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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


Strat-6

Map showing location of Strat-6 well

Lithologic log for Strat-6 test hole

Selected borehole geophysical logs collected in Strat-6 test hole displayed to a depth of 250 feet, U.S. Marine Corps Air Station, Cherry Point, North Carolina.

Selected borehole geophysical logs collected in Strat-6 test hole, U.S. Marine Corps Air Station, Cherry Point, North Carolina.

Strat-6 monitoring-well construction report

Periodic water levels in Strat-6 monitoring well

Hydrograph showing ground-water levels in Strat-6 monitoring well, September 2000–August 2002


Generalized map of MCAS showing location of Strat-6 well
Figure 27. Location of Strat-6 well at U.S. Marine Corps Air Station, Cherry Point, North Carolina.

Table 17. Lithologic log for Strat-6 test hole, U.S. Marine Corps Air Station, Cherry Point, North Carolina.
 
[%, percentage; <, less than; mm, millimeter]
Depth below land surface (in feet) Description (compiled by B.M. Wrege)
0.0 – 1.0 Topsoil A'B' horizons.
1.0 – 25.0 Interbedded layers of SAND and CLAY, layers range from 0.2 to 0.8 inch thick.
Clay in coarse sand, 10YR6/6.
Clay, gray, lenticular deposition in gray stringers. Silt, ochre, with coarse sand.
Clay, lenticular, orange and gray.
Clay, orange-brown.
Silty clay.
Sand.
25.0 – 25.4 CLAY, silty, sandy, gray-blue.
25.4 – 31.9 SAND, shelly, light gray. Phosphatic – grain size on phosphate is coarse. Shells angular.
30.0 – 31.9, increase in % fine sand, decrease in shells.
31.9 – 33.0, increase in shell % and size. Formation is still sand, shelly.
35.0 – 37.4, increase in phosphates. 37.4 – 37.9, both percentage and grain size = 0.3 inch, shell fragments to 0.8 inch.
31.9 – 40.0 Layers, SAND, CLAY, sand with shells. Phosphate to 0.4 inch.
40.0 – 45.0 SAND, medium, gray, fairly well graded, fine – silt, absence of phosphate, fining downward.
45.0 – 50.0 SILT with very fine sand, trace phosphate, increasing % of clay.
50.0 – 58.2 CLAY, dark olive-green.
48.2 – 60.0 Nodular phosphate, black, high luster, 0.1- to 0.4-inch subrounded, flat, smooth pebbles, trace glossy pink minerals, dup sed in a clayey, sandy, silt matrix. NOTE: Medium sand, coarse sand, fine gravel – absent.
60.0 – 68.0 SAND, fine with significant % phosphate pebbles, dark olive-green. Sandy silt matrix with phosphate nodules from 0.1 inch to a bone fragment 1.3 inches long. Sharks' teeth.
68.0 – 80.0 SAND with weathered quartz and phosphate pebbles, light yellow-gray sand, quartz glauconite subrounded, well graded, uniform, medium to medium fine.
78.0–80.0, increase in size of pebbles.
80.0 – 86.0 CLAY, light gray, uniform, very few inclusions; core had a coating of manganese ribbons on exterior at time of recovery.
86.0 – 92.0 SAND, medium to fine with zones of phosphate and layers of clay.
92.0 – 105.3 SANDSTONE with consolidated to poorly consolidated sandstone and sand with phosphate nodules. Uniform graded, medium to fine sand, flossy matrix.
105.3 – 105.7 CLAY, 5Y4/1.
105.7 – 106.1 SHELLS in sand matrix, 5Y4/1.
106.1 – 107.0 Thin 0.4- to 0.5-inch layers of SAND and CLAY.
107.0 – 110.2 CLAY, silty with fine to very fine sand.
110.2 – 119.6 SAND, silt with fine sand, clay lenses.
110.4–111.7, dry, hard, uniform sand, silty, clayey, light, very fine.
112.0, SAND, shelly.
115.0, SAND.
116.0, CLAY.
117.5, SAND.
119.6 – 122.0 SAND, fine, shelly, infilled burrows, traces of phosphate.
122.0 – 128.0 LIMESTONE, sandy, shelly, variably cemented transitioning from competent to very fine sand with shells.
125.0–133.0, sandy, becoming coarser downward to fine gravel.
128.0 – 129.3 LIMESTONE, consolidated, competent, medium gray, small <0.3 voids, compressed, very small crystals, no free shells, transmissive.
128.5, calcarenite, carbonate cementation.
