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Geology and biostratigraphy of the Upper Floridan aquifer in the greater Savannah region, Georgia and South Carolina

机译：大草原地区，格鲁吉亚和南卡罗来纳州上部佛罗里达岛含水层的地质和生物数据库

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The Upper Floridan aquifer (UFA) of South Carolina, Georgia, Alabama, Mississippi, and Florida has been considered a regionally continuous stratigraphic sequence of Eocene to Miocene carbonate strata, with documented unconformities based on lithology and biostratigraphy. As part of an investigation of the regional subsurface geologic framework in the Atlantic Coastal Plain Province, three deep cores were drilled by the U.S. Geological Survey at Pineora, Effingham County, Georgia; Cockspur Island, Chatham County, Georgia; and Palm Dunes, Beaufort County, South Carolina. The age of the UFA based on calcareous nannofossil biostratigraphy ranges from early Oligocene to early Miocene in Pineora, late Eocene to late Oligocene in Cockspur Island, and late Eocene to questionably Miocene in Palm Dunes. Thin section analyses identified eleven unique microfacies across the study area and suggests that the sediments were most likely transported by oceanic currents at the time of deposition. Disconformities are identified from the Pineora and Palm Dunes cores and channel incision is documented at the top of the UFA in the Palm Dunes core. This study 1) documents how existing formation and time stratigraphic boundaries cross hydrogeologic units, 2) shows the complex geologic nature of the Upper Floridan aquifer across a relatively limited area, 3) sets forth a better understanding of how lateral and vertical changes in the lithologic units of the UFA affect permeability and porosity, and thus subsurface hydrologic flow, across the region, and 4) highlights the problems faced by legislators when implementing groundwater use regulations intended to slow salt water intrusion and drawdown.
机译：南卡罗来纳州的上部佛罗里达州含水层（UFA），格鲁吉亚，阿拉巴马州，密西西比州和佛罗里达州被认为是一个区域连续地层序列的虫族碳酸酯阶层，基于岩性和生物数据库的记录不一致。作为大西洋沿海平原省地区地下地质框架调查的一部分，美国埃弗拉·乔治州富特汉县Pineora的美国地质调查钻了三个深层核心; Cockspur岛，查塔姆县，格鲁吉亚;和棕榈沙丘，北卡罗来纳州博福特县。基于钙质Nannofossil生物科学的年龄从早期少茂的UFA的年龄从Pineora早期内突，晚期ocenene在Cockspur岛的后期寡烯，以及棕榈沙丘中的后期诅咒。薄剖面分析确定了整个研究区域的11个独特的微缩放，并表明沉积物最有可能在沉积时由海洋电流运输。从Pineora和Palm Dunes核心识别的Disconformities核心，并且在棕榈沙丘核心的UFA顶部记录了通道切口。本研究1）文件文件如何现有的形成和时间地层边界交叉水电站，2）显示了相对有限的地区佛罗里达州含水层的复杂地质性质，3）阐述了更好地了解岩性横向和垂直变化的横向和垂直变化UFA的单位影响渗透性和孔隙率，因此地下的水文流动，在整个地区和4）突出了立法者在实施地下水采用旨在减缓盐水侵入和绘制的规定时所面临的问题。

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