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Data from Stratigraphic Test Holes Drilled at the U.S. Marine Corps Air Station, Cherry Point, North Carolina, 1994–2001, and Periodic Water Levels, 2000–2003

Open-File Report 2004–1434
By Beth M. Wrege and Philip S. Jen


Map showing location of Strat-7 well

Lithologic log for Strat-7 test hole

Selected borehole geophysical logs collected in Strat-7 test hole

Strat-7 monitoring-well construction report

Periodic water levels in Strat-7 monitoring well

Hydrograph showing ground-water levels in Strat-7 monitoring well, September 2000–May 2002

Generalized map of MCAS showing location of Strat-7 well
Figure 31. Location of Strat-7 well, U.S. Marine Corps Air Station, Cherry Point, North Carolina.

Table 19. Lithologic log for Strat-7 test hole, U.S. Marine Corps Air Station, Cherry Point, North Carolina.
[ft, feet; mm, millimeter; cm, centimeter; %, percent; <, less than]
Depth below land surface (in feet) Description (compiled by C.C. Daniel, III)
0.0 – 0.9 "A" horizon; soil zone gray, very fine sand, silty minor clay, roots.
0.9 – 4.0 Grayish-tan silty SAND, very fine sand.
4.0 –5.5 Orange, very fine SAND, silty, some clay.
5.5 – 7.5 Orange CLAY.
7.5 – 11.0 Yellowish-orange very fine SAND, silty, some thin clay disseminated through interval—thin sand layers (0.1 ft) with little clay color 5Y8/4.
11.0 – 17.3 SAND, well sorted, subrounded, frosted yellowish-gray sand, very fine.
17.3 – 17.7 CLAY.
17.7 – 19.6 Yellowish-gray SAND, very fine.
19.6 – 21.5 Grayish-orange CLAY.
21.5 – 27.5 Sandy CLAY with thin storm sands, heavy mineral lenses, grayish-yellow 5Y8/4 to pale yellowish-orange 10YR8/6.
27.5 – 28.8 Silty sand, clay 10YR6/6.
28.8 – 30.0 Silty clay, light olive-gray 5Y6/1.
30.0 – 32.0 Sandy CLAY—coarse, poorly sorted sand, fraction small pebbles 2–12 mm, well rounded.
32.0 – 44.6 SAND—coarse sand, moderately sorted, well rounded, frosted.
44.6 – 60.5 Fine to very fine SAND with some silt and clay. Sand angular to subrounded. Light olive-gray 5Y5/2. Sparse, widely scattered phosphate and quartz pebbles, 1-to 6-mm long dimension. Phosphate and quartz pebbles below 60 ft increase in size and abundance.
60.5 –64.0 62.0–64.0 ft, quartz pebbles to 1 cm, phosphate pebbles to 2 cm.
64.0 – 65.2 Carbonate lag gravel, shell hash, with quartz and phosphate up to 3 mm.
65.2 – 68.3 Fossiliferous carbonate, light gray N7.
68.3 – 71.5 Sandy, silty, shell hash with scattered phosphate.
71.5 – 73.4 CLAY.
73.4 – 86.2 SAND with a few clay lenses, a few widely scattered quartz pebbles, well rounded, 3–5 mm. Fine to very fine sand, angular to subrounded scattered phosphate, fine to very fine, 1–2%.
86.2 – 90.0 Clayey, silty SAND.
90.0 – 93.5 Sandy CLAY with clay rip-up clasts, light gray N7 to very light gray N8 with no sand, slick when wet.
93.5 – 100.3 Silty, sandy CLAY to silty clayey SAND with shell fragments, chalky thin-walled bivalves. A few phosphate pebbles 2–3 mm, medium light gray N6 to medium greenish-gray, very fine sand fraction.
100.3 – 102.5 Silty, yellowish greenish-gray CLAY.
102.5 – 124.5 Fossiliferous sandy CLAY with abundant shell hash, lag gravel zones.
102–105, chert and chert fragments.
115–115.6, moldic, limestone, clay, yellowish-gray 5Y7/2.
123.9–124.5, sand content increases, contains shell fragments; interval has increased quartz and phosphate well-rounded pebbles 4–8 mm in diameter.
124.5 – 134.7 SAND, well sorted, fine; 1% phosphate of similar size, scattered phosphate pebbles 2–4 mm, scattered shell fragments subangular to rounded, partially frosted. 10YR7/1 light gray.
134.7 – 154.8 Fossiliferous CLAY, sandy, contains large shell fragments <2 inches in diameter of core contains chert nodules, some with chalky coating. Light greenish-gray 5G7/1. Sandy fraction decreases upward, size decreases. 153–154.8, shell hash with quartz pebbles, phosphate nodules, quartz and phosphate 3–9 mm, sandy-clay matrix, large shell fragments.
154.8 – 198.0 LIMESTONE, carbonate – interlayered sequence of porous calcarenite moldic limestone and friable to very friable moldic limestone, also includes lag gravel of carbonate fragments. Rare pieces of mother-of-pearl and chalky shells remain at places in the section. Sand in section is fine to medium, well rounded, and frosted. Minor phosphate mixed with the sand. Grayish-tan-buff color, may have some silt-clay in matrix.
198.0 – 210.8 LIMESTONE, "dirty" moldic limestone at top, gray 5Y7/1. Moldic limestone – "clean," light tan yellowish-gray 5Y8/1. Large voids up to 1.5–2 cm. "Dirty" moldic limestone at base of interval 5Y7/1.
210.8 – 212.0 LIMESTONE, "lag gravel" limestone fragments.
212.0 – 214.0 LIMESTONE, calcarenite – no megafossils.
214.0 – 214.5 LIMESTONE, "lag gravel" limestone fragments mixed with calcarenite (shell hash, plates?).
214.5 – 257.5 LIMESTONE, calcarenite – no megafossils. Small limestone fragments, plates? Small shells and shell fragments leached out 10YR8/1 very pale yellowish-gray. Friable to indurated/cemented sand. Sand is fine to medium, moderately well sorted, subangular to rounded, 1–2% phosphate sand-size grains. Scattered plates (carbonate/aragonite?).
257.5 – 264.0 LIMESTONE, calcarenite with shell, shells are chalky, appear to be bivalve shell fragments, aragonite (?); plates, 263–264.
264.0 – 265.0 LIMESTONE, moldic.

generalized lithology with selected borehole geophysical logs for Strat-7 well
Figure 32. Selected borehole geophysical logs collected in Strat-7 test hole, U.S. Marine Corps Air Station, Cherry Point, North Carolina.

Figure 33. Strat-7 monitoring-well construction report, U.S. Marine Corps Air Station, Cherry Point, North Carolina.

Table 20. Periodic water levels in Strat-7 monitoring well, U.S. Marine Corps Air Station, Cherry Point, North Carolina.
Date Water level, in feet below land surface
09-21-2000 17.33
10-05-2000 17.15
02-09-2001 17.60
05-03-2001 17.92
08-09-2001 18.74
03-29-2002 16.71
05-15-2002 18.23

hydrograph for strat-7 well from September 2000 to May 2002
Figure 34. Hydrograph of ground-water levels in Strat-7 monitoring well, U.S. Marine Corps Air Station, Cherry Point, North Carolina, September 2000– May 2002.

Abstract || Introduction || Methods || Test Hole Descriptions || Seismic Data || Marine Seismic Data || Land Seismic Data || Summary || References || Appendix

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