Open-File Report 2004–1434
By Beth M. Wrege and Philip S. Jen
Map showing location of Strat-9 test hole
Lithologic log for Strat-9 test hole
Selected borehole geophysical logs collected in Strat-9 test hole
Figure 38. Location of Strat-9 test hole at U.S. Marine Corps Air Station, Cherry Point, North Carolina.
|Depth below land surface (in feet)||Description (compiled by C.C. Daniel, III, and B.M. Wrege)|
|0.0 – 1.0||Soil zone, roots 10YR2/2.|
|1.0 – 2.4||Coarse, poorly sorted SAND, silty-clayey matrix. Dark yellowish orange 10YR6/6.|
|2.4 – 3.5||Lost, sand?|
|3.5 – 5.0||Silty sand and SAND. Silty, fine sand|
|5.0 – 6.5||Lost, sand?|
|6.5 – 7.7||Fine to very fine sand, light gray.|
|7.7 – 15.5||CLAY, silty, sandy clay, mottled color ranges from gray to orange-tan, greenish-gray.|
|15.5 – 17.5||SAND, coarse, poorly sorted with gravel, some elongated pebbles to 8 mm.|
|17.5 – 31.2||Fine SAND with interbedded silty zones and thin, sandy clays, fining downward.
17.7–20.0, no sample.
22.0–23.5, no sample.
25.6–27.0, no sample.
30.2–31.0, no sample.
|31.2 – 45.0||Fine, coarse, and very coarse SAND with scattered quartz pebbles, some elongated, well rounded, up to 9 mm in dimension.|
|45.0 – 46.3||Amount of gravel, very coarse SAND increases, sediment is brown to orange and appears oxidized, sharp contact at 46.3 ft with limonite zone about 1 cm thick at contact.|
|46.3 – 60.0||Silty, sandy shell hash with some intact shells, medium gray to very light gray N6 – N8. Matrix is, in part, calcareous.|
|60.0 – 65.0||Greenish-gray, silty with some clay, a few shell fragments.|
|65.0 – 66.0||SAND, medium to fine, moderately well sorted, medium light gray, N6.|
|66.0 – 67.0||Silty CLAY, clay lenses, light olive-gray, 5Y5/2.|
|67.0 –67.3||Cemented sand/sandstone.|
|67.3 – 69.8||Very fine, fine SAND, yellowish-gray, 5Y4/2.|
|69.8 – 70.0||Cemented sand/sandstone.|
|70.0 – 75.3||Silty, clayey fine SAND, moderately olive-gray, 5Y4/2.|
|75.3 – 86.4||A few widely scattered shell fragments. Color becomes lighter below 75 – 75.3 ft, gradational change. Very fine, silty, clayey SAND; silt and clay 30–40% (est.), yellowish-gray, 5Y7/2.|
|86.4 – 90.5||Color darkens, light olive-gray, 5Y5/2. 86.4, silty, sandy CLAY; clay and silt >50% (est.).|
|90.5 – 91.4||Transition zone. Fine silt to clay, greenish olive-green, 5GY43/2 moderate sorting.|
|91.4 – 138.0||Shell hash, gray, fragment size well sorted from 1/16-inch to >2-inch pieces of high angular calcite crystal matrix.
105.0, shell and coral size increasing to >1 inch.
110.0, increase in % fine matrix, decrease in shell fragments.
111.0, shells (gastropods and bivalves, highly phosphatized increase in oysters and clay, deep green-black lagoonal fines.
117.0, gravel, phosphated to coarse sand, greenish-gray (5GY6/1, wet). Poorly graded, some angular pebbles (5%), some subrounded frosted quartz pebbles (5%), some ½-inch phosphatic polished, flat, wood fragments.
125.0, increasing sand, darker gray, less shell hash (5GY6/1), increased sandy matrix.
132.0, gravel in sandy matrix, greenish-gray (5GY6/1).
|138.0 – 145.0||Lagoonal deposit, very large oyster shells; shell limited by size of core barrel (up to 4 inches), blackish-green clay matrix 5GY3/2 (wet), very poorly sorted.|
|145.0 – 161.0||Oyster bed in green-gray sandy matrix with continuing phosphates. Very large oyster fragments.|
|161.0 – 170.0||LIMESTONE, unconsolidated, 0.1–0.4 shell fragments, sandy, light gray.|
|170.0 – 175.0||LIMESTONE, consolidated zone.|
|175.0 – 205.0||LIMESTONE, moldic moderately consolidated to well consolidated. Very high porosity, very high transmissivity.
180–186, yellow calcite crystals inside of bivalve mold; small, well-formed, angular crystals.
190–197, limestone, unconsolidated, moldic vuggy, shell molds ranging from 0.2 to 1.4 inches, pelecypod ridges are sharp and subangular.
|205.0 – 220.0||SAND, uniform, well sorted, 80%, small percent subrounded limestone and shell fragments. Sand, uniform, medium fine, small percent very fine.|
Figure 39. Selected borehole geophysical logs collected in Strat-9 test hole, U.S. Marine Corps Air Station, Cherry Point, North Carolina.
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