16 Porosity and Sinkholes 2

16 Porosity and Sinkholes 2 - (low permeability) Surface...

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1. Raising of the Florida platform 2. Lowering of sea levels, interruption of the Suwannee Current 3. Infilling of the Georgia Channel with sediments derived from Appalachian/continental erosion 4. Sea level rise, lack of Suwannee current. 5. Suspended siliciclastic sediments settle over the peninsula These sediments blanket the underlying limestone forming the upper confining layer for the Floridan Aquifer. Beginning 24 million years ago
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The accumulated limestone forming the Florida Platform is overlain by silicon-based deposits of Miocene age. Older limestone Eocene/Oligocene Limestone (55 – 24 mya) Miocene Clays (Hawthorne) These are typically clayey and called The Hawthorne Formation.
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55 – 24 million years ago Miocene Clays
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Unformatted text preview: (low permeability) Surface Siliciclastics (sandy) (highly permeable) The Floridan aquifer is a confined aquifer. The water-bearing unit is permeable limestone. Low Permeability Confining Unit (poor water movement) Unconfined aquifer is extensive throughout the state of Florida Low permeability rock (confining) Overall Picture Low permeability rock The water-bearing unit of the Floridan Aquifer is a confined, consolidated limestone formation. The Floridan Aquifer The Water-bearing Unit is Consolidated Limestone Magnesium Carbonate MgCO 3 How does this material hold and deliver water? limestone Calcium Carbonate CaCO 3 However, it is extremely productive 3 - 4 billion gallons / day...
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16 Porosity and Sinkholes 2 - (low permeability) Surface...

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