374 HENRY B. KUMMEL 
lenses of light-colored clay and occasional lenses of gravel. This 
formation outcrops over a wider area of the coastal plain than any 
of those heretofore discussed. Obscure casts of molluscan shells 
have been found in it, but these are of no value in determining its 
age. Plant remains from near Bridgeton indicate a flora comparable 
with that of certain European upper Miocene localities. It dips 
southeastward 9 or ro feet per mile, and overlies the Kirkwood with 
seeming unconformity. 
Inasmuch as sands and clays similar to the Cohansey are revealed 
in borings along the coast and there overlie clays carrying Miocene 
fossils characteristic of the St. Marys, the highest division of the 
Chesapeake group, the Cohansey apparently belongs to a still later 
stage of the Miocene or perhaps even to the Pliocene. It is possible, 
however, that as now defined it may represent in part at least the 
shoreward phases of the fossiliferous Miocene clays found in the 
borings along the coast, and that it should be correlated with the 
Choptank and St. Marys of Maryland. In the light of all data at 
present available, however, the former view seems most probably 
the true one. 
PLIOCENE SYSTEM 
Beacon Hill jormation.—Under the term Beacon Hill there were 
described certain beds of gravel and sand occurring as outliers 
on the higher hills of Monmouth County. Later the sand beds were 
correlated with the great body of sand now included in the Cohansey 
formation, leaving only the gravel in the Beacon Hill formation. It 
is chiefly quartz, but contains much chert and some hard sandstone 
and quartzite. ‘The chert pebbles are uniformly much decayed and 
are frequently very soft. ‘The quartz and quartzites are often more 
or less corroded. ‘The formation occurs as isolated remnants on 
some of the highest hills of the coastal plain. It is perhaps to be 
correlated with the Lafayette formation farther south. 
PLEISTOCENE SYSTEM 
The Pleistocene formations of New Jersey are glacial and non- 
glacial, the former occurring in the northern counties, the latter 
chiefly on the coastal plain. ‘The glacial or glacially derived deposits 
will first be considered. 
