| Old Pump Road core |
| Depth (ft) |
Description |
|
Tamiami Formation (Ochopee Limestone Member) |
| 18.3 |
Molluscan wackestone with <5% silt to medium quartz sand in the micrite and microspar matrix; other skeletal grains include foraminifers (some leached), ostracodes, and echinoid fragments; some skeletal grains are phosphatized. The predominantly micritic matrix has been neomorphosed to a microspar and has a clotted texture in places; blocky calcite cement fills the voids and the porosity is very low. |
| 27.1 |
Molluscan packstone with 20 to 30% fine quartz sand in the micritic matrix; other skeletal grains include foraminifers (some leached), ostracodes, bryozoans, red algae, and echinoid fragments; most skeletal grains are micritized; the matrix has been neomorphosed to a microspar that has a clotted texture in places; geopetal structures; porosity is very low, some is moldic. |
| 39.2 |
Skeletal wackestone-packstone with <1% quartz silt in the micrite matrix (~25%); skeletal grains include micritized and leached aragonitic mollusks, calcitic mollusks, partially leached foraminifers, ostracodes, large bryozoan fragment, and echinoid fragments; nearly all skeletal grains are bored; porosity is highly variable due to patchy nature of micrite distribution. |
| 44.5 |
Skeletal packstone with trace amounts of silt-sized quartz in the micrite matrix (30%); skeletal grains include leached and infilled aragonitic mollusks, calcitic mollusks, partially leached foraminifers, rare ostracodes, bored echinoid fragments, and barnacles; porosity is low due to matrix and is predominantly moldic and intraparticle. |
| 47.6 |
Molluscan packstone with <5% very fine to fine quartz sand; other skeletal grains include foraminifers, ostracodes, and some partially leached echinoid fragments; some aragonitic molluscan fragments are unleached; evidence for an early, now leached cement between the echinoid fragment and the overgrowth; the matrix is a patchy microspar and some mollusks are now faint micrite envelopes within the microspar; porosity is primarily moldic. |
| 55.7 |
Molluscan packstone with <5% quartz silt and fine sand; other skeletal grains include foraminifers, ostracodes, echinoid fragments, and barnacles; micrite makes up about 15% of the matrix and there is evidence for an early, leached cement, perhaps aragonite; some aragonitic mollusks are unleached; porosity is primarily moldic and pore-lining cement is dogtooth calcite. |
| 56.4 |
Molluscan packstone with <5% quartz silt and fine sand in a micrite matrix (30%); other skeletal grains include foraminifers, ostracodes, bryozoans, and echinoid fragments; some aragonitic mollusks are unleached, mollusks are bored; evidence for a fibrous early cement on echinoid and mollusk grains; other cement is blocky and dogtooth calcite: blocky cement occurs inside large molluscan voids and dogtooth cement occurs along void surfaces; porosity is moldic and in vugs and channels. |
| 64.6 |
Molluscan wackestone-packstone with <5% fine quartz sand (and few fine sand phosphate grains) in the micrite matrix (15%); other skeletal grains include partially leached benthic and planktonic foraminifers, ostracodes, bryozoans, echinoid fragments with overgrowths, and barnacles; small amount of dogtooth calcite cement on planktonic foraminifers; porosity is moldic and in vugs and channels. |
| 67.4 |
Molluscan wackestone-packstone with <5% quartz silt and fine sand in a micrite matrix (20%); other skeletal grains include benthic and planktonic foraminifers, ostracodes, bryozoans, echinoids, and barnacles; dogtooth cement is similar to sample at 64.6, but less amount, porosity is moldic and in vugs and channels. |
| 74.7 |
