CORE 3A
    :
    Core 3A was taken at water depth of 4.7m (15.5ft) (Table 1) and had a total length of 262cm (103in)
    (Figures1-4). A total of 13 grain size samples were taken at depths of 1-10cm (0.4-3.9in), 31-40cm
    (12.2-15.8in), 71- 80cm (28-31.5in), 81-90cm (31.9-35.4in), 101-110cm (39.8-43.3in), 111-120
    (43.7-47.2in), 141-150cm (55.5-59.1in), 171-180cm (67.3-70.9in), 191-200cm (75.2-78.7in),
    201-210cm (79.1-82.7in), 211-220cm (83-86.6in), 231-240cm (90.9-94.5in), and 251-260cm
    (98.8-102.4in). The grain size analysis revealed that the upper 70cm (27.6in) ranged from 93 to 86%
    sand and had a mean grain size ranging from 0.1096mm (3.18phi) to 0.1294mm (2.95phi). At the
    depths of 71cm (28in) to 90cm (35.4in) there is a decrease in sand percentages from 86 to 67% and
    an increase in mean grain size from 0.1181mm (3.1phi) to 0.174mm (2.5phi). From 90cm (35.4in) to
    200cm (78.7in) percent sand remained above 81% and had a mean grain size that ranged from
    0.174mm (2.5phi) to 0.098mm (3.3phi). From depths of 200cm (78.7in) to 240cm (94.5in) there is a
    decrease in the percent sand ranging from 90% to 47% with a mean grain size ranging from
    0.0939mm (3.4phi) to 0.2694mm (1.9phi) From 231cm (90.9in) to the bottom of the core, percent
    sand increased from 47% to 88% sand and from had a mean grain size that decreased from
    0.2694mm (1.9phi) to 0.1456mm (2.8phi).
    Sand and shell weights are shown in Table 2. Percent shell, sand, silt and clay are shown in Table
    3. Median grain size, mean grain size, skewness and sorting index are shown in Table 6. Graphs
    of the results are located in Figures 5-8.
    It was determined that core 3A had approximately 260cm (102.4in) of sediment that contained at
    least 50% sand, of which 100cm (39.4in) was located at less than 1m (3.28ft) depth.
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    18
    0m
    0.5m
    1.0m
    1.5m
    2.0m
    2.5m
    3A
    0m
    .50m
    1.0m
    1.5m
    0m
    0.5m
    1.0m
    1.5m
    2.0m
    2.5m
    3B
    3C
    Figure 1: Core photographs for Line 3
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    19
    Figure 2: Core log for 3A fore depths 0-150cm
    Figure 3: Core log for 3A for depths 150-262cm
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    Figure 4: Computer Core Log for 3A
    21
    Core ID
    Sample Depth (cm)
    shell weight (g)
    200+ weight (g)
    200-230 weight (g)
    overall sand weight (g)
    3A
    1-10
    4.37
    101.41
    1.65
    101.41
    3A
    31-40
    1.35
    100.58
    1.34
    100.58
    3A
    71-80
    5.75
    88.11
    1.90
    88.11
    3A
    81-90
    27.80
    82.74
    8.26
    82.74
    3A
    101-110
    13.23
    81.81
    1.66
    81.81
    3A
    111-120
    0.97
    76.56
    4.89
    76.56
    3A
    141-150
    0.88
    86.39
    4.26
    86.39
    3A
    171-180
    2.08
    81.15
    5.24
    81.15
    3A
    191-200
    3.43
    104.64
    2.08
    104.64
    3A
    201-210
    2.27
    76.09
    3.56
    76.09
    3A
    211-220
    3.12
    75.14
    5.39
    75.14
    3A
    231-240
    52.80
    61.40
    1.99
    61.40
    3A
    251-260
    5.11
    72.81
