Bulletin 23. Potash in the Greensands of NJ, 1923 - State of New ...

_4 POTASR IN TIIE GREENSAIVDS OF igEW JEI_]_Y.
W_g_
DATA,
According to Twitehell _ six wells have been drilled at Salem for
J. Q. Davis, east of the railroad station, on the margin of the meadow I
adjoining Fenwick Creek, at an elevation of 3 to 5 feet. Three of
these wells are 130 feet deep and three 100 feet. The water rises
within 1 or 2 feet of the surface. As is shown by the record below,
the wells start in the Vincentown sand_ which, with a foot of overlying
marsh mud, constitutes an overburden of 20 feet. The combined
Hornerstown and Navesink marls are 35 feet thick, and the
water is taken from the underlying Mount Laurel and Wenonah
sands.
Record of well of J, Q. Davis, at locality 5, Salem,
[Elevation, 3 feet; depth, 130 feet.]
Formation,
Mal_hlllu(_ root_, e_(l............ I I
19 [ 20 f Vtneentowm
Yellow with _o_tlo grea_nd
10 I 30 I Hona_rstown &lid Nav-
Ollve-g_n marl eslnk. •
Green mar _slightly lighter in evlor .... 1 55 Do,
o. oooo.rl °I Oo
Sandwith_elemniCesandsomofzagm_tsofsh¢ll .......... 60 Mount Laurel and
Wenonal_.
Sand, water bearing 70 I la0 I DO.
If Twitehell's interpretation of the record at loeMity 5 is correct
the boundary between the Vincentown and Hornerstown should be
drawn far enough west to include at least this locality.
A well at Oakdale farm (locality 6), about a quarter of a mile
southeast and down the dip of the beds from locality 5, shows 40
feet of marl beneath an overburden of 30 feet of clay, gravel, and
sand.
Recordof well of StewartCravenat locality6, Salem.
[About 0.4 mile 8. 52 _ E. from railroad station, on south side of street. Elevation, _bout 10 feet. C, C,
H olladay, driller and/_1ormant.]
Thick- Depth. Formation.
ne_.
Feet. J_eet.
30 Pleisto_ne and Yin-
Clay, gravel, sand .......................................... 20 cent ovra (?),
Blueaadbte_kmarl ........................................ 0 76 Hornarstown and
Nav_sin_
Sa_d with somemarl mixed in it (marlmay have come from 10 80 :_otmt Laurel and "W_
above),
nonah.
Sa_d _th good water ..................................... 23 103 Do.
It seems likely that much of the overburden here is Pleistocene
rather than Vincentown. The same statement is probably true
regarding localities 1 to 4, as shown by the detailed records. At
locality 5 also Pleistocene beds may form a larger shard of the overburden
than is thought by Twitchell.
Twitchsll, _. W., _t_pubE_hed manuscript,
NEW JERSEY GEOLOGICAL SURVEY