170 * THE COASTAL PLAIN OF NORTH CAROLINA.

THICKNESS
IN FEEt. Sa
60-65%. Gray, calcareous, finely micaceous clay, large pieces of

shells of Ostrea subspatulata and Exogyra sp. in sam-
i pies Wha ste aig FS EEA POLS Sook LEEK Save de 899-1140
Black Creek formation :

OO. tnent piamish. pinstic: Clay... fi Se 1140-1160
Deen: See MMMIN ES sos ep Ril ee et a oe 1160-1200
68%. Gray, calcareous clay, with a mixture of quartz pebbles

up to % inch in diameter and shell fragments. Con-

tains Bryozoa and Ostrea cretacea (?), etc......... 1200-1237
69. Clean, loose, slightly calcareous sand.................. 1237-1253
Pee oe SEE So sc Secrets Ot as oe os Be 1253-1259

Ph, CER STAY, Calcareous “€lays a. cce 2. enn 05 OP See a hee ole 1259
72-78. Light to dark pinkish or reddish, finely laminated clay . .1259-1322

oi 74. Light gray, calcareous clay, with an admixture of small

quartz pebbles as large as birdshot.................. 1826-1334
75. Coarse, argillaceous, caleareous sand................... 1842-1365

76-76a. Coarse sand and gravel with pebbles up to % inch in
diameter. Also, pieces of gray, calcareous sand-rock
and pieces of shells. Sample 76 contains Bryozoa,
Ostrea cretacea, Exogyra sp., Ctc.........c. ccc cee ee 1365-1380
77-78. Very coarse sand, many of the grains as large as bird-
. : shot, with small particles of gray, calcareous clay, and
with numerous fragments of shells................. - 1380-1405
~ 79-80. Coarse sand, with a large percentage of small particles
of gray calcareous clay, scattered grains of glauconite,
and numerous shell fragments, among them encrusting ;
we bryozoans. Sample 80 contains Bryozoa............. 1405-1440
_. $1. Coarse, loose sand and fine fragments of crushed sand- si
ae stone, filled with particles of iron oxide. Contains a
SOW GMO Tagen. S66 8S chee kant ss 1440-1442
82-83. Loose, white, nig ota ee sand, with a few shell frag-
RE es ah Pe ee ee er ag Ee ey Saas 1442-1455
8&4. Fine, dark gray, PO OROES shanty glauconitic sand.. . 1455-1470
85-86. Loose, gray, medium-grained slightly micaceous sand.. 1470-1490
_ 87. Fine, yellowish gray, glauconitic, micaceous sand........ E
88. Fine, dark gray, micaceous, slightly glauconitic sand. ...
89. Dark pinkish drab, arenaceous, micaceous clay.........- 1510-1
90. ‘Cosree, argillaceous sand and chunks of light gray and ete
: pink-mottled, coarsely arenaceous clay...... aig
91. Very fine, gray, a. glauconitic sand...... RiGee

2 ‘Basement Rock:

: a metamorphosed rock (possibly from an old eruptive?) having
a yery fine granular texture. Consists principally of inter-
locking quartz grains with considerable greenish mica flakes —
and grains of red iron oxide. There are also numerous grains
of epidote and some chlorite. A stretched apatite crystal ob-
"served in one slide. peered credited | to ‘Dr. Albert
Johannsen) ...... : ey