    0.45
    72.81
    Table 2: Shell and Sand Weights for core 3A
    Core ID
    Sample Depth (cm)
    % shell
    % sand
    %silt
    %clay
    3A
    1-10
    3.89
    90.29
    3.02
    2.80
    3A
    31-40
    1.25
    93.19
    2.50
    3.05
    3A
    71-80
    5.67
    86.93
    4.39
    3.00
    3A
    81-90
    22.62
    67.32
    7.76
    2.29
    3A
    101-110
    13.03
    80.57
    3.67
    2.73
    3A
    111-120
    1.04
    81.76
    13.76
    3.44
    3A
    141-150
    0.88
    86.04
    9.02
    4.06
    3A
    171-180
    2.16
    84.30
    10.04
    3.50
    3A
    191-200
    2.94
    89.83
    3.90
    3.33
    3A
    201-210
    2.52
    84.31
    9.17
    4.00
    3A
    211-220
    3.22
    77.51
    13.72
    5.55
    3A
    231-240
    40.75
    47.39
    7.52
    4.35
    3A
    251-260
    6.16
    87.82
    2.58
    3.43
    Table 3: Percent Shell, Sand, Silt and Clay for core 3A
    22
    Core ID
    Sample
    Depth
    (cm)
    N10/
    2.0mm
    Screen
    Sample
    Weight
    (g)
    N14/
    1.40mm
    Screen
    Sample
    Weight
    (g)
    N18/
    1.00mm
    Screen
    Sample
    Weight
    (g)
    N25/
    710μm
    Screen
    Sample
    Weight
    (g)
    N35/
    500μm
    Screen
    Sample
    Weight
    (g)
    N45/
    355μm
    Screen
    Sample
    Weight
    (g)
    N60/
    250μm
    Screen
    Sample
    Weight
    (g)
    N80/
    180μm
    Screen
    Sample
    Weight
    (g)
    N125/
    125μm
    Screen
    Sample
    Weight
    (g)
    N170/
    90μm
    Screen
    Sample
    Weight
    (g)
    N200/
    75μm
    Screen
    Sample
    Weight
    (g)
    N230/
    63μm
    Screen
    Sample
    Weight
    (g)
    CATCH
    Pan
    3A
    1-10
    1.07
    1.03
    0.79
    0.62
    0.46
    0.40
    0.42
    0.87
    62.74
    33.89
    3.49
    1.65
    0.51
    3A
    31-40
    0.08
    0.27
    0.28
    0.23
    0.19
    0.30
    0.38
    1.25
    26.21
    62.30
    10.44
    1.34
    0.38
    3A
    71-80
    1.65
    1.30
    1.04
    0.86
    0.56
    0.34
    0.67
    1.72
    33.35
    46.39
    5.98
    1.90
    0.50
    3A
    81-90
    4.98
    2.47
    1.88
    1.54
    0.97
    15.96
    0.93
    2.96
    38.67
    37.08
    3.10
    8.26
    0.21
    3A
    101-110
    4.25
    3.11
    1.97
    1.70
    1.15
    1.05
    1.07
    4.75
    40.31
    31.60
    4.08
    1.66
    0.57
    3A
    111-120
    0.08
    0.23
    0.18
    0.21
    0.15
    0.12
    0.25
    0.88
    16.76
    52.27
    6.40
    4.89
    3.89
    3A
    141-150
    0.21
    0.19
    0.11
    0.13
    0.10
    0.14
    0.22
    0.74
    14.60
    57.63
    13.20
    4.26
    1.65
    3A
    171-180
    0.96
    0.41
    0.24
    0.21
    0.14
    0.12
    0.24
    0.58
    12.63
    57.06
    10.64
    5.24
    1.89
    3A
    191-200
    0.96
    0.76
    0.66
    0.48
    0.30
    0.27
    0.29
    1.02
    33.55
    61.88
    7.90
    2.08
    0.61
    3A
    201-210
    0.68
    0.62
    0.37
    0.30
    0.18
    0.12
    0.20
    0.57
    11.59
    56.54
    7.19
    3.56
    1.31
    3A
    211-220
    1.01
    0.59
    0.55
    0.48
    0.30
    0.19
    0.32
    0.78
    9.63
    55.13
    9.28
    5.39
    2.79
    3A
