publications > water resources investigations > report 00-4251 > appendix i > st. hugh's school core

St. Hugh's School Core

Depth (feet below land surface)	Lithologic description
0.0 - 2.0	Asphalt, loose quartz sand and Holocene roots, medium-dark-gray N4 to black N1; mainly silt to medium grain size, ranges from silt to coarse; 90 percent fine to coarse quartz sand; 5 to 20 percent interparticle porosity; very low to moderate hydraulic conductivity.
2.0 - 4.0	Loose quartz sand, grayish-orange 10YR 7/4; mainly silt to medium grain size, ranges from silt to medium; 95 percent fine to medium quartz sand; 25 percent interparticle porosity; high hydraulic conductivity; iron-oxide coating on quartz grains.
4.0 -5.0	Loose quartz sand with clasts of limestone; medium-light-gray N6; mainly silt to fine grain size, ranges from clay to medium; 95 percent fine to medium quartz sand, 5 percent limestone clasts; 20 percent interparticle porosity; high hydraulic conductivity.
5.0 - 6.0	Friable quartz sand, dark-yellowish-orange 10YR 6/6; mainly fine to medium grain size; ranges from fine to medium; 95 percent quartz sand; iron-oxide coating on quartz grains; 20 percent interparticle porosity; moderate hydraulic conductivity.
6.0 - 6.5	Friable quartz sand; dark-yellowish-brown 10YR 6/6 and very pale orange 10YR 8/2; mainly clay to fine-grained quartz, ranges from clay to medium; 80 percent fine to medium quartz sand, 10 percent clay, 10 percent clasts of oolitic lime grainstone; 5 percent interparticale porosity; low hydraulic conductivity.
6.5 - 7.5	Highly burrowed oolitic lime grainstone; very pale orange 10YR 8/2; mainly medium grain size, ranges from medium to pebble; mollusks; 20 percent interparticle and vuggy porosity; high hydraulic conductivity.
7.5 - 12.5	Highly burrowed oolitic lime grainstone, very pale orange 10YR 8/2; mainly medium grain size, ranges from medium to pebble; skeletal fragments and mollusks; 30 percent oomoldic, interparticle, vuggy and solution-channel porosity; very high hydraulic conductivity.
12.5 - 13.5	Rubble of highly burrowed oolitic lime grainstone, very pale orange 10YR 8/2; mainly medium grain size, ranges from medium to pebble; skeletal fragments and mollusks; 30 percent oomoldic, interparticle, vuggy and solution-channel porosity; very high hydraulic conductivity.
13.5 - 16.0	No recovery.
16.0 - 19.0	Highly burrowed oolitic lime grainstone with minor oolitic packstone, very pale orange 10YR 8/2; mainly medium grain size, ranges from clay to pebble; mollusks and bryozoans; 30 percent oomoldic, vuggy and interparticle porosity; very high hydraulic conductivity.
19.0 - 21.0	No recovery.
21.0 - 23.0	Burrowed oolitic lime grainstone, very pale orange 10YR 8/2; mainly medium grain size, ranges from fine to pebble; 10 percent fine- to medium-grained quartz sand, mollusks; 20 percent oomoldic, vuggy and interparticle porosity; high hydraulic conductivity.
23.0 - 26.0	No recovery.
26.0 - 27.0	Rubble of oolitic lime grainstone, very pale orange 10YR 8/2; mainly medium grain size, ranges from fine to pebble; 15 percent fine- to medium-grained quartz sand, mollusks; 25 percent oomoldic, interparticle and vuggy porosity; high hydraulic conductivity.
27.0 - 31.7	No recovery.
31.7 - 32.0	Rubble of oolitic lime grainstone, very pale orange 10YR 8/2; mainly medium grain size, ranges from fine to pebble; 15 percent fine- to medium-grained quartz sand, skeletal fragments; 25 percent oomoldic, interparticle and vuggy porosity; high hydraulic conductivity.
32.0 - 33.0	Mollusk fragment lime floatstone with quartz sand-rich lime packstone matrix, mottled dark-yellowish-orange 10YR 6/6, grayish-orange 10YR 7/4, pale-yellowish-brown 10YR 6/2 to very pale orange 10YR 8/2; mainly clay and fine to medium grain size, ranges from clay to pebble; 20 percent fine- to medium-grained quartz sand, skeletal fragments and mollusks; abundant root molds, subaerial exposure zone; 25 percent interparticle, vuggy, root-mold and solution-channel porosity; very high hydraulic conductivity.
33.0 - 35.0	Monastrea lime framestone, very pale orange 10YR 8/2; mainly cobble to boulder grain size, ranges from cobble to boulder; 30 percent intraparticle porosity; very high hydraulic conductivity.
35.0 - 41.0	No recovery.
41.0 - 44.0	Monastrea lime framestone, very pale orange 10YR 8/2; mainly cobble to boulder grain size, ranges from cobble to boulder; 30 percent intraparticle porosity; very high hydraulic conductivity.
44.0 - 46.0	Skeletal-fragment lime floatstone with peloid lime packstone matrix, very pale orange 10YR 8/2; mainly clay, silt and pebble grain size, ranges from clay to pebble; mollusks and coral fragments; 30 percent vuggy and solution-channel porosity; very high hydraulic conductivity; very "rotten" vuggy texture, possible exposure surface at 44 feet.
46.0 - 48.0	No recovery.
48.0 - 48.5	Skeletal-fragment lime grainstone, very pale orange 10YR 8/2; mainly very fine to granule grain size, ranges from very fine to pebble; mollusks, gastropods and benthic foraminifers; 30 percent moldic and vuggy porosity; very high hydraulic conductivity; verry "rotten" vuggy texture.
