Citation
Folio of South Florida basin

Material Information

Title:
Folio of South Florida basin a preliminary study
Series Title:
Map series ;
Creator:
Oglesby, Woodson R.
Place of Publication:
Tallahassee, Fla.
Publisher:
Florida Geological Survey
Publication Date:
Copyright Date:
1965
Language:
English
Physical Description:
ii, 3 p. : maps (folded) ; 23 cm.

Subjects

Subjects / Keywords:
Geology -- Maps, Physical -- Florida ( lcsh )
Sedimentary basins -- Maps -- Florida ( lcsh )
Maps, Physical -- Florida Watershed -- United States ( lcsh )
Maps -- Sunniland Formation (Fl.) ( lcsh )
Geology -- 1:2,500,000 -- Florida -- 1965 ( local )
Sedimentary basins -- 1:2,500,000 -- Florida -- 1965 ( local )
Geology -- 1:2,500,000 -- Florida -- 1965 ( local )
1:2,500,000 -- Florida Watershed -- United States -- 1965 ( local )
1:2,500,000 -- United States -- Florida Watershed -- 1965 ( local )
Sedimentary basins -- 1:2,500,000 -- Florida -- 1965 ( local )
1:2,500,000 -- Sunniland Formation (Fla.) -- 1965 ( local )
Sunniland Formation -- 1:2,500,000 -- Florida -- 1965 ( local )
Miami metropolitan area ( local )
Lake Trafford ( local )
Key Largo ( local )
City of Tallahassee ( local )
City of Punta Gorda ( local )
Charlotte Harbor ( local )
Limestones ( jstor )
Keys ( jstor )
Evaporites ( jstor )
Carbonates ( jstor )
Industrial refining ( jstor )
Genre:
non-fiction ( marcgt )
Spatial Coverage:
United States of America -- Florida

Notes

General Note:
Includes 6 maps of south Florida at scale ca. 1:2,500,000.
Statement of Responsibility:
by Woodson R. Oglesby.

Record Information

Source Institution:
University of Florida
Holding Location:
University of Florida
Rights Management:
The author dedicated the work to the public domain by waiving all of his or her rights to the work worldwide under copyright law and all related or neighboring legal rights he or she had in the work, to the extent allowable by law.
Resource Identifier:
001923686 ( AlephBibNum )
07115073 ( OCLC )
AJZ9522 ( NOTIS )

Full Text
FLORIDA GEOLOGICAL SURVEY
Robert O. Vernon, Director
MAP SERIES NO. 19
FOLIO OF SOUTH FLORIDA BASIN
A PRELIMINARY STUDY
By
Woodson R. Oglesby
1G3931 MAP LIBRARY C1
n. 19
,4 1965
.04




Completed manuscript received
September 15, 1965
Printed by the Florida Geological Survey (118)
Tallahassee 1965
ii




SOUTH FLORIDA BASIN
By
Woodson R. Oglesby
A PRELIMINARY STUDY
The South Florida Basin extends over approximately 77,000 square miles, as outlined on the accompanying maps. About half of the surface expression of the basin area "s dry land and the remaining half is water bottom land extending to the edge of the Continental Shelf.
The basin was formed prior to the deposition of Trinity age evaporites; which could not have been deposited under normal marine conditions. Observations of well cores confirm that there were repeated cycles of sea water influx, followed by evaporation, as evidenced by the occurrence of repeated cycles of carbonate-evaporite deposition.
In the Punta Gorda Formation, evaporites predominate, which suggests restricted encroachment of the seas upon the land. In the Gulf Oil Company No. 1 State Lease 826-G, Monroe County, the top 350 feet of the Punta Gorda Formation was cored, and penetrated rock as follows:
1.) 40 feet of anhydrite.
2.) 60 feet of oil saturated limestone.
3.) 250 feet of sediment consisting of 216 feet of anhydrite,
15 feet of halite, and only 19 feet of carbonates.
The carbonates occur in seven isolated portions of the 250 feet of cored section.
Of the uppermost 100 feet of the Punta Gorda Formation, the lower 60 feet is dark brown cryptocrystalline limestone which appears petroliferous and yields an oil cut when treated with dilute hydrochloric acid. The section is too tight to produce in this area but is a likely source bed for petroleum. It is capped by 40 feet of anhydrite.
1