129.3 – 130.0 SAND and SHELLS, shells 0.1–0.4, subangular, gray, subrounded quartz pebbles.
130.0 – 149.7 SAND (NOTE: Upper Pungo River Formation). Transmissive, medium-coarse, clean, with shell fragments grading to zone (0.6 ft) of coarse gravel, subangular with full range of mineral varieties.
138.0–142.0, sand zone of pink barnacles 0.25–1.3 inch, somewhat consolidated sand – sandstone matrix.
140.0–150 0, no shells, shell fragments, coarse or gravel-sized particles, rounded to subrounded, frosted.
149.7 – 170.5 Oysters, lagoonal deposition, large mollusks in green clay matrix, shell size limited to diameter of core barrel. Significant number of large shell slices (greater than 4 inches), holes about 0.5 to 0.7 mm in shells.
170.5 – 180.5 Weathered LIMESTONE, shelly, limey, very low to non-transmissive, casts, no shells above 175 ft, thin shells in tight clay in lower portion.
180.5 – 185.0 CLAY with sand, rounded, weathered cobbles, size limited by core barrel.
185.0 – 192.2 CLAY, shelly.
192.2 – 194.5 (Transition zone) Weathered LIMESTONE, yellow-gray calcite crystals.
194.5 – 199.2 Weathered LIMESTONE, gray sand – cobble size, poorly consolidated, pelecypod casts, no distinct shells.
199.2 – 208.3 LIMESTONE, weathered, sandy, calcareous layers of medium-grained sand. Yellow-gray.
208.3 – 223.7 LIMESTONE, moldic vuggy, light gray with yellow. Calcite crystals, clean, very high transmissivity, vuggs to 1.2 inches, clast pieces 0.4 to 0.5 inch.
222.0–223.7, becomes coarser from sand to pea gravel.
223.7 – 225.0 No recovery; driller suggests fine sand.
225.0 – 241.1 SAND, uniform, unconsolidated fine to medium, trace silty, moderate to low transmissivity.
241.1 – 242.1 LIMESTONE, weakly cemented.
242.1 – 242.9 SAND, uniform, shelly, dirty.
242.9 – 250.0 Transition zone.
245.0, layer of sand.
246.0, layer of sandstone, competent.
247.0, layer of shell hash.
248.0, layer of sandstone, fractured.
249.0, layer of sand.
250.0 – 251.7 LIMESTONE, vuggy, moldic, calcite crystals in vuggs, medium gray with yellow, weathered sandstone pieces, intersperses.
251.7 – 266.0 SAND, fine, uniform, light gray with glauconite or heavy metal, very fine, low percentage (<5%) inclusions.
266.0 – 266.8 Hard sandstone with fossils <0.3-inch thick, layered with very fine sand, uniform, clean.
266.8 – 292.2 SAND, uniform, well graded, medium fine to very fine, light gray, no shells, heavy metal, very fine <5%.
292.2 – 292.8 Transition zone. Iron oxide, sand and shell hash, limey, black infilling, dark gray.
292.8 – 305.0 LIMESTONE, moderately compressed, moderately cemented, vuggy, light gray.

generalized lithology with selected borehole geophysical logs for Strat-6 well to a depth of 250 feet
Figure 28a. Selected borehole geophysical logs collected in Strat-6 test hole displayed to a depth of 250 feet, U.S. Marine Corps Air Station, Cherry Point, North Carolina.

generalized lithology with selected borehole geophysical logs for Strat-6 well
Figure 28b. Selected borehole geophysical logs collected in Strat-6 test hole, U.S. Marine Corps Air Station, Cherry Point, North Carolina.


Figure 29. Strat-6 monitoring-well construction report, U.S. Marine Corps Air Station, Cherry Point, North Carolina.

Table 18. Periodic water levels in Strat-6 monitoring well, U.S. Marine Corps Air Station, Cherry Point, North Carolina.
Date Water level, in feet below land surface
09-21-2000 11.05
02-09-2001 11.43
05-03-2001 10.78
08-09-2001 12.72
03-29-2002 11.53
05-15-2002 12.16
08-16-2002 13.61

hydrograph for strat-5 well from September 2000 to August 2002
Figure 30. Hydrograph of ground-water levels in Strat-6 monitoring well, U.S. Marine Corps Air Station, Cherry Point, North Carolina, September 2000– August 2002.


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

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