92 THE COASTAL pLAIN OF NORTH CAROLINA.

sands and clays, in most places a gravel band containing erratic bowl-
ders of quartz or crystalline rock being present at the base, the mate-
rials representing a continuation downstream of the terrace materials
exposed at and above Fayetteville,

Between mileposts 100 and 101 beds of the Black Creek (“Bladen”)
formation begin to appear in the bluffs, occupying shallow basins in the
eroded surface of the Patuxent beds and covered over by horizontal
Pleistocene deposits. The relations of the different materials are
roughly shown in Fig. 1.

 

 

About 300 feet ————___________»>
aie cack cles ee eee ee Bees Spnae bare
mileposts 100 and 101. i :

The Patuxent materials represented in the section are of the usual
character. In striking contrast to them are the materials occupying
the basins, which consist of dark laminated sands and clays, in places
containing considerable lignite, whose general aspect is the same as
that of the materials of similar character which make up the bluffs
farther down the river. They constitute the feather edge of the Black
Creek (“Bladen”) formation which overlies unconformably the Pa-
tuxent formation. This interpretation is confirmed by an observation

ray near Church Landing, right bank, about milepost 100. See