| 0 - 5.0' |
Peat and Organic Sediment (not described). |
| 5.0 - 7.42' |
Grainstone-Packstone, mixed peloidal (60%) and bivalve allochems (5%) with varying amounts of lime mud matrix. Possible intraclasts at 6.5-7.0', possible encrusting bryozoan at 7.7'. Moderate well cemented. Porosity includes both pelmoldic in matrix and large open and partially filled vugs. Vugs perhaps related to bryozoan molds. Very high effective porosity.
2.5Y 8/1 to 8/2, pale yellow (tan). |
| 7.42 - 7.75' |
Lime Wackestone (calcrete), mud-rich interval with several dark-brown laminated horizons. Interval is dense, very well cemented. Porosity is <10% with a few small vugs and minor intraparticle.
2.5Y 7/3 pale yellow (tan with brown layers). |
| 7.75-9.50' |
No recovery, base of core run. Core normalized to run top. |
| 9.50-10.40' |
Lime Wackestone matrix with dark-brown laminated horizons (calcrete). Well cemented, dense. Lower half of interval appears brecciated with intraclasts, some darkened. Possible soil breccia. Porosity estimated at 15%, mostly vuggy ÿ related to moldic dissolution.
5YR 7/2 pinkish gray (red-orange stained) with 10YR 7/1 light gray. |
| 7.00-8 |
Lime Mudstone with red-orange staining. Mostly lime mud with calcrete laminations and some possible (soil?) breccia. Interval contains root molds and is dense and very well cemented. Low effective porosity, few isolated vugs with calcite infill.
5YR 7/2 pinkish gray (red-orange stained). |
| 11.00-11.42' |
Lime Wackestone, mixture of lime mud with >10% thin-walled bivalve fragments (as molds). Interval includes possible root molds, some infilled with LMC spar. <10% porosity due to some open molds, microporosity. Low effective porosity.
10YR 7/1 light gray (tan to very light brown). |
| 11.42-11.80' |
Lime packstone, bivalve fragments with some lime mud. Moderately well cemented. Many of the bivalve fragments are leached, yielding ~15% moldic porosity.
10YR 7/1 light gray (tan to very light brown). |
| 11.80-12.50' |
Mixed Lime Mudstone with thin Lime Wackestone intervals containing bivalve fragments. Wackestone units have moldic dissolution of bivalves allochems, mudstone units dense, well cemented.
10YR 7/1 light gray (tan to very light brown). |
| 12.50' |
Base of core run at 12.5'. |
| 12.50-13.83' |
Lime packstone, bivalve and gastropods fragments with occasional oyster fragment. Moldic porosity (15-20%) due to dissolution of mollusc allochems, moderate-high effective porosity.
10YR 7/1 light gray (tan to very light brown). |
| 13.83-14.80' |
Bivalve Floatstone in a Packstone to Wackestone matrix. Skeletal sands (bivalves, benthic foraminifers, gastropods) with varying amounts of lime mud in the matrix. Many skeletal allochems are leached, yielding moldic porosity and some large vugs. Total porosity is estimated at 15-20%. High effective porosity.
10YR 7/1 light gray (tan to very light brown). |
| 14.80-17.50' |
No recovery, core normalized to top of run. Base of core run at 17.50'. |
| 17.5' |
Possible hardground or subaerial exposure surface. |
| 17.5-17.83' |
Lime mudstone with shell-filled burrows. Burrows are mostly bivalve fragments with possible benthic foraminifers. Shell debris leached and burrows now friable and form vugs. Moldic porosity in burrow fills, otherwise mud-rich areas have relatively low effective porosity.
10YR 8/1 white (light tan). |
| 17.83-19.90 |
Alternating Lime Wackestone and Packstone intervals. Packstone intervals laminated/bedded (possible beach facies) with fenestral porosity up to 30%. Skeletal allochems include bivalves and high-spired gastropods. Beside fenestral porosity in the packstone, those intervals also have some moldic porosity, overall estimated at 15-20%. Mudstone units have relatively low porosity. Interval is moderately well cemented.
10YR 8/1 white (light tan). |
| 19.90-22.5' |
No recovery, core normalized to top of run. Base of core run at 22.5'. |
| 22.5'-22.75' |
(rubble, possible drilling debris between core runs) Lime Packstone to Wackestone, bivalve shell hash with patches of lime wackestone (original fabric uncertain due to rubble). Skeletal allochems occur as either molds or casts, most leached. Moldic and vuggy porosity likely in undisturbed rock.
10YR 8/1 white (light tan). |
| 22.75-24.10' |
Lime Wackestone to Lime Mudstone. Lime mud with varying amounts of skeletal debris (0-10%). Skeletal allochems are mostly gastropods. Interval is very dense, very well cemented, massive. Contains some vertical root-related structures, some open and some filled with LMC spar. Root traces range from 5 mm to 3 cm long. Few horizontal fractures filled with LMC calcite.
(likely a freshwater limestone deposit)
10YR 8/1 white (light tan) |
| 24.10-24.50' |
Gastropod Rudstone to Floatstone. Gastropod shell hash, now mainly molds and casts remaining, some up to 1 cm diameter. Matrix is mainly shell material with low lime mud, but contains a mud-rich interval at about 24.3'. Porosity is from 25-30% moldic, high to very high effective porosity.
(Planorbella gastropod indicates a freshwater limestone deposit)
10YR 7/1 light gray (tan). |
| 24.50-27.50' |
No recovery, core normalized to top of run. Base of core run at 27.5'. |
| 27.50-29.83' |
Lime Packstone. Bivalve and gastropod skeletal sand in a matrix containing some lime mud. Interval contains possible shell-filled burrows. Occasional large (1 cm) bivalve mold or cast. Most skeletal fragments leached, moldic porosity in the range of 10-13%. Moderate effective porosity.
10YR 8/1 white (light tan). |
| 29.83-30.60' |
Bivalve Floatstone/Rudstone with a matrix of mixed skeletal sand and lime mud (packstone/wackestone). Large (>2mm) bivalve fragments some original shell material, or as cast/mold (1-3 cm long). Interval contains ~15% moldic/vug porosity, many large vugs from bivalve molds.
10YR 8/1 white (light tan). |
| 30.60-31.00' |
Lime Packstone. Same texture and color as interval 27.50-29.83'. |
| 31.00-32.50' |
No recovery, core normalized to top of run. Base of core run at 32.5'. |
| 32.50-33.50' |
Bivalve Floatstone with a matrix of mixed skeletal sand and lime mud (packstone-wackestone). Matrix is a mixture of fine skeletal sand and lime mud. Possible shell-filled burrows. Many bivalve fragments are leached and now yield moldic and vuggy porosity. Total porosity is estimated at 15-20%, moderate to high effective porosity.
10YR 8/1 white (light tan). |
| 33.50' |
Bottom of core. |