The thin carbonate sections noted in statements 1 and 2 probably represent sea water influx, perhaps during storms, when barrier reefs were inundated and breached by wave action. The 60-foot section of cryptocrystalline limestone noted in statement 3 indicates a rather extensive period of continuous influx, possibly denoting a temporary rise in sea level prior to the succeeding period of restricted basinal deposit of 40 feet of anhydrite.
The Sunniland Limestone occurs as a biostrome extending from its up-dip limits, shown on accompanying maps, to Charlotte Harbor on the Southwest, and running thence southeasterly to Key Largo. Within this biostrome there are reef- like bioherms composed largely of chamids, rudistids and other mollusks associated with these sessile builders of rigid frameworks. The flanks of these bioherms are composed of bioclastic mollusk detritus and may contain large Foraminifera such as Operculina and Dictyoconus, The inter-reef areas are occupied by lime muds, now indurated, that frequently contain abundant miliolids and usually lack porosity. For descriptions of similar lithologies, the "Symposium on Edwards Limestone in Central Texas", University of Texas Publication No. 5905, 1959, is recommended.
The Sunniland Limestone interval is largely replaced by evaporites in the trough that parallels the coasts of Collier and Monroe counties. In the Gulf No. 1 State Lease 826-G, evaporites predominate in the cored Sunniland interval, coupled with minor cycles of influx, during which periods calcilutites were precipitated.
The Sunniland Limestone, or its equivalent, is present in the Marquesas Keys and is inferred to extend NNW paralleling the Collier-Monroe trough mentioned above. The Broward Syncline, is indicated as occurring NNE of the Sunniland shelf.
During Washita-Fredericksburg time, the cyclic deposition of carbonate-evaporite series persisted. The close of the Lower Cretaceous is marked by a final deposit of anhydrite which is immediately overlain by one foot of green shale .inr the Humble No. 1 Collier Corporation, located east of Naples, in Collier County. A basal Fredericksburg shaly calcilutite overlies the green shale, followed by 300 feet of Austin Age calcilutite and chalk. This grades upward into pure white chalk which persists almost uninterrupted throughout approximately 3,000 feet of Gulfian depo-




SOUTH FLORIDA BASIN 3
sition. The absence of evaporites in the Upper Cretaceous evidences widespread encroachment of epicontinental seas, which occurred simultaneously in the mid-continent of North America and in general throughout the world.
The Paleocene Series is marked by a re-occurrence of carbonate-evaporite cycles indicating a general restriction of the seas during this interval. It is assumed that the barriers which cut off unrestricted access to the Atlantic and the Gulf of Mexico from the South Florida Basin during the Comanchean era, were either resurrected at the end of the Gulfian time, or were not destroyed during the Gulfian inundation.
The Eocene-to-Recent interval does not contain evaporites in the geographical locale of the South Florida Basin. This indicates free access to the seas and the formation of a physiographic platform as opposed to the underlying structural basin of preceding eras.
The following maps and cross sections are available at a larger scale. Scale and prices may be obtained upon request. Address inquiries to: Florida Geological Survey, P. O. Box 631, Tallahassee, Florida 32302.