Recrystallized wackestone, ~10% medium quartz sand in the microspar matrix (formerly micrite?); skeletal grains include molluscan molds and fragments, benthic foraminifers, bryozoans, echinoids; skeletal grains are recrystallized and difficult to identify; cement is blocky calcite on surfaces and in voids; and porosity is moldic and in vugs and channels. Compared to samples above, the quartz sand is far more abundant and coarser, and the cement is coarser and more abundant. |
| 86.0 |
Recrystallized wackestone, 20% medium quartz and <5% phosphatic sand in the micrite/microspar matrix (20%); skeletal grains include aragonitic mollusks and molds and calcitic mollusks, planktonic and benthic foraminifers, and echinoid fragments; skeletal grains are recrystallized and difficult to identify; cement is blocky calcite; porosity is moldic and in vugs and channels. |
| 89.7, 95.5 |
Recrystallized wackestone, 20% medium quartz and <5% phosphatic sand in the micrite/microspar matrix (15%); skeletal grains include aragonitic mollusks and molds and calcitic mollusks, benthic foraminifers, ostracodes, and echinoid fragments; skeletal grains in microspar matrix are recrystallized and difficult to identify; cement is blocky in the matrix and dogtooth calcite on void surfaces; porosity is high and is moldic and in vugs and channels. |
|
Unnamed formation |
| 174.8 |
Dolostone with 10% fine to medium quartz sand, and sparse dolomitized foraminifers; dolomite rhombs are primarily anhedral and about 30 µm and form the “matrix” of the rock, suggesting replacement of micrite; porosity is very low. |
| 175.2 |
Dolostone with 15% fine to medium quartz sand, and molluscan molds; similar to sample at 174.8 but more skeletal molds and scattered phosphatic clasts (hardground fragments?); porosity is moldic and in vugs and channels. |
| 176.6 |
Dolostone with 30% sand; skeletal grains include mollusk and foraminifer molds and a large red algae (partly calcareous) fragment that covers about half of the thin section, Halimeda; matrix is dolomicrite (30%) and dolospar rhombs (50 µm) line voids; geopetal structures. |
| 176.8 |
Dolostone, very similar to 174.8, above. |
| 180.9 |
Sandy dolostone, with 30% medium quartz sand, calcareous mollusks, ostracodes, bryozoans and red algae; muddy peloidal clasts are partly calcareous and hold skeletal grains; matrix is primarily dolomicrite; dolomite rhombs in voids are ~50 µm, and primarily euhedral; desiccation(?) cracks. |
| 184.0 |
Molluscan wackestone with ~20% medium quartz sand; skeletal grains include molluscan molds and fragments, foraminifers, ostracodes, and echinoid fragments with syntaxial overgrowths; micrite matrix is about 40%; porosity is high due to large connected molluscan molds; blocky calcite cement covers void surfaces. |
| 186.1 |
Pisoidal wackestone with sparse skeletal grains and 10% medium quartz sand; skeletal grains include partially leached mollusks and benthic foraminifers, and barnacles; minor sparry calcite on void surfaces; porosity is moldic, in vugs and channels, and interparticle. |
| 188.1 |
Pisoidal molluscan wackestone with 15% medium quartz sand; skeletal grains include bored, partially leached mollusks and coral fragments; porosity is high in molds, vugs and channels; micrite matrix (15%) is peloidal. |
| 189.1 |
Pisoidal molluscan grainstone, with <5% fine quartz sand, and 30% micrite as a grain coating; skeletal grains include partially leached mollusks and coral; porosity is high and is interparticle, moldic, in vugs and channels. |
| 190.9 |
Pisoidal wackestone with 10% quartz silt to medium sand; skeletal grains include molluscan molds and bored fragments, phosphatized benthic foraminifers, ostracodes, echinoids and coral fragments; pisoids fill some voids; porosity is interparticle, moldic, in vugs and channels; micrite matrix (15%). |
| 195.2 |
Molluscan wackestone-packstone with 20% medium quartz sand, and 30% peloidal micrite matrix; skeletal grains include well preserved calcitic and aragonitic mollusks, benthic foraminifers, and ostracodes; very little surface cement. |