    231-240
    12.05
    10.66
    9.68
    9.57
    6.62
    4.22
    1.91
    2.42
    19.24
    33.07
    4.76
    1.99
    0.77
    3A
    251-260
    1.71
    0.94
    0.77
    0.76
    0.54
    0.39
    0.69
    3.86
    59.02
    7.97
    1.27
    0.45
    0.10
    Table 4: RO-TAP data for core 3A
    23
    ASTM
    Classification
    coarse
    sand
    medium
    sand
    medium
    sand
    medium
    sand
    medium
    sand
    fine sand
    fine
    sand
    fine
    sand
    fine sand
    fine sand
    fine
    sand
    silt
    Wentworth
    Classification
    granule
    very
    coarse
    sand
    very
    coarse
    sand
    coarse
    sand
    coarse
    sand
    medium
    sand
    fine
    sand
    fine
    sand
    fine sand
    very fine
    sand
    very fine
    sand
    very
    fine
    silt
    Core ID
    Sample
    Depth
    (cm)
    % finer
    than
    N10/
    2.0mm/
    -1.0Φ
    Screen
    % finer
    than
    N14/
    1.40mm
    / -0.5Φ
    Screen
    % finer
    than
    N18/
    1.00mm/
    0.0Φ
    Screen
    % finer
    than
    N25/
    710μm
    / 0.5Φ
    Screen
    % finer
    than
    N35/
    500μm/
    1.0Φ
    Screen
    % finer
    than
    N45/
    355μm /
    1.5Φ
    Screen
    % finer
    than
    N60/
    250μm
    2.0Φ
    Screen
    % finer
    than
    N80/
    180μm/
    2.5 Φ
    Screen
    % finer
    than
    N125/
    125μm/
    3.0Φ
    Screen
    % finer
    than
    N170/
    90μm /
    3.5Φ
    Screen
    % finer
    than
    N200/
    75μm /
    4.0Φ
    Screen
    %
    finer
    than
    4μm/
    8Φ
    Observed
    Contents of
    the sample
    shell
    only
    shell
    only
    shell
    only
    shell
    only
    shell
    only
    shell
    only
    shell
    only
    sand
    sand
    sand
    sand
    silt
    3A
    1-10
    99.0
    98.1
    97.4
    96.9
    96.5
    96.1
    95.7
    95.0
    39.1
    8.9
    5.8
    2.8
    3A
    31-40
    99.9
    99.7
    99.4
    99.2
    99.0
    98.7
    98.4
    97.2
    73.0
    15.2
    5.6
    3.1
    3A
    71-80
    98.4
    97.1
    96.1
    95.2
    94.7
    94.3
    93.7
    92.0
    59.1
    13.3
    7.4
    3.0
    3A
    81-90
    95.9
    93.9
    92.4
    91.2
    90.4
    77.4
    76.6
    74.2
    42.8
    12.6
    10.1
    2.3
    3A
    101-110
    95.8
    92.8
    90.8
    89.1
    88.0
    87.0
    85.9
    81.2
    41.5
    10.4
    6.4
    2.7
    3A
    111-120
    99.9
    99.7
    99.5
    99.3
    99.1
    99.0
    98.7
    97.8
    79.9
    24.0
    17.2
    3.4
    3A
    141-150
    99.8
    99.6
    99.5
    99.4
    99.3
    99.1
    98.9
    98.2
    83.6
    26.2
    13.1
    4.1
    3A
    171-180
    99.0
    98.6
    98.3
    98.1
    98.0
    97.8
    97.6
    97.0
    83.9
    24.6
    13.5
    3.5
    3A
    191-200
    99.2
    98.5
    98.0
    97.5
    97.3
    97.1
    96.8
    95.9
    67.1
    14.0
    7.2
    3.3
    3A
    201-210
    99.2
    98.6
    98.1
    97.8
    97.6
    97.5
    97.3
    96.6
    83.8
    21.1
    13.2
    4.0
    3A
    211-220
    99.0
    98.3
    97.8
    97.3
    97.0
    96.8
    96.5
    95.6
    85.7
    28.8
    19.3
    5.5
    3A
    231-240
    90.7
    82.5
    75.0