FLORIDA GEOLOGICAL SURVEY


(1988), Hickey (1982), Sacks (1996), Stewart
(1966), O'Reilly et al. (2002) and unpublished
SWFWMD ROMP reports are also used to
interpolate the MFCU surface.

 Miller's (1986) unit II, which reaches depths
of -1,900 ft (-579.1 m) MSL in Sarasota County
correlates with most of the MFCU surface (Plate
59). Unit VI (Miller, 1986) reaches depths of -
2,100 ft (-640.1 m) MSL in southeastern DeSoto
County and along the southern half of Charlotte
County. According to data from Miller (1988),
the two units overlap in western
Highlands/eastern DeSoto Counties as well as
western Charlotte and Lee Counties. Several
wells investigated by Miller (1986, 1988) and in
the present study indicate that the MFCU may
not be laterally continuous throughout the study
area; however for purposes of regional mapping,
the MFCU is contoured continuously and the
areas in question are annotated (Plate 59).


 The initial protocol for mapping the MFCU
was to reflect the uppermost occurrence of the
unit in a borehole using the lithologic criteria
outlined above. This method, however, yielded
anomalous surface patterns and vertical
discontinuities where Miller's (1986) units II
and VI coexist in a well. A MFCU surface map
based on this initial protocol yielded two dome-
like features in the southern region in the
vicinity of these wells. The domes represented
unit II overlying unit VI, separated by high
permeability zones (Miller, 1988) and thus did
not reflect a contiguous mappable surface. The
distribution of well control for unit II (Plate 59)
also brings into question the degree to which
unit II is laterally continuous. Many sufficiently
deep wells within the extent of unit II do not
encounter the unit. It is also noteworthy that
Miller (1986) describes units II and VI as having
nearly indistinguishable lithologic characteristics.


Figure 39. Interpretations of the MFCU in the study area. Upper cross section reflects MFCU units
mapped by Miller (1986); lower cross section reflects alternate interpretation showing continuity
between Miller's units II and VI, with isolated MFCU middle to upper Avon Park confinement
overlying the deeper, more laterally continuous unit. See Plate 59 for cross-section location.


 A A'
 NORTH 9 e SOUTH
 Feet  I F
 MSL 0 00 C 00 MSL
 0 0

 -500- -500
Miller (1986.1988)
MFCU -1000- --1000
Unit II F -
UnitVl V- -1500

 -2000. -2000

 -2500- -2500


Present Study 0 0
MFCU = -so- -so5
L o c a lly 0
Shallow m -10oo -1000
MFCU 1