and the Northern part of New York Isiand. 431 
there are undulations in the beds with dips of 45° to 30° and 
less, both eastward and westward, corresponding with a widen- 
ing out of the anticlinal. These undulations (of which there 
are successions across the region) are well shown in Melrose, on 
Elton Avenue, above 159th Street (see map), and also near 
30. : 
SESS Serene 
GZZEWN ENO 
LN Z 
EWN ANS L\Q[SI 
156th and 155th Streets, (fig. 30, representing a length of 
thirty-five yards) and on 150th Street, east of Cortlandt Avenue 
(fig. 31, representing a length of one hundred yards). There 
are outcrops also on 149th Street. 
Farther south, about 140th Street, or below this, the lime- 
stone area is divided into two bands, an eastern and western, 
separated by schist—whether underlying or overlying schist, is 
considered beyond. : 
he outcrops of schist which prove this occur to the south, 
between 133d and 136th Streets, east of Willis Avenue (a spot 
marked by T-symbols on the map). The micaceous beds are 
iver. It probably extends on beneath the low, now grass- 
covered, grounds of the west side of Randall Island, the once 
en low when civilization took possession. 
referred to occurs on Kast River, fifty feet north of 123d Street, 
and is exposed only at low tide. The micaceous gneiss is thin 
schistose, and the beds have a strike of N. 26° E., with the 
