice was left there by 

 the receding ice-front, and that the delta 

 material was piled around it, the subsequent 

 meltingof the iceblock producingthe cavity. 

 Elsewhere shallow basins occurring in del- 

 tas are in many cases attributable to de- 

 ficient filling by capricious currents and 

 wave action ; but such bowls cannot be 

 confounded with the Potter kettle-hole, 

 which was illustrated by a map and photo- 

 graphs. 



3. An Exhibition of the Rare Gems and Min- 

 erals of Mt. Mica. By De. A. C. Hamlin, 

 of Bangor, Maine. (Eead by title.) 



4. The Hudson River Lobe of the Lauren- 

 tide Ice- sheet. By Peofessor C. H. Hitch- 

 cock, Hanover, N . H. The glacial drift and 

 striae of Quebec, New England and New 

 York prove the existence of a glacial lobe 

 following the Champlain-Hudson valley. 

 The movement was to the southeast over 

 the summits of the White and Green Moun- 

 tains and to the southwest over the Adiron- 

 dacks, but due south along the medial val- 

 ley. Last October the author climbed Or- 

 ford Mountain, which rises northwest of 

 Lake Memphremagog to an altitude of about 

 5,000 feet above the sea, and found it glaci- 

 ated from bottom to top, wholly in a south- 

 easterly course. All over the mountain 

 were found boulders of Laurentian gneiss, 

 which (according to their determination by 

 Professor Frank D. Adams, of Montreal) 

 must have come from the north side of the St. 

 Lawrence Eiver. It had before been shown 

 that the highest mountains of New Hamp- 

 shire and Vermont were glaciated from the 

 northwest, but doubt had been lately ex- 

 pressed about Or ford Mountain. These 

 observations prove that the Laurentide ice- 

 sheet overrode all these mountains, flowing 

 from the region north of Montreal and 

 Quebec southward and southeastward to 

 the sea border. 



5. The Age of the Amboy Clay Series as in- 

 dicated by its Flora. By Arthur Hollick, 

 Columbia University, New York City. In- 

 vestigations in the paleobotany of the Am- 

 boy Clay series and the equivalents on Sta- 

 ten Island, Long Island, Block Island and 

 Martha's Vineyard, conducted during the 

 past twenty years by the late Dr. J. S. 

 Newberry, Dr. Lester F. Ward, Mr. David 

 White, the writer and others, have shown 

 that the formation which includes them is 

 very closely related to the Atane and Patoot 

 beds of Greenland, the Dakota group of the 

 West, the Albirupean series of the South 

 and the Cenomanian of Europe, so that 

 there was no hesitation in declaring them 



