1 72 The American Geologist. September, 1905 
rest grains of glauconite cemented by clay. No mica flakes 
noted in this sample. It is a very dark color which may in 
part be due to the presence of a certain amount of vegetable 
matter. It lies below the lighter colored green sand of the 
Navesink (samples C a and C) and rests above Bay View 
lens No. 3. 
The Ma taw an Formation. 
In the western part of the Atlantic Highlands section 
the Mt. Laurel sand is underlaid by a quartz sand forma- 
tion 35 feet thick, which can be traced eastward for 800 feet 
when it merges into the Marshalltown clay. 
The Matawan divisions at Atlantic Highlands are in- 
cluded under Clark's Hazlet sand or Upper Matawan. The 
divisions are "Bay View Avenue sand," (which I have named 
provisionally, which represents uppermost Hazlet, and may 
be Knapp's Wenonah sand). Below this sand, near Bay 
View avenue, is 30 feet of the dark laminated Marshalltown 
clay. This latter is 43 feet thick at the eastern end of the 
section where it has replaced the Bay View Avenue sand. 
Below this forming the base of the section throughout is the 
Columbus sand which grades upward into the Marshalltown 
clay. The Marshalltown clay here is at the top marked by 
an unconformity. 
The Matawan beds at Atlantic Highlands are not very 
fossiliferous, and besides fragments of a crab's claw there 
were few fossils obtained from them. 
From samples examined with the microscope it was 
shown that the material composing the beds was largely 
quartz grains both rounded, flattened, and angular, together 
with some glauconite grains and mica flakes. Also in some 
samples hornblende, gypsum, pyrite, serpentine, orthoclase, 
microcline, pyroxene, etc. were found. There is more or 
less clay with glauconite grains either disseminated or in 
pockets. The strike is northeast to southwest — dip 25 feet 
to the mile as given by Clark. 
Following are the detailed characters of the various 
members of the Matawan series beginning with the highest. 
Bay View Avenue Sand. 
This is so named from Bay View avenue station near 
Atlantic Highlands where it occurs. It is from 15 feet to 
