1 66 The American Geologist. September, 1905 
the whole is what might be called a clay green sand. Flakes 
of mica and grains of quartz and feldspar, chiefly orthoclase, 
but with some microcline, are numerous throughout the bed. 
Hornblende and pyroxene are also found but they are not 
so common. The beds weather readily under the influence 
of the atmospheric agencies and much trouble is experienced 
by those whose houses are built near the edge of the bluffs 
on account of the tendency of the material to slide down. 
In some places where there is a good deal of water per- 
colating over the embankment the material becomes hard 
and smooth and changes to a black color. The glauconite 
grains change the color to a brownish yellow, to a black, 
to a dark blue, to a dark green, or to a pea green, according 
to the state of decomposition. The beds contain pieces of 
lignite, and I collected one piece about 5 inches in diameter 
and about 8 inches long. It was broken out of a steep 
bank and part of it was left in the bank. Near the top of 
the Navesink marl is a clay iron stone layer 2 to 4 feet thick, 
containing numerous glauconite grains. These are held 
together by the cementing substances of the clay iron stone 
which is a mixture of limonite and clay. The iron may 
have been originally a chemical precipitate or it may have 
come in part from the breaking up of other glauconite 
grains which had been formed at an earlier period. Bed 1 
which is 4 feet to 20 feet thick is a clay containing numerous 
quartz and feldspar grains and mica flakes, and is charac- 
terized by the filling of limonite in the cracks, which are 
very numerous throughout. The color of the material of 
this bed is a light grey. Bed 2 is a mass of glauconite 
grains embedded in a clay of light grey color. This bed 
is in places made up of a mass of shells. It contains prac- 
tically no quartz or feldspar grains or mica flakes. 
For separation of samples from Navesink see table. 
In a sample (G 2 taken from Bed 2 (Gryphcea reticularis 
bed) there was practically nothing besides glauconite 
grains and a few shell fragments. Some grains of pyrite 
were found and some shells of Foraminifera (Nautilus type; 
Trochoid type ; Nucularia type ; Nodosaria type) were noted. 
In a sample (G 3 taken from bed 3) there is l / 2 quartz and 
y 2 glauconite. There are well formed crystals of gypsum 
