American Association Meeting. 255 
3. An Exhibition of the Rare Gems and Minerals of Mt. Mica. 
By Dr. A. C. Hamlin, Bangor, Maine. (Read by title.) 
4. The Hudson River Lobe of the Laurentide Ice-sheet. By Prof. 
C. H Hitchcock, Hanover, N. H. The drift and striae of Quebec, 
Nevif 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 mountains and 
to the southwest over the Adirondacks, but due south along the medial 
valley. Last October the author climbed Orford mountain, which 
rises northwest of lake Memphremagog to an altitude of about 5,000 
feet above the sea, and found it glaciated from bottom to top, wholly 
in a southeasterly course. All over the mountain were found boul- 
ders of Laurentian gneiss, which (according to their determination by 
Prof. Frank D. Adams of Montreal) must have come from the north 
side of the St. Lawrence river. It had before been shown that the 
highest mountains of New Hampshire and Vermont were glaciated 
from the northwest, but doubt had been lately expressed 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 indicated by itsFlcra. By 
Arthur Hollick, Columbia University, New York City. Inves- 
tigations in the paleobotany of the Amboy Clay series of New Jersey 
and the equivalents on Staten Island, Long Island, Block Island,* 
and }vlartha'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 Green- 
land, the Dakota group of the west, the Albirupean series of the 
south, and the Cenomanian of Europe, so that there was no hesita- 
tion in declaring them all to be Middle Cretaceous in age. This con- 
clusion seemed to be quite generally accepted, and was apparently 
not questioned until about two years ago, when an announcement 
was made, with some show of authority, that the series is probably 
Jurassic in age. In regard to the correlation of the several formations 
previously mentioned there can be no question. The large amount 
of paleobotanical material available for comparison has given oppor- 
tunity for the identification of so many species common to them all 
that this conclusion is not only justifiable but inevitable; and the only 
question is whether this correlation also demonstrates that the sev- 
eral formations are Middle Cretaceous in age. If any one of them 
is, then they all are; if any one is not, then the others are not. 
In paleobotany, as in paleozoology, the broad general facts are 
recognized that the biological sequence is coincident with the geolog- 
ical sequence, and that the further back in geologic time the simpler 
and lower in the scale of life were the organisms. Hence if we divide 