48.5 - 49.0	Skeletal-fragment-rich quartz sandstone; very pale orange 10YR 8/2; mainly very fine to fine grain size, ranges from very fine to granule; 40 percent very fine to fine quartz sand; 25 percent vuggy and interparticle porosity; high hydraulic conductivity.
49.0 - 50.0	Skeletal fragment lime floatstone with matrix of skeletal fragment quartz sand-rich lime packstone, very pale orange 10YR 8/2; mainly very fine to fine and pebble grain size, ranges from very fine to pebble; 40 percent very fine to fine quartz sand; mollusks, gastropods and sand dollars; 25 percent vuggy and interparticle porosity; high hydraulic conductivity.
50.0 - 55.0	No recovery.
55.0 - 55.5	Rubble of skeletal-fragment lime floatstone with quartz sand-rich lime grainstone matrix, very pale orange 10YR 8/2; mainly very fine to pebble grain size, ranges from very fine to pebble; 20 percent very fine quartz sand; 30 percent vuggy and interparticle porosity; high hydraulic conductivity; root molds, very "rotten" vuggy texture.
55.5 - 56.3	Moldic skeletal fragment lime floatstone with matrix of skeletal fragment lime packstone; very pale orange 10YR 8/2; mainly clay to pebble grain size, ranges from clay to pebble; mollusks; 30 percent moldic and solution-channel porosity; very high hydraulic conductivity.
56.3 - 58.7	Moldic skeletal fragment lime floatstone with matrix of skeletal fragment lime wackestone; very pale orange 10YR 8/2 to grayish orange 10YR 7/4; mainly clay to medium grain size, ranges from clay to pebble; mollusks and sponges(?); 30 percent moldic and solution-channel porosity; very high hydraulic conductivity.
58.7 - 61.0	No recovery.
61.0 - 62.5	Rubble of skeletal-fragment lime packstone, very pale orange 10YR 8/2; mainly clay to medium grain size, ranges from clay to pebble; 5 percent very fine to medium quartz sand, mollusks and miliolids; vuggy, moldic and solution-channel porosity; high hydraulic conductivity; root molds.
62.5 - 68.0	No recovery.
68.0 - 69.5	Rubble of skeletal, quartz-sand-rich lime packstone and grainstone, very pale orange 10YR 8/2; mainly clay to granule grain size, ranges from clay to pebble; 20 to 40 percent very fine to fine quartz sand, miliolids and mollusks; 25 percent vuggy and moldic porosity; high hydraulic conductivity; root molds.
69.5 - 75.0	No recovery.
75.0 - 75.5	Rubble of skeletal fragment, quartz sand-rich lime packstone and wackestone; very pale orange 10YR 8/2; mainly very fine to fine grain size, ranges from clay to coarse; 30 percent fine quartz sand; 25 percent moldic and vuggy porosity; high hydraulic conductivity; solution channels filled with very fine to fine quartz sand.
75.5 - 77.4	Monastrea lime framestone, very pale orange 10YR 8/2; mainly cobble to boulder grain size, ranges from cobble to boulder; 25 percent moldic and vuggy porosity; very high hydraulic conductivity.
77.4 - 78.3	Skeletal fragment lime floatstone with matrix of skeletal fragment lime wackestone, very pale orange 10YR 8/2 to grayish orange 10YR 7/4; mainly clay to coarse, ranges from clay to pebble; mollusks and branching corals; 20 percent vuggy and moldic porosity; high hydraulic conductivity.
78.3 - 80.0	Skeletal fragment lime wackestone, very pale orange 10YR 8/2 to grayish orange 10YR 7/4; mainly clay to coarse grain size, ranges from clay to coarse; mollusks and gastropods; 20 percent vuggy and moldic porosity; high hydraulic conductivity; one 5-millimeter-thick lamination of very fine quartz sand.
80.0 - 81.0	No recovery.
81.0 - 84.8	Mollusk and branching-coral lime floatstone with matrix of skeletal fragment, peloid lime wackestone, very pale orange 10YR 8/2 to grayish orange 10YR 7/4; mainly clay to coarse grain size, ranges from clay to pebble; 20 percent moldic porosity, vuggy and solution-channel porosity; high hydraulic conductivity; root molds.
84.8 - 89.0	Skeletal fragment, quartz-sand-rich lime grainstone; mottled very pale orange 10YR 8/2 and grayish orange 10YR 7/4; mainly very fine to coarse grain size; ranges from very fine to pebble; 20 percent very fine to medium quartz sand, red algae, mollusks, gastropods and branching corals; 20 percent interparticle and moldic porosity, moderate hydraulic conductivity.
89.0 - 92.8	Skeletal-fragment lime floatstone with matrix of skeletal fragment, quartz-sand-rich lime grainstone, mottled very pale orange 10YR 8/2, grayish orange 10YR 7/4 to very light gray N8; mainly very fine to pebble grain size, ranges from very fine to pebble; 10 to 20 percent very fine to medium quartz sand, red algae, gastropods and mollusks; 20 percent interparticle and moldic porosity; moderate hydraulic conductivity.
92.8 - 95.0	No recovery.
95.0 - 97.0	Quartz-sand-rich, skeletal lime grainstone, very light gray N8; mainly very fine to coarse grain size, ranges from very fine to pebble; 20 percent very fine to fine quartz sand, mollusks and gastropods; 20 percent moldic, interparticle and vuggy porosity; moderate hydraulic conductivity.
97.0 - 101.0	No recovery.

U.S. Department of the Interior, U.S. Geological Survey
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Last updated: 20 January, 2005 @ 01:23 PM (KP)