1895. | NEW YORK ACADEMY OF SCIENCES. 
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The method of procedure was to start with the geologically 
lowest layer in each section, measure, and, collecting a quantity 
of representative material from each successive distinct layer, 
assign to each a consecutive number, as described in the case of 
similar work by the writer last summer on Lake Champlain.* 
The field numbers have been retained in the left-hand margin 
of the sections described in the present paper, although in some 
cases several layers distinguished in the field have been com- 
bined, as will be seen, where subsequent laboratory study failed 
to detect sufficient distinction between them to warrant their 
separation. 
* Trans. INS Acad. Sci. XV., 19 (1895). 
