Davis and Wood.] 
402 
[Nov. 20, 
road finds entrance to Round Valley from the southeast, is proba- 
bly the abandoned site of a superimposed stream, whose beheaded 
remnant is Holland brook and whose headwaters have been led off 
westward to the Raritan by Prescott brook ; the change that is in 
store for the Lockatong being here already accomplished. 
On the other hand, the Ramapo, joining the Passaic near Pomp- 
ton, is a good illustration of a stream whose course shows no de- 
pendence whatever on the Cretaceous cover; it follows the line 
between the Triassic and the Crystallines, gathering small branches 
from either side, and not only giving no sign of inheritance from 
some extinct structure, such as the North Branch of the Raritan 
showed so clearly, but flowing in as close accord with the present 
structure as the Musconetcong. 
Taking these streams as guides, it may be concluded that the 
overlapping of the Cretaceous that resulted from the transgression 
of the Atlantic over the Schooley peneplain at the time of its slight 
depression, reached all across the Triassic formation in the middle 
and southwest side of the state, but not quite so far in the north- 
east. It undoubtedly oscillated back and forth many times about 
this line. The occurrence of inherited streams above the head of 
Chesapeake bay at some distance inland from the present margin 
of the Cretaceous cover, 1 and the general correlations allowed by 
the suppositions here brought forward, lend support to a conclusion 
that might otherwise be more easily questioned. 
28. Drainage of the Triassic area of the Central Plain. The 
streams of the Triassic area generally do not give unequivocal 
evidence of inherited courses. They are on the one hand suscep- 
tible of explanation as the revived successors of old streams whose 
position was determined during the long development of the old 
Schooley peneplain ; and on the other hand they might be regarded 
as superimposed from the drainage of the extinct Cretaceous cover. 
They are therefore not like the Lockatong and the Raritan in de- 
manding the former inland extension of the Cretaceous formation 
over the Triassic area ; but as that extension seems to be well 
proved, the best understanding of the Triassic drainage can be 
gained by regarding it as inherited. This conclusion seems to be 
more accordant than any other with the conditions of drainage far- 
ther south along our Atlantic slope. 
1 McGee, Z. c. 133, 134. It is the Potomac formation that McGee regards as having 
here stretched over the peneplain. 
