Davis and Wood.] 
416 
[Nov. 20, 
The streams in the Highland valleys are well hemmed in, and their 
• present trenches are simply the product of Millstone revival on the 
Somerville valley bottoms, just as the Somerville valleys resulted 
from the revival of the streams on the Schooley peneplain. The 
same appears to be true of the Delaware and its side streams in the 
Kittatinny valley-lowland. The Raritan also seems to retain in 
good measure its Somerville course, for it runs against the slope of 
the plain from Bound Brook to New Brunswick after the fashion of 
antecedent streams ; but its traverse of the lower part of the plain 
near Bound Brook suggests that the Millstone tilting of the plain 
may have turned it somewhat to this special location. 
On the other hand, several smaller streams manifest in their di- 
rections so distinct an accordance with the slope that has been 
given to the Central plain since its formation, that they must be 
regarded as consequent upon the slope. Ambrose’s brook, fig. 
14, is an excellent example of this kind : it lies two or three miles 
northeast of the Raritan where the latter runs from Bound Brook 
to New Brunswick ; but while the larger stream flows southeast 
against the slope of the plain, the smaller one flows northwest with 
the slope. A number of streams to the west of the Raritan are 
probably of similar origin. 
But the most remarkable case of this kind is that of the Mill- 
stone. Here we have a river of some length, with a number of 
head branches, all flowing northwestward, as if they had been given 
that direction by the tilting of the Central plain. The same course 
is seen in the Rancocas, and in other smaller streams farther south- 
west, on the same Cretaceous portion of the Central plain. But 
the Millstone has not only this reversed course ; it crosses the fall- 
line dislocation against its uplift; and in this it has no fellow as 
far as the fall-line has been traced. 1 The history of the case ap- 
pears to be as follows. 
35. Reversal of the Millstone river. All that is known of the 
processes of the Somerville cycle indicates that central New Jer- 
sey must then have acquired a drainage directed in general to the 
Un McGee’s maps of the fall-line displacement, Seventh Ann. Rep. U. S. Geol. Sur- 
vey, Pis. lvii and lxvii, South river is also drawn as if crossing the fall-line against 
the heave before joining the Raritan ; but it appears more probable that the prolonga- 
tion of the main line of displacement runs as here drawn though perhaps with dimin- 
ishing throw ; and that the northeast-southwest course of South river is due to another, 
parallel and subordinate displacement. Farther south in Pennsylvania, Delaware, 
Maryland and Virginia, all the streams that cross the fall-line run from the northwest 
to the southeast. 
