IIO : The American Naturalist. [January, 
D. Honeyman.—Glacial Geology of Cape Breton.—zo min. 
E. O. Hovey.—Observations on some of the Trap Ridges of the 
East Haven Region, Conn. 
After a general description of the local geology, the author discusses 
the contact phenomena between the trap and the sandstone ; the 
theories as to the age of the dikes; concludes that several of the ridges 
- are intrusions, not extrusions. —3o0 min. 
J. F. Kemp.—Trap Dikes near Kennebunkport, Me. 
In this paper the local geology is described, the relations between 
the dikes and adjacent rocks are given, and the author discusses the 
microscopic structure and chemical composition of the rocks.—zo min. 
Neff.—The Sylvania Sand in Cuyahoga Co., Ohio. 
The writer discusses the value of this sandstone as a producer of oil 
and gas; from its distribution, and that of the Borea Grit, he con- 
cludes that an anticlinal reaching above water-line existed in Cuyahoga 
County prior to the Lower Carboniferous.—11 min. 
. W. Spencer.—\. Characteristics of Ancient Shores in the Region 
of the Great Lakes. —33 min 
II. High Continental Elevation Preceding the Pleistocene Period. 
III. Origin of Boulder Pavements and Fringes.—12 min. 
C. D. Walcott,—Study of a Line of Displacement in the Grand 
Canon of the Colorado, Arizona. 
- A description is given and attention called to a conclusion resultant 
upon the study of a line of displacement, in which the throw of a 
fault of pre-Cambrian age was partially reversed by a movement in 
the later Paleozoic, and again in the same line during Tertiary time. 
- S. Williams.—‘‘ The Cuboidos Fauna” and the Principles of 
Determining Equivalency in Separate Regions of the Globe.—20 min. 
A. Winchell.—Pre-Silurian Rocks in North America. 
This memoir will probably be postponed until the December meet- 
ing. 
I. LeConte.—On the Origin of Normal Faults and of the Structure 
of the Basin Region. 
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