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core 3AS3-GW-2
Appendices
Appendix II - Core Descriptions and Graphic Summaries
Core 3AS3-GW-2
| 0-5.00' |
Peat and Organic Sediment (not described). |
| 5.00-5.50' |
Calcrete and Intraclast Floatstone, laminated calcrete with soil breccia related to subaerial exposure processes. Well cemented. Interparticle and microporosity(?) at <10%, low effective porosity
10YR 8/2 very pale brown. |
| 5.50-7.00' |
Lime Packstone with intervals of laminated calcrete. Packstone intervals are skeletal sand with minor amount of lime mud. Skeletal allochems are mainly bivalve fragments, but contain possible root-altered fabric. Laminated calcrete at ~6.2' and 6.8'. Porosity is ~15% in the skeletal packstone intervals. Overall, moderate effective porosity.
2.5Y 8/2 pale yellow (light tan). |
| 7.00-8.00' |
No recovery, core normalized to top of run. Base of core run at 8.0'. |
| 8.00-8.80' |
Grainstone, medium- to coarse-skeletal sand with calcrete intraclasts (from underlying unit?). Skeletal allochems include bivalves and benthic foraminifers. Moderate-well cemented. Porosity is interparticle at ~15-20%. Moderate to high effective porosity.
2.5Y 8/2 pale yellow. |
| 8.80' |
Sharp contact, erosional, likely related to subaerial exposure. |
| 8.80-11.00' |
Intraclast Floatstone (soil breccia), mixed quartz sand, lime mud, large (0.5-1.5 cm) intraclasts and large oyster fragments. Some of the intraclasts may be of quartz sandstone composition. Porosity is mostly interparticle (5-10%), effective porosity is moderate.
2.5Y 7/1 light gray. |
| 11.00-12.00' |
No recovery, core normalized to top of run. Base of core run at 12.0'. |
| 12.00-34.0' |
Quartz-sand mixed with carbonate sand and shell fragments (not described). |
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