_ I
-... ..- -12000
_. o LCOALL 14-I
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1050
\__ ._ \
T E N
SOUTH FLORIDA BASINGlLAKE TRAFFORD ..GSGO
STRUCTURAL CONTOURS 1100---7-_...___'_,
OS~~ ~ 91 2 Sti NE0
Appro.Scalr-Mile ? U CONTOUR INTERVAL 500 FE- "U B A
The contours reflect structure at the close of Lake 11524' Limestone, medium-sized crystals, with Trafford deposition. The Lake Trafford Formation is pro- some intercrystalline porosity; heavy oil posed to replace the names "upper anhydrite" or "upper stain and cut. massive anhydrite" used informally by the oil industry 11531' Anhydrite, white in matrix of black (carto designate the impervious beds which overlie the Sunni- bonaceous?) limestone. land Limestone. Limestone brown, dense, lithographic.
11560'-11561' Anhydrite, white, in matrix of limestone, The type well of the Lake Trafford Formation is desig- brown, dense to medium crystalline.
nated the Humble Oil and Refining Company #1 J. A. Curry 11561'-11562' Limestone, buff to tan, medium to coarse in Collier County about 2/ miles east of Lake Trafford crystalline.
-1650' S. of N/line and 1650' E. of W/line of Section 8, 11566'-11571' Limestone, tan medium crystalline to T 47 S, R 29 E. dense
11571'-11574' Limestone, brown, fossiliferous, hard reThe entire section was diamond cored in the type crystallized.
well; portions of the cores are available for study at the 11574'-11577' Limestone brown, miliolitic, dense. Florida Geological Survey, Tallahassee. A core descrip- 11584'-11589' Limestone, brown dense. tion follows: 11589'-11592' Limestone, brown, dense, fossiliferous and
recrystallized.
Comanche Series 11592'-11612' Anhydrite, white in matrix of limestone,
Lake Trafford Formation (11478'-11612') dense, brown, carbonaceous.
Total thickness 134 feet.
Of the 134-foot section, 38 feet, or slightly less than 11480'-11486' Limestone, brown, lithographic with dolo- 30% is anhydrite. This percentage ranges between 10%
mite phelocrysts, and 50% in the Charlotte Harbor to Key Largo Trend. Cor11501'-11505' Limestone, buff to tan, microcoquina of relations of the Lake Trafford Formation are easily taken
milliolids and ostracods to buff, finely from electric logs; dense hard limestones grade laterally sucrosic limestone with molluscan frag- to equally dense anhydrites, which appear similar on stanments, visible porosity. dard E. S. or I. E. S. logs. Gamma-neutron and density 11508'-11518' Limestone, buff to brown, dense, litho- 'logs are useful in discriminating between dense limestones
graphic. and anhydrites within the section.




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STRUCTURAL CONTOURS L-01
FLORIDA BOARDof CONSERVATION U 9
p r e p a r e d b y D IV IS IO N o f G E O L O G Y M- u r- .s c l M l a Z O 0 G 7 __ 7
by Woodson Oglesby CONTOUR INTER AL 500 FEEU T
The structure of the South Florida Basin at the close on section B-B', (on reverse side), modified after Maher of Sunniland Limestone deposition is shown on the accom- (1964). The origin of the steep-walled straits is attributed panying map. to faulting which probably extends southwestward between the Florida Keys and Cay Sal.
The basin persisted from pre-Cretaceous time through
the Cedar Keys anhydrite (Paleocene). This is demonstra- The Andros Island well (cf. section B-B') did not ted by repeated sequences of carbonates alternating with contain the evaporites found in the South Florida Basin, anhydrites. The overall known thickness of the carbonate- indicating separate environments of deposition. anhydrite sequences attained 10,000' at Charlotte Harbor (California-Coastal FSL 224 B-i) and 11,000' in the Mar- Cross section B-B' was constructed by John C. Maher quesas Keys (Gulf FSL 826-Y). of the U. S. G. S., Research, Division of Marine Geology, as part of a series extending along the eastern coast of The Sunniland Limestone has been defined by Applin the United States. (U. S. G. S. Prof. Paper 400-B, pp. B209-211, 1960). The present map conforms to Mr. Applin's definition. The modifications show probable faulting to account for the steep profile of the Florida Straits, and the replaceSeismic section A-A' was modified after Antoine and ment of Sunniland Limestone by anhydrite in wells 109 Ewing (Jour. Geophys. Research, April, 1963). The Creta- and 105. ceous thins rapidly at the western end of the seismic section, indicating the basin rim, which approximates the In well 2, at Andros Island, the Comanche to Midway margin of the continental shelf. interval consists exclusively of carbonates, whereas there are numerous evaporites present in a similar interval in The zone of faulting shown north of Cuba is modified well 104 at Key Largo. It is therefore inferred that the after Pressler (Bull. A. A. P. G., 1947, pp. 1851-62). The eastern rim of the South Florida Basin occurs between




