Link to the USGS home page Link to the MCAS Cherry Point home page

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


Strat-7

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

Return to the OFR 2004-1434 Home Page
North Carolina District Home Page


U.S. Department of the Interior, U.S. Geological Survey
Persistent URL:
Page Contact Information: Contact USGS
Last modified: Saturday, January 12 2013, 11:40:48 PM
FirstGov button  Take Pride in America button