| Collier-Seminole State Park core |
| Depth (ft) |
Description |
|
Undifferentiated, unconsolidated quartz sand |
| 9.3 |
Medium quartz sand (scattered coarse grains) with organic-rich clay coatings (10%); noncarbonate. |
| 13.8 |
Same as above but with a few molluscan molds. Tamiami Formation (Ochopee Limestone Member) |
| 24.0 |
Molluscan packstone with 1-3% fine quartz sand and silt in a matrix of microspar and a small amount of micrite; evidence for an early leached isopachous bladed cement; skeletal grains include mollusks, bryozoans, and partially leached echinoids, most skeletal grains are bored; intergranular blocky calcite overlies early leached cement; porosity is inter- and intraparticle, moldic, and shelter. |
| 27.7 |
Molluscan wackestone-packstone; similar to sample at 24 ft, but less skeletal and cement leaching, more tightly cemented with more matrix micrite; 3-5% fine quartz sand in micrite matrix 20%, early leached cement overlain by later blocky isopachous (in voids) and pore-filling cement; skeletal grains include mollusks molds and fragments, ostracodes, partially leached foraminifers, bryozoans, partially leached echinoids; porosity is primarily intraparticle and moldic, with minor shelter; nearly all interparticle space is filled with matrix or cement. |
| 29.3 |
Echinoid wackestone with <1% quartz and phosphate silt and about 30% micrite matrix with a small amount of microspar; large echinoid fragment dominates thin section with calcite mud-supported grains on either side; skeletal grains include mollusks, benthic foraminifers, ostracodes, bryozoans, and echinoids; an early cement was leached; an isopachous dogtooth calcite cement in voids is overlain in places by an intergranular blocky calcite cement; >30% porosity is intraparticle and moldic. |
| 38.3 |
Molluscan wackestone-packstone with 1-3% fine quartz sand and silt, well-cemented with carbonate mud matrix (30%) with benthic foraminifer, mollusk, barnacle, ostracode, and echinoid (partially leached) fragments; dogtooth spar in voids; syntaxial overgrowths on echinoid fragments; porosity is interparticle, intraparticle and moldic. |
| 47.0 |
Molluscan packstone with <5% medium quartz and phosphatic sand and possible neomorphism of micrite matrix; bored skeletal grains include benthic foraminifer, echinoid, and molluscan fragments; blocky calcite cement on grain surfaces, very high inter- and intraparticle, vuggy, and moldic porosity (>30%); blocky calcite cement on surfaces and syntaxial overgrowths on echinoids; possible pendant cements under foraminifers. |
| 50.0 |
Molluscan wackestone-packstone with 5% fine quartz and phosphatic sand and silt with clotted texture in micrite matrix (neomorphic spar?); skeletal grains include bored mollusks (partially leached aragonitic and calcitic), partially leached echinoid fragments, partially leached benthic foraminifers, and ostracodes, blocky calcite on surfaces; low porosity (<3%) with minor interparticle and moldic pore space. |
| 52.5 |
Molluscan packstone with 5% fine quartz and phosphatic sand and silt, with a clotted texture in micrite matrix (neomorphic spar), skeletal grains include bored mollusk (partially leached aragonitic and calcitic) shells, partially leached echinoid fragments, foraminifers (partially leached), ostracodes; blocky calcite on skeletal surfaces; low porosity (<3%) with minor interparticle and moldic pore space. Grain leaching occurred after precipitation of overgrowth cement on echinoids. |
| 54.9 |
Very sandy bryozoan packstone to calcareous sandstone, 40% medium to coarse quartz sand with <1% feldspar grains; matrix may have originally been micrite but now all sparry calcite; isopachous blocky cement on grains; skeletal grains include micritized molluscan molds, partially leached bryozoans, foraminifers, ostracodes, and echinoids; cement growth continued after leaching with cement on inside and outside of micrite envelopes; geopetal structures in bryozoan cavities. |
| 55.6 |
Same as above, with molluscan fragments, 20% medium quartz sand in a microspar matrix; blocky to dogtooth void-filling cements, few foraminifers, and partially leached bryozoans (leached after cement precipitation); porosity is inter-and intraparticle, and moldic. |
| 56.0 |
Same as above, with molluscan molds and fragments, partially leached foraminifers, partially leached bryozoans, and partially leached echinoid fragments with non-leached overgrowths; 30% medium quartz, feldspar (<1%), and phosphatic (<1%) sand in a partially recrystallized matrix (microspar); some cement may be meniscus. |
| 60.0 |
Very sandy molluscan packstone with 30% medium quartz sand in patches of micrite (20%) matrix, with minor microspar, overlain by blocky and dog-tooth sparry calcite cement (cement is finer than at 56 ft); moldic porosity is in mollusk and echinoid voids; foraminifers, calcitic mollusk, and bryozoan fragments. |
| 65.0 |
Molluscan wackestone-packstone to calcareous sandstone with <15% micrite matrix and nearly 40% medium quartz and phosphatic (<1%) sand; skeletal grains include molds and fragments, partially leached benthic foraminifers, bryozoans, and echinoids; blocky calcite cement on surfaces, some micrite-coated; micrite cement is meniscus; porosity is high (30%) inter- and intraparticle, and moldic. |
| 66.5 |
Similar to above, molluscan packstone, with ~30% fine to medium quartz sand, barely cemented with micrite (~10%); skeletal leached benthic foraminifers and mollusks; echinoid, bryozoan, foraminifer, and molluscan fragments; minor void-filling blocky and dogtooth cement; porosity is very high (~30%), inter-, intraparticle, and moldic. |
| 67.7 |
Molluscan packstone with ~30% medium quartz sand and ~10% micrite matrix; blocky and dogtooth spar; patches of micrite (10%); skeletal grains include bryozoans, echinoids, and partially leached benthic foraminifers and mollusks; very high inter- and intraparticle, and moldic porosity (30%); similar to 65 and 66.5 ft. |
| 69.6 |
Sandy packstone with 20% fine quartz sand to silt and 5% micrite matrix; skeletal grains include bryozoan, ostracode, and partially leached mollusk, benthic foraminifers, echinoid, and red algae (not observed in higher samples) fragments (this sample is more leached than the one above); blocky and dogtooth surfaces; micrite envelopes serve as nucleation sites for cement; high inter- and intraparticle and moldic porosity (30%); geopetal structures in bryozoan and ostracode chambers. |
| 71.7 |
Sandy packstone with 20% micrite matrix and 20% medium quartz and phosphatic (<1%) sand; one generation of blocky to dogtooth void-filling cement and syntaxial echinoid overgrowths, skeletal grains include ostracodes and bryozoans and partially leached red algae, mollusk, foram, echinoid, and barnacle fragments; high intraparticle and moldic porosity (30%). |
| 75.2 |
Sandy packstone with 15% micrite matrix and 30% fine phosphatic and medium quartz sand; skeletal grains include planktonic and benthic foraminifers, ostracodes, echinoids, and mollusks molds and fragments; meniscus micrite cement overlain by a dogtoothrhombic calcite cement. |
| 79.2 |
Similar to above but less cement, isopachous cement has more needle shape; 10% micrite matrix, and less leached skeletal grains; 30% fine phosphatic and quartz sand, skeletal grains include benthic and planktonic foraminifers, bryozoans, echinoids, and molluscan molds and fragments; syntaxial echinoid overgrowths; high porosity. |
| 81.8 |
Similar to sample above, molluscan packstone to calcareous sandstone with 30% medium quartz and fine phosphatic (<1%) sand and 10% micrite matrix adhering to grains, some may be meniscus; minor amount of dogtooth sparry calcite cement primarily on foraminifers; skeletal grains include benthic and planktonic foraminifers, ostracodes, leached red algae, and echinoids with thin syntaxial overgrowths; high intraparticle and moldic porosity. |
| 85.0 |
Very sandy packstone to calcareous sandstone with about 20% micrite matrix; fine quartz (30%) and phosphatic (1%) sand; skeletal grains include molluscan molds and fragments, benthic and planktonic foraminifers, ostracodes, bryozoans, red algae, echinoid (with syntaxial overgrowths), and barnacles; porosity is inter- and intraparticle, and moldic, with no sparry calcite filling in the molds, thin layer of dogtooth spar on micrite envelopes and foraminifers. |
| 87.8 |
Calcareous, molluscan sandstone with about 10% patchy meniscus(?) micrite cement/matrix; fine quartz (~50%) and phosphatic (1%) sand; molluscan molds with micrite envelopes and bored fragments, partially leached benthic and planktonic foraminifers, leached echinoids; dogtooth spar is rare on skeletal grains; porosity is high (>39%) and is interparticle and moldic. |
| 90.6 |
Calcareous skeletal sandstone with patchy meniscus micrite cement/matrix; fine to medium quartz (45%) and phosphatic (<1%) sand; skeletal grains include molluscan molds (with micrite envelopes) and fragments, benthic and planktonic foraminifers, ostracodes, bryozoans, red algae, and echinoids with syntaxial overgrowths; rare dogtooth spar on skeletal grains, no void-filling cement; porosity is high (30%) and is inter- and intraparticle, and moldic. |
| 94.7 |
Calcareous molluscan sandstone with 5% micrite matrix or cement; fine quartz (45%) and phosphatic (<1%) silt and sand; skeletal grains include molluscan molds (with micrite envelopes) and fragments, benthic and planktonic foraminifers, ostracodes, bryozoans, and echinoids; porosity is high (30%) and is inter- and intraparticle and moldic; rare dogtooth spar on skeletal grains. |
| 96.9 |
Calcareous molluscan sandstone with 5% micrite matrix or cement; fine quartz (50%) and phosphatic (<1%) silt and sand; skeletal grains include molluscan molds (micrite envelopes) and fragments, benthic and planktonic foraminifers, ostracodes, and echinoids with syntaxial overgrowths; porosity is interparticle and moldic, no void-filling cements; small amount of blocky to dogtooth spar on skeletal grains and micrite envelopes. |
| 110.0 |
Packstone to calcareous sandstone with about 20% micrite matrix; fine to medium quartz sand (40%) and phosphatic silt (<1%) and peloids; skeletal grains include molluscan molds and fragments, benthic foraminifers, ostracodes, and echinoids; moderate porosity is 15% and is inter- and intraparticle, and moldic; small amount of dogtooth spar on some skeletal grains. Unnamed formation |
| 129.0 |
Dolostone with 40% burrowed(?) dolomicrite matrix; medium quartz sand (10%); skeletal grains include molluscan molds with micrite envelopes and bored in-infilled fragments, leached benthic foraminifers and bryozoans, ostracodes, and barnacles; moderate porosity is about 10% and primarily moldic and in vugs and channels; dolomite rhombs are 50 µm, both euhedral and anhedral, void-filling dolomite, cement grain-size increases away from grain surfaces. |
| 129.5 |
Dolo-packstone with 30% dolomicrite matrix and quartz silt (5%); skeletal grains include molluscan molds with micrite envelopes, leached benthic foraminifers, and ostracodes; dolomite is 30 to 50 µm, euhedral and anhedral; porosity is low and moldic with minor shelter porosity. |
| 129.8 |
Packstone with 15% peloidal micrite matrix and <5% quartz silt to fine sand; skeletal grains include molluscan molds and bored micritized fragments, partially leached benthic foraminifers, and ostracodes; dogtooth and blocky calcite fill voids, and minor void-filling dolomite (40 µm) precipitated after the calcite; porosity is moldic. |
| 131.0 |
Wackestone to calcareous sandstone of medium quartz (50%) and fine phosphatic (<1%) sand with a micrite matrix (30%); skeletal grains include molluscan molds with micrite envelopes and bored fragments, leached benthic foraminifers, and bryozoans; early bladed calcite cement overlain by small amount of dolomite in voids; porosity is low, intraparticle and moldic; geopetal structures. |
| 132.0 |
Wackestone with up to 60% micrite matrix and <1% quartz and phosphatic silt; unevenly distributed; skeletal grains include molluscan molds and fragments, benthic foraminifers, ostracodes, and echinoids; blocky calcite cement in voids; porosity is moldic. |
| 133.0 |
Wackestone with 50% micrite matrix and fine quartz sand (20%), peloids; skeletal grains include molluscan molds and micritized fragments, some bored benthic foraminifers, ostracodes, and leached echinoids; virtually no cement except in chambers of leached gastropod on geopetal mud; possible desiccation cracks. |
| 140.1 |
Dolostone of nearly 70% dolomicrite with 5% medium quartz sand and very few molluscan molds; dolomite rhombs are <40 µm, euhedral to anhedral; desiccation cracks; porosity is low (<10%) and moldic. |
| 142.3 |
Dolostone, very similar to above sample, but dolomite rhombs are smaller (10 µm); there is slightly more quartz sand; all molds are mud-filled. |
| 145.4 |
Dolostone, with 5% medium quartz sand in a dolomicrite matrix (60%); a few molluscan molds and leached foraminifers; desiccation cracks. |
| 146.0 |
Dolostone, with 20% medium to very coarse quartz sand in a dolomicrite matrix (60%); skeletal grains include mollusk and benthic foraminifer molds; sand is clumpy and unevenly distributed; porosity is high (25-30%) and is primarily moldic; dolomite grain size is very small. |
| 154.5 |
Sandy dolostone with minor dolomite (micrite to 50-µm grains) concentrated at grain contacts as meniscus cement; skeletal grains include mollusk and benthic foraminifer molds; some euhedral dolomite rhombs have hollow centers; medium to very coarse quartz sand (35%); poorly sorted; porosity is moldic. |
| 163.4 |
Dolomitic sandstone with 50% fine to very coarse quartz sand and 50-µm dolomite rhombs (no hollow center as above) concentrated at grain contacts; no skeletal grains. |
| 171.9 |
Calcareous sandstone, with >50% fine and very coarse quartz sand in bimodal distribution; virtually no matrix; rounded molluscan fragments, some leached; very low porosity; pores filled with calcite cement almost poikilotopic, but individual crystals do not engulf several quartz grains. |
| 176.5 |
Calcareous sandstone with >50% fine and very coarse bimodal quartz sand; rounded mollusk and bryozoan fragments, less well-cemented and more leached than sample above; porosity is high (25%), interparticle, and moldic; calcite cement, as above. |
| 177.9 |
Calcareous sandstone, with 60% fine to very coarse bimodal quartz sand, rounded molluscan fragments, slight meniscus microspar cements on quartz grains; blocky and dogtooth sparry cements; very high (>30%) porosity, both interparticle and moldic. |
| 188.0 |
Dolostone, uniform silt-sized dolomite rhombs with <5% quartz silt; no skeletal grains and very low porosity. |
