|Cedar Keys/Lawson, Central Florida Region
The lower Tertiary and Upper Cretaceous carbonate units are continuous across central Florida (Randazzo, 1997). Moreover, it has been clearly and thoroughly demonstrated that the highly permeable intervals, including the Boulder Zones, in the Floridan aquifer are regionally continuous (Miller, 1986, 1997; Winston, 1996). However, there is no published information regarding the continuity of permeable zones in the lower Cedar Keys and upper Lawson Dolomites. Winston (1977) stated that porosity in the Lawson Dolomite in central Florida is occasionally present and can be quite high. Applin and Applin (1944, 1967), Vernon (1951), and Winston (1994) indicated that this interval is permeable. The cross sections of Chen (1965, his figs. 20, 21) are perhaps the best published information regarding the lithologic variability in these units. On the basis of the variation in lithologic descriptions from this interval, we infer that permeability varies in these units as a function of both sedimentologic and diagenetic processes, which is characteristic of carbonate units. It is possible to map the continuity of porous/permeable zones using geophysical logs but is beyond the scope of the present project.
Applin, P. L., and Applin, E. R., 1944, Regional subsurface stratigraphy and structure of Florida and southern Georgia: American Association of Petroleum Geologists, v. 28, p. 1673–1753.
___________ 1967, The Gulf Series in the subsurface in northern Florida and southern Georgia: U.S. Geological Survey, Professional Paper 524-G, 35 p., 8 plates
Chen, S. C., 1965, The regional stratigraphic analysis of Paleocene and Eocene rocks of Florida: Florida Geological Survey Bulletin No. 45, 105 p.
Miller, J. A., 1986, Hydrogeologic framework of the Floridan Aquifer system in Florida and in parts of Georgia, Alabama, and South Carolina: U.S. Geological Survey, Professional Paper 1403-B, 91 p., 33 plates.
___________ 1997, Hydrogeology of Florida, in Randazzo, A. F., and Jones, D. S., eds., The geology of Florida: Tallahassee, University of Florida Press, p. 69–88.
Randazzo, A. F., 1997, The sedimentary platform of Florida: Mesozoic to Cenozoic, in Randazzo, A. F., and Jones, D. S., eds., The geology of Florida: Tallahassee, University of Florida Press, p. 39–56.
Vernon, R. O., 1951, The geology of Citrus and Levy counties, Florida: Florida Geological Survey Bulletin 33, 256 p.
Winston, G. O., 1977, Cotype wells for the five classic formations in peninsular Florida: Gulf Coast Association of Geological Societies Transactions, v. 27, p. 421–427.
___________ 1994, The Paleogene of Florida, v. 3. Lithostratigraphy of the Cedar Keys Formation of the Paleocene and Upper Cretaceous age—Peninsular Florida and environs: Miami Geological Survey, 52 p.
___________ 1996, The Boulder Zone dolomites of Florida, v. 2, Paleogene zones of the southwestern peninsula: Miami Geological Society, 62 p.