12 TRANSACTIONS OF THE [ocr. 15, 
however, introduced (see Fig. 1) an ideal section to serve as the 
general type of the morainal structure under discussion, with 
which these and sections from other localities may be compared. 
The Gay Head escarpment is unique, however, as it presents 
the most extensive section of the moraine from base to summit 
which we have anywhere exposed in the region. 
Fic. 1. IDEAL SECTION THROUGH THE TERMINAL MORAINE, 
Proceeding westward we find a similar structure to exist on 
Long Island, although the exposures are far more limited. 
Nevertheless, at Cold Spring (see Fig. 2), Northport and Glen 
lane 
in Eat 
MDL fase 
aba el 
Fig. 2, DistoRTED CLAYS AND SAND, Coup Sprine, Lone IsLanp. 
Cove, examples may be seen in miniature, and we have only to 
imagine Long Island separated into parts, by convenient north 
and south erosion channels, in order to reproduce indefinitely, 
Martha’s Vineyard, with Gay Head. 
