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publications > open file report > OFR 98-205 > appendix 1 > picayune strand state forest core
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Appendix 1
Petrographic Descriptions (all percentages are visual estimates)
| Picayune Strand State Forest core |
| Depth (ft) |
Description |
|
Tamiami Formation (Ochopee Limestone Member) |
| 9.0 |
Molluscan packstone with 10% quartz silt and trace of phosphatic silt in a micrite matrix (15%); skeletal grains include molluscan molds (infilled with blocky calcite cement), benthic foraminifers, ostracodes, and echinoid fragments; some matrix is neomorphosed to microspar and has a clotted texture; porosity is moldic and in vugs and channels. |
| 11.8 |
Molluscan packstone with trace of quartz silt in a micrite matrix (15%) neomorphosed to microspar with a clotted texture; skeletal grains include molluscan molds (infilled with blocky calcite cement) and fragments, foraminifers (?), bryozoans, and echinoid fragments; blocky calcite cement fills in nearly all moldic porosity; very low porosity. |
| 31.3 |
Molluscan wackestone to packstone with a trace of quartz silt in a micrite matrix (30%); skeletal grains include molluscan molds and fragments, benthic foraminifers, ostracodes, bryozoans, echinoid fragments, and barnacles; minor dogtooth calcite spar on skeletal fragments; porosity is moldic. |
| 41.0 |
Molluscan packstone to grainstone with a trace of quartz silt in a micrite matrix (25%); skeletal grains include molluscan molds and fragments, benthic foraminifers, ostracodes, partially leached bryozoans, echinoid fragments, and barnacles; virtually no void-filling cement; porosity is primarily moldic. |
| 53.0 |
Molluscan wackestone to packstone with trace of quartz silt in a micrite matrix (40%); skeletal grains include molluscan molds and fragments, partially leached benthic foraminifers, bryozoans, echinoids, and barnacles; minor amount of dogtooth calcite spar on skeletal surfaces; porosity is moldic and in vugs and channels. |
| 75.0 |
Sandy molluscan packstone with 20% medium quartz sand in a micrite matrix (40%); skeletal grains include molluscan molds and fragments, benthic foraminifers, ostracodes, red algae, and partially leached echinoids; isopachous layer of dogtooth calcite on most surfaces; porosity is moldic and in vugs and channels. |
| 85.2 |
Calcareous sandstone with 50% medium quartz sand and <10% micrite matrix adhering to grains as meniscus cement; skeletal grains include molluscan molds and fragments, partially leached benthic foraminifers, bryozoans, and barnacles; dogtooth spar grows on micrite matrix/cement; high interparticle porosity with minor moldic porosity. |
|
Unnamed formation |
| 169.2 |
Dolostone with <5% fine quartz sand, in a dolomicrite matrix (10%); skeletal grains are rare molluscan molds, bryozoans, echinoid fragments, and barnacles; dolomite rhombs are both euhedral and anhedral and 30-50 µm; porosity is interparticle and moldic. |
| 181.3 |
Dolostone with rare molluscan molds, and a peloidal dolomicrite matrix (30%), and dolomite rhombs (euhedral and anhedral) (30 µm) on void surfaces; coral molds; pyrite framboids (10-20 µm) occur in dolomicrite. |
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