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