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publications > open file report > OFR 98-205 > appendix 1 > fakahatchee strand-ranger station core
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Appendix 1
Petrographic Descriptions (all percentages are visual estimates)
| Fakahatchee Strand-Ranger Station core |
| Depth (ft) |
Description |
|
Tamiami Formation (Ochopee Limestone Member) |
| 8.3 |
Molluscan packstone with <10% very fine quartz sand in a micrite matrix (40%); skeletal grains include leached mollusks with micrite envelopes and molluscan fragments, benthic foraminifers, bryozoans, echinoids; minor amount of grain-coating chalcedony in voids; blocky calcite cement in voids; evidence for an early leached fibrous cement, porosity is moldic. |
| 10.7 |
Skeletal packstone with <5% very fine quartz sand, and 20% micrite matrix; skeletal grains include micritized molluscan fragments, benthic foraminifers, ostracodes, bryozoans, echinoids, and barnacles; geopetal structures; blocky void-filling calcite cement, evidence for an early fibrous leached cement; porosity is interparticle and moldic. |
| 12.7 |
Molluscan packstone with <3% quartz silt and microspar matrix; skeletal grains include partially leached mollusks, benthic foraminifers, echinoids, and barnacles; minor micrite matrix; porosity is interparticle and moldic; geopetal structures. |
| 17.6 |
Molluscan grainstone with <3% quartz silt and fine sand and <5% micrite matrix; skeletal grains include molluscan fragments (bores) and molds, partially leached benthic foraminifers, echinoids and barnacles; evidence for an early fibrous leached cement on echinoids; isopachous blocky cement on all surfaces, some dogtooth cement, high porosity as interparticle, intraparticle, and moldic. |
| 22.7 |
Molluscan grainstone with <1% quartz and phosphatic silt to fine sand in a sparse micrite matrix (10%) with microspar and blocky calcite void-filling cement; skeletal grains include molluscan molds and fragments, foraminifers, bryozoans, partially leached echinoids, and barnacles; geopetal structures; evidence of an early leached cement; porosity is moldic. |
| 34.0 |
Molluscan packstone with <3% quartz and phosphatic silt and fine sand in a micrite matrix (10%); skeletal grains include molluscan molds and fragments, benthic and planktonic foraminifers, bryozoans, red algae, and barnacles; very porous with interparticle, intraparticle, and moldic porosity; cement is sparse and finely crystalline dogtooth calcite (16-62 µm). |
| 51.5 |
Molluscan wackestone to packstone with 10% quartz silt and <1% phosphatic silt and fine sand in a micrite matrix (15%); skeletal grains include molluscan molds (some original aragonite present) and fragments, partially leached benthic foraminifers, ostracodes, bryozoans, partially leached echinoids, and barnacles; sample dominated by bored oyster fragment; cement is finely crystalline dogtooth calcite (16-62 µm); porosity is moldic. |
| 53.8 |
Molluscan wackestone to packstone with 20% quartz fine to medium sand and <1% phosphatic fine sand in a micrite matrix (30%); skeletal grains include molluscan molds and fragments, benthic and planktonic foraminifers, bryozoans, echinoids and barnacles; matrix is neomorphosed to microspar and has a clotted texture in places; porosity is moldic and in vugs and channels. |
| 61.5 |
Calcareous sandstone with 40% medium quartz sand, and sand-free, pisolitic mudstone to wackestone with microspar and clotted texture; no skeletal grains; extremely low porosity. |
|
Unnamed formation |
| 139.8 |
Dolostone with <5% medium quartz sand; skeletal grains include mollusks molds, and other nondescript molds and vugs; all matrix is dolomicrite and very finely crystalline, no additional cement precipitation after leaching of skeletal grains; dolomite rhombs are 15 µm, are euhedral and uniform, and form about 80% of the sample. |
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