PART II: Depositional Framework of Pleistocene Rocks in South Florida

Perkins, Ronald D.

doi:10.1130/mem147-p131

Cited by 102 publications

(171 citation statements)

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“…Ecological Shifts along the Florida Reef Tractin the northeast for approximately 170 km to the southwest, terminating at the Newfound Harbor Keys. The entire Pleistocene section is of variable composition and consists of at least five punctuated stratigraphic units (parasequences) separated by unconformity surfaces (Perkins 1977;Multer et al 2002a). These units record the major Pleistocene high-stands of sea level on the south Florida Peninsula.…”

Section: The Pleistocene Reef Systemmentioning

confidence: 99%

“…These exposed sections are equivalent to the Q5 unit of Perkins (1977). The reefs were formed during the last major interglacial high sea-level stand (MIS 5e) and are equivalent to and transitional with the oolitic facies of the Miami Limestone (Coniglio and Harrison 1983;Kindinger 1986;Evans 1987;Shinn et al 1989).…”

Section: The Pleistocene Reef Systemmentioning

confidence: 99%

“…Adjacent, patch reefs are often engulfed by these migrating sands. Perkins (1977) proposed that similar sand shoals and patch reefs migrated landward during Pleistocene (Q5) sea-level rise on a carbonate ramp and did not require a seaward reef barrier for its inception. At sea-level maximum, the leading shallowest edge of the transgressive unit was preserved as an arcuate patch-reef and skeletal-sand complex.…”

Section: The Pleistocene Reef Systemmentioning

confidence: 99%

“…Hypothesis 4: Perkins (1977) proposed an explanation based on an analogy with the modern shelf-margin sand-shoal complex, White Bank, and associated inner-shelf patch reefs. The present-day White Bank is a continuous sand shoal that is 40 km long and 1 to 2 km wide.…”

Section: The Pleistocene Reef Systemmentioning

confidence: 99%

“…Hypothesis 3: Linear concentrations of lagoonal back-reef corals grew along the edge of an elongate, submerged, antecedent high (Dodd, Hattin, and Liebe 1973). Hypothesis 4: The shelf-margin sand-shoal complex known as White Bank, and associated inner-shelf patch reefs, are the modern-day analogy for the exposed Key Largo Limestone (Perkins 1977). Similar shelf-margin sand shoals and patch reefs migrated landward during Pleistocene (Q5) sea-level rise and did not require a seaward reef barrier for their inception.…”

Section: The Pleistocene Reef Systemmentioning

confidence: 99%

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Ecological Shifts along the Florida Reef Tract: The Past as a Key to the Future

Precht

Miller

Geological Approaches to Coral Reef Ecology

122

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Section: The Pleistocene Reef Systemmentioning

confidence: 99%

Section: The Pleistocene Reef Systemmentioning

confidence: 99%

Section: The Pleistocene Reef Systemmentioning

confidence: 99%

Section: The Pleistocene Reef Systemmentioning

confidence: 99%

Section: The Pleistocene Reef Systemmentioning

confidence: 99%

See 3 more Smart Citations

Ecological Shifts along the Florida Reef Tract: The Past as a Key to the Future

Precht

Miller

Geological Approaches to Coral Reef Ecology

122

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Lattice Boltzmann methods applied to large‐scale three‐dimensional virtual cores constructed from digital optical borehole images of the karst carbonate Biscayne aquifer in southeastern Florida

Sukop

Cunningham

2014

Water Resources Research

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Digital optical borehole images at approximately 2 mm vertical resolution and borehole caliper data were used to create three-dimensional renderings of the distribution of (1) matrix porosity and (2) vuggy megaporosity for the karst carbonate Biscayne aquifer in southeastern Florida. The renderings based on the borehole data were used as input into Lattice Boltzmann methods to obtain intrinsic permeability estimates for this extremely transmissive aquifer, where traditional aquifer test methods may fail due to very small drawdowns and non-Darcian flow that can reduce apparent hydraulic conductivity. Variogram analysis of the borehole data suggests a nearly isotropic rock structure at lag lengths up to the nominal borehole diameter. A strong correlation between the diameter of the borehole and the presence of vuggy megaporosity in the data set led to a bias in the variogram where the computed horizontal spatial autocorrelation is strong at lag distances greater than the nominal borehole size. Lattice Boltzmann simulation of flow across a 0.4 3 0.4 3 17 m (2.72 m 3 volume) parallel-walled column of rendered matrix and vuggy megaporosity indicates a high hydraulic conductivity of 53 m s 21 . This value is similar to previous Lattice Boltzmann calculations of hydraulic conductivity in smaller limestone samples of the Biscayne aquifer. The development of simulation methods that reproduce dual-porosity systems with higher resolution and fidelity and that consider flow through horizontally longer renderings could provide improved estimates of the hydraulic conductivity and help to address questions about the importance of scale.

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Biogenic Laminar Calcretes: Evidence of Calcified Root‐Mat Horizons in Paleosols

1991

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Laminar calcretes are described from the Lower Carboniferous of South Wales, the Upper Jurassic of southern England and the Upper Jurassic-Lower Cretaceous of northern Spain. They are interpreted as calcified root-mats (horizontal root systems) and are compared with other examples in the geological record and with possible modern analogues. All three occurrences consist of virtually identical, centimetre to decimetre-thick, locally organic carbon-rich, laminar micrites containing up to 50% by volume of millimetre-sized typically calcite-filled, tubular fenestrae set in an irregular but very finely laminated matrix. It is suggested that root-mat calcretes are probably very common in the geological record in peritidal, lacustrine margin and floodplain deposits, but owing to their crudely biogenic microstructure, they more closely resemble cryptalgal laminites than do other laminar calcretes. The recognition of such root-mat calcretes in sedimentary sequences not only provides evidence of subaerial exposure and vegetation cover but can also indicate positions of palaeo-water-tables in certain circumstances.

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PART II: Depositional Framework of Pleistocene Rocks in South Florida

Cited by 102 publications

References 0 publications

Ecological Shifts along the Florida Reef Tract: The Past as a Key to the Future

Ecological Shifts along the Florida Reef Tract: The Past as a Key to the Future

Lattice Boltzmann methods applied to large‐scale three‐dimensional virtual cores constructed from digital optical borehole images of the karst carbonate Biscayne aquifer in southeastern Florida

Biogenic Laminar Calcretes: Evidence of Calcified Root‐Mat Horizons in Paleosols

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