Pleistocene and Holocene Carbonate Environments on San by H. Allen Curran, Roger J. Bain, James L. Carew, John E.

By H. Allen Curran, Roger J. Bain, James L. Carew, John E. Mylroie, James W. Teeter, Brian White

About The Product

Published via the yank Geophysical Union as a part of the Field journey Guidebooks Series.

The review topic of this sequence of box tours on San Salvador should be interpretation of paleodepositional environments for the well-exposed Pleistocene and Holocene carbonate rocks that cap the island and popularity of modem analogues from the various carbonate environments discovered at the island and its surrounding shelf. Questions of sea point background, diagenetic switch, and the surficial strategies working on carbonate island terranes will also be thought of. Our journey will commence with a low-attitude overflight to view good points of the most Bahama platform enroute to San Salvador, which lies simply past the japanese fringe of the platform.


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Extra info for Pleistocene and Holocene Carbonate Environments on San Salvador Island, Bahamas: San Salvador Island, Bahamas, July 2-7, 1989

Example text

Southeastern side of Pigeon Creek), tidal flats are developed and support dense stands of red mangrove. Tidal and subtidal flat sediments are finer GRANNY LAKE BASIN and more poorly sorted than those of the tidal channel. A prominent ebb tidal delta extends seaward from the Topography, Lithology, and Depositional Environment entrance of Pigeon Creek. Water depth across the delta The Granny Lake basin represents a Pleistocene, is approximately 1 to 2 m, and maximum tidal fluctuation is approximately 1 m.

Both ridges are extensively cross bedded and represent dune deposits. The flanking dunes restricted and preceded the development of the Granny Lake basin. Flanking the channel at the south end of the Granny Lake basin lies a series of low, gently arcuate beach ridges. The beach ridges are thinly bedded and consist of oosparite and biosparudite. SNOW BAY HIGH{;j HINCHINBROKE. ROCKS ~ ,. ( ) LOW CAY FIGURE 2 The Pigeon Creek tidal delta area. T175: 44 FIGURE 3 1983). Major units exposed in the stratigraphic section of the North Pigeon Creek Quarry (from Thalman, level has revealed compositionally and texturally similar biopelmicrites.

Costata predominating at shallower depths on coarser substrates. This depth distribution pattern may be a response to light dependence. Ostracodes have proven especially . , 1987; Teeter, in press). Three distinct assemblages of ostracode species (Fig. 2), characteristic of different salinities, can be recognized within Holocene deposits. Fresh water species (Fig. 2a-c) occur rarely. Ostracode species characteristic of nonnal marine salinities are more frequently encountered. Three of the more common representatives are shown in Fig.

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