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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
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
Figure 27. Location of Strat-6 well at U.S. Marine Corps Air Station, Cherry Point, North Carolina.
| 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. |
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.
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.
| 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 |
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.
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