DolosiltDolomitic limestone

Siltstone

Calcareous dolomite

Glauconite

Moldic porosity

Micritic

Phosphate (common or abundant; greater than 10%)

Chalky

Vuggy porosity

Pellets or pelletal

Clayey Dolomitic

BrecciaOrganic material

ChertShell

Quartz sandstone

Limestone

Floatstone

Silty

No sample

Wackestone

Crystals or crystalline

Primary lithology

Accessory lithologic components or modifiers

Quartz sand

Shell bedLime mudstone

Sucrosic

Fossils or fossiliferousSandy

GrainstoneIntermediate confining unit

Middle semiconfining unit

Surficial aquifer system

Upper Floridan aquifer

Avon Park permeable zone

Lower Floridan aquifer uppermost major permeable zone

Hydrogeologic unitLithostratigraphic and sequence stratigraphic unit upper boundaries

Dolomite

Clay

Packstone

Phosphatic

Conglomerate

Lower Floridan aquifer confining unit

EXPLANATION

EXPLANATION FOR BOREHOLE GEOPHYSICAL DATA CURVES

DescriptionAbbreviation forgeophysical tool or device

Unit of measure Description

1 Number indicates data collection interval number. 2 (spliced) indicates more than one data collection interval is included. If intervals overlap, splicing was done at the deepest depth of the upper interval. 3 Devices run on electrical resistivity tool. 4 Devices run on dual-induction and shallow resistivity tool.

CAL(-6)1

GR (spliced)2

GAMM

RIL

Sonic DT

XCAL, YCAL

Caliper

Gamma ray

Gamma ray

Resistivity from slim hole induction tool (40 centimeter radius of investigation)

Sonic interval transit time or delta t (compensated)

X-caliper and Y-caliper(both on same tool and 90 degrees apart)

in.

GAPI

cps

ohm-m

µsec/ft

in.

Inch

American Petroleum InstituteStandard Units

Counts per second

Ohm-meter

Microseconds per foot

Inch

DPHI Density porosity percent Porosity as a percent

Resistivity long normal (AM electrode spacing = 64 inches) ohm-mRLN3 Ohm-meter

Ohm-meter

Ohm-meter

Ohm-meter

Ohm-meter

ohm-m

ohm-m

ohm-m

ohm-m

Resistivity short normal (AM electrode spacing = 16 inches)RSN3

RILD4Resistivity induction deep (Deep radius of investigation)

RILM4Resistivity induction medium (Medium radius of investigation)

RLL34Resistivity laterolog 3

(Shallow focused resistivity)

Rudstone

Core samples described in this study by R.S. Reese, K.J. Cunningham, or C.M. Wright–shown in depth track of well

Claystone

Avon Park Formation

Lower Arcadia Formation

Arcadia Formation

Arcadia sequences 1 and 2

Upper middle Avon Park Formation

Lower Avon Park Formation

Altitude of land surface, in feet above National Geodetic Vertical Datum of 1929 (NGVD 29).

Lower middle Avon Park Formation

LANDMSL

Avon Park sequence 1– ? Indicates depth is less certain because well does not have borehole geophysical image log data

?

Salinity boundary

Base of brackish groundwater

Drilled-cuttings samples described in this study by R.S. Reese–shown in depth track of well

No data or lithologic description not used

Open hole interval over which no flow zones were identified

Flow zone interpreted from borehole flowmeter and fluid properties geophysical data

Interval not evaluated for flow

Deeper interval not evaluated for flow

Open hole interval over which flow was evaluated

Open hole interval over which no flow zones were identified

Flow zones evaluated in open hole intervals using borehole flowmeter and fluid properties geophysical data and shown in the flow zones column

Base of brackish groundwater

?

Peace RiverFormation

(?- upper boundary not determined)

Upper Arcadia Formation

Avon Parksequence 2, (AP2)

Avon Parksequence 1,

(AP1)

Upper-middle Avon ParkFormation

Lower Arcadia

Formation

Upper Avon Park

Formation

Lower Floridan aquiferuppermost major permeable zone

Avon Park permeable zone

Upper

Floridan

aquifer

Surficial aquifersystem

Intermediate confining unit

Middle semiconfining unit 1

Middle semiconfining unit 2

Lower Floridan confining unit

?-base unknown

Lower-middle Avon ParkFormation

Lower Avon ParkFormation

Arcadia sequences 3 and 4, (AR3, AR4)

Arcadia sequences 1 and 2, (AR1, AR2) ? ?

?

?

??

4.9 milesTie well with section Z-Z'

5.6 miles 1.0 mile 1.78 miles

A'EAST

AWEST

Land surface

DatumNGVD 29

–1,600

–1,200

–1,800

–2,000

–100

–200

–300

–400

–500

–700

–800

–900

–1,000

–1,100

–1,300

–1,400

–1,500

–1,700

–1,900

–2,100

–2,200

–2,400

–2,300

Altit

ude,

in fe

et b

elow

NGV

D 29

–600

Land surface

DatumNGVD 29

–1,600

–1,200

–1,800

-2,000

–100

–200

–300

–400

–500

–700

–800

–900

–1,000

–1,100

–1,300

–1,400

–1,500

-1,700

-1,900

-2,100

Altit

ude,

in fe

et b

elow

NGV

D 29

–600

–1,600

–1,800

–2,000

–1,300

–1,400

–1,500

–1,700

–1,900

–2,100

–2,200

–2,400

–2,300

PALM BEACHBROWARD

BROWARDMIAMI-DADE

ATL

ANTI

C O

CEA

N

Sawgrass Expressway

Florid

a's Tu

rnpik

e

0 2.5 5 MILES

0 2.5 5 KILOMETERS

80°10'80°20'

26°20'

26°10'

26°00'

A'

C'

Z'

A

Z

C

G-2973

G-2968

SUN-I3

G-2916

G-2938

BCN-I1

PB-1775

PB-1766

G-2981

PLT-ROI1

G-2971

G-2984

G-2986

G-2985

NORTH NEW RIVER CANAL

G-2970

G-2961

EXPLANATIONA A' Stratigraphic and hydrogeologic section line -- this plate

G-2984 Well and number

FTL-I4

75

95

595

1441

1

Stratigraphic and hydrogeologic section line -- other platesC C'

G-2916 (site 2) LANDMSL: 17 feet

GR (spliced), in GAPI0 200

CAL (spliced), in inches0 20

RSN (spliced), in ohm-m0 100

RLN (spliced). in ohm-m0 100

Flow

zone

Hydr

ogeo

logi

c un

it

0

100

200

300

400

500

600

700

800

900

1,000

1,100

1,200

Lith

olog

ic d

escr

iptