Open-File Report 2004–1434
By Beth M. Wrege and Philip S. Jen
Map showing location of Strat-8 well
Lithologic log for Strat-8 test hole
Selected borehole geophysical logs collected in Strat-8 test hole
Strat-8 monitoring-well construction report
Figure 35. Location of Strat-8 well, U.S. Marine Corps Air Station, Cherry Point, North Carolina.
|Depth below land surface (in feet)||Description (compiled by C.C. Daniel, III)|
|0.0 – 1.0||Missing.|
|1.0 – 3.7||Silty CLAY, tan to orange.|
|3.7 – 6.0||Fine to medium SAND, grayish with bits of carbon/charcoal.|
|6.0 – 14.0||White to light gray, very fine sand with scattered clay-silt balls, blue-gray clay balls.|
|14.0 – 16.4||Gray to buff non-fossiliferous CLAY with thin sand layers, storm sand layers.|
|16.4 – 24.0||CLAY, fossiliferous with pelecypods, silty, gray clay, fewer shells at top of interval.|
|24.0 – 24.4||SAND, sandy carbonate.|
|24.4 – 24.8||Gray CLAY, some shells.|
|24.8 – 29.0||Sand? Washout?|
|29.0 – 30.0||Shell hash, some whole shells, gray silty clay.|
|30.0 – 48.6||CLAY, gray silty; scattered shells and shell fragments, some fine sand toward base of interval, a few phosphate grains.|
|48.6 – 52.2||SAND, shells, and shell hash, phosphate grains, small pebbles, some silty clay toward top.|
|52.2 – 58.0||SAND and abundant shell hash, shells and fragments, 10–20%, small quartz pebbles 2–4 mm phosphate.|
|58.0 – 61.0||Calcareous SAND, limey some phosphate.|
|61.0 – 62.0||Sandy chert, grayish-green chips.|
|62.0 –63.5||CLAY, silty, greenish.|
|63.5 – 66.0||Abundant quartz pebbles at base, clayey silt.|
|66.0 – 70.0||Calcareous SANDSTONE, fossiliferous with pelecypods, moldic in part shell fragments, 69–70 ft.|
|70.0 – 78.5||Silty, clayey SAND, fine to medium.|
|78.5 – 81.0||Cemented calcareous SAND.|
|81.0 – 89.8||Sandy, silty CLAY, grayish-green, very fine sand/silty at base.|
|89.8 – 96.5||Calcareous SANDSTONE. Moldic limestone layers, thin.|
|96.5 – 103.5||SAND with quartz pebble layers, calcareous. Abundant pebbles 3–6 mm diameter. Sand, partially cemented, hard zones, shell fragments, light gray.|
|103.5 – 105.3||Calcareous fossiliferous SANDSTONE with hard, cemented layers.|
|105.3 – 126.0||Greenish-gray silty CLAY with thin shell-hash layers and scattered phosphate grains and small pebbles 2–3 mm, shell fragments scattered through the interval.|
|126.0 – 129.5||Sandy, silty shell hash with shell fragments 2–3 cm.|
|129.5 – 130.5||Green CLAY with storm sand streaks/lenses.|
|130.5 – 143.9||134.5–135, sand lenses.
142.0–143, shell hash, sandy, silty, uncemented thin clay lenses near base of interval, phosphatic at base, large oyster shells.
|143.9 – 160.0||Moldic LIMESTONE; shells have been removed by dissolution, interstitial material is silty, micritic and minor clay to 148 ft. Weakly cemented/friable to 160 ft.|
|160.0 – 165.5||Gray moldic LIMESTONE, indurated/hard micrite.|
|165.5 – 191.9||Light tan to buff moldic LIMESTONE, competent to friable, very sandy matrix, calcareous cement, small scattered phosphate grains, nearly all shell material removed by dissolution, calcite crystals (spar) occur as druse on mold-void surfaces.
186–191.9, sand increases.
|191.9 – 210.0||Fine to very fine, well sorted SAND, subrounded to angular, abundant, fine phosphate grains 2–3% "salt and pepper."|
|210.0 – 210.4||Cemented sand/chert.|
|210.4 – 215.0||Fine to very fine, well sorted SAND, subrounded to angular, abundant, fine phosphate grains, 2–3% "salt and pepper."|
|215.0 – 215.3||Cemented sand/chert.|
|215.3 – 220.0||Fine to very fine, well sorted SAND, subrounded to angular, abundant, fine phosphate grains, 2–3% "salt and pepper."|
Figure 36. Selected borehole geophysical logs collected in Strat-8 test hole, U.S. Marine Corps Air Station, Cherry Point, North Carolina.
Figure 37. Strat-8 monitoring-well construction report, U.S. Marine Corps Air Station, Cherry Point, North Carolina.
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