36 
PENNSYLVANIA ANORTHOSITES 
Cambrian time, is indicated by the fact that in the Honeybrook 
area the basal formations of the Paleozoic formations (Cambric 
quartzite series) were laid down directly upon the crystalline floor. 
Deposition in Paleozoic time, in the Piedmont upland, was prob¬ 
ably confined to the Cambric and Ordovic periods during which 
arenaceous, arenaco-argillaceous, calcareous, and argillaceous sedi¬ 
ments were laid down along the borders of the Appalachian Sea. 
Of these sediments, which were closely folded by the end of the 
Paleozoic era, only the arenaceous (Cambric quartzite series) 
and the calcareous (Cambrio-Ordovicic limestone series) are found 
in the Honeybrook tract. “The uplifting of the sediments above 
the sea was probably not a continuous process, but intermittent, 
and while erosion did not keep pace with the upward movement, 
Paleozoic topography undoubtedly never exhibited a constructional 
form, i.e., the arches and troughs of the folded crystallines never 
existed unmodified by erosion. Before the beginning of the next 
period of sedimentation of which there is a record (Triassic), 
they had been eroded to a relatively even surface.” (Bascom). 
Triassic sedimentation is well represented in this region. The 
Stockton, Lockatong and Brunswick formations occupy the north¬ 
ern third of the Honeybrook area-where they were laid down 
successively in the shallow waters of the trough-like, inland basin 
bordering the crystallines on the northwest. The trace of the 
surface of unconformity at the base of the Triassic sequence 
marks the line of division between the Triassic lowlands and the 
Piedmont uplands. Igneous action during Triassic times is repre¬ 
sented by extrusions and intrusives of basalt and diabase, as 
flows, sills and dikes. Diabase occurs in the Honeybrook region 
in small, narrow, discontinuous dikes and larger irregular dike-like 
masses. The former are scattered throughout the tract, while 
the latter seem to be almost entirely confined to the Triassic 
formations.. These igneous intrusions represent the youngest 
rocks in the region. From the close of Triassic times to the 
Present time there has been no submergence of this district. Be¬ 
ginning with post-Triassic time, the river systems drained to the 
southeast into the Atlantic Ocean. The streams have in general 
retained their courses to the present day, and denudation of the 
region has been continuous except for minor pauses and accelera¬ 
tions. 