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STRUCTURAL COtTOURS
FLORIDA BOARD of CONSERVATION 7_.._ _AU_ DN._ _G ?_D
prepared by D IV ISIO N of G EO LO G Y ,', r sea M l 7
by Woodson Oglesby CONIOU INTEtWL 500 FC U B A
The structure of the South Florida Basin at the close on section B-B', (on reverse side), modified after Maher of Sunniland Limestone deposition is shown on the accom- (1964). The origin of the steep-walled straits is attributed panying map. to faulting which probably extends southwestward between the Florida Keys and Cay Sal.
The basin persisted from pre-Cretaceous time through
the Cedar Keys anhydrite (Paleocene). This is demonstra- The Andros Island well (of. section B-B') did not ted by repeated sequences of carbonates alternating with contain the evaporites found in the South Florida Basin, anhydrites. The overall known thickness of the carbonate- indicating separate environments of deposition. anhydrite sequences attained 10,000' at Charlotte Harbor (California-Coastal FSL 224 B-i) and 11,000' in the Mar- Cross section B-B' was constructed by John C. Maher quesas Keys (Gulf FSL 826-Y). of the U. S. G. S., Research, Division of Marine Geology, as part of a series extending along the eastern coast of The Sunniland Limestone has been defined by Applin the United States. (U. S. G. S. Prof. Paper 400-B, pp. B209-211, 1960). The present map conforms to Mr. Applin's definition. The modifications show probable faulting to account for the steep profile of the Florida Straits, and the replaceSeismic section A-A' was modified after Antoine and ment of Sunniland Limestone by anhydrite in wells 109 Ewing (Jour. Geophys. Research, April, 1963). The Creta- and 105. ceous thins rapidly at the western end of the seismic section, indicating the basin rim, which approximates the In well 2, at Andros Island, the Comanche to Midway margin of the continental shelf. interval consists exclusively of carbonates, whereas there are numerous evaporites present in a similar interval in The zone of faulting shown north of Cuba is modified well 104 at Key Largo. It is therefore inferred that the after Pressler (Bull. A. A. P. G., 1947, pp. 1851-62). The eastern rim of the South Florida Basin occurs between postulated faulting along the straits of Florida is shown wells 104 and 2.




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I GULF,No.1,State ofFlorida
GULF,No.1,State of Florida GULF, No.l,Stoteof Florida Lat.25'00'53"N, SINCLAIR,No.1,H.R.Williams BAHAMAS LTDNo.1,Andros Island S Lat.243659 N,Long.8T2'20'W Sec.2,T67S,R29E Long.81'05'54"W Sec. 24,T59S,R40E Lat.245237 N,Long.7801'55W e *
AGE MONROE CO.Alt.52' MONROE CO.D.F 23' MONROE CO. Alt.21' MONROE CO. D.F 20' ANDROS ISLAND Alt.20' AGE
42.9Mi 34Mi W 49.5Mi 145Mi ANDROS NE.P rovidenceChannel V y SUA LOAF BIG PINE KEY Florida Bay KEY LARGO iSEALEVELstraits of Florida ISLAND SEA LEVEL .== I ______,_POST-MIOCENE S ISLA C I MICEEPOST-MICN 10MIOCENE 00FMS GreatBahamaBank
-1000 1000 ---- 1000 -100A0 -'1000-
--- .. .. (UPPER 200-FMS- -- a
NOOA EOCENE) OLIGOCENE Cz 2000 LIMESTONE dOF _.
_2000 2000 Identified 2000 2000 -30FMS-_ 20000 ?- 400FilS=
C= 30 -2 9000 4000 4 300 3000500FMS
7.3 Mi,
4000 4000 4000 4000= ,,
__ ea___25 5000 5000 5000 5000 000D U
0o00 6000 6000 100000 0 ii
9.5Mi.
9015-000FMS L
1 000 1000
11000 7---------110001 11000
1000 1000 000 T8'0 M
000T.D. ,631'
19000 90"0 10 9-0
2- /
14000 -Correlations on this cross section are based primarily
15000 by the Southeastern Geological Society(1949) T.D.14,585' = .'T.D.15 ,455' LOCATION OF for the geologic names and correlations committee of the
--CROSS SECTION B-B' iAwMA American Association of Petroleum Geologists
cc ..ISLANDS 10 0 10 20 30 MILES AeJ
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