LOWER CRETACEOUS. 99

SECTION AT A. C, L. R. R. BRIDGE A SHORT DISTANCE ABOVE
MILEPOST 94, RIGHT BANK.

Pleistocene: Freer.
ellow clay AGM 520s eve sntes osc ava poems Uae ee 3
Yellow sand, becoming coarser towards base...........+..2cee00e 7
Gravel band with pebbles and cobbles of all sizes up to 4 or 5

inches in diameter, and many pieces of silicified wood.......... at
(Unconformity.) 4
Cretaceous:

Black Creek formation:
Laminated, cross-bedded, dark clay and gray micaceous sand, con-
taining lignite and iron sulphide concretions.................-- 5
(Unconformity.)
Patuxent formation : :
Compact. drab: clays (is 0s Pee oivesipea ean eee a ees eee 3

On Contentnea Creek there are occurrences of Patuxent strata from
1 mile above Woodard Bridge 8 miles south-southeast of Wilson, to
within 1 mile of Contentnea in Greene County. These exposures
are mostly low, at but few places rising more than 5 or 6 feet above
the water, the maximum height being about 15 feet. Between the first
exposure at the locality indicated and a point 2 miles below Speights
Bridge the beds overlying the Patuxent formation are of Miocene
age, except where the latter have been removed by Pleistocene terrac-
ing processes. The low terrace sections reveal either Pleistocene deposits
overlying Patuxent beds or Pleistocene beds only. From the locality
2 miles below Speights Bridge to the last exposure of the Patuxent
formation near Contentnea the sections are all cut in the lowest Pleis-
tocene terrace, and reveal at their base either Patuxent beds alone,
or Patuxent beds overlain unconformably by. Black Creek beds, or
Black Creek beds only. The undulating contact rises and falls above
and below the water level in such a manner as to reveal one or the
other or both of the formations, the Patuxent, however, finally pass-
ing beneath the overlapping Black Creek beds about 1 mile above Con-
tentnea. (For sketch map of Contentnea Oreek, see Fig. 4, p. 96.)

A detailed account of the Contentnea Creek exposures is given below.

The first appearance of the Patuxent formation is at a point about
1 mile above Woodard Bridge, Wilson —_— the section —_
as follows:

SECTION 1 MILE ABOVE WOODARD BRIDGE, RIGHT BANK. “ane

ae but in part Pleistocene and in Bert ere: Dunes. hee
Miocene:
Dark drab clay, with soft casts. “pebble ae at BARC. {. 45402 2
(Unconformity.) pa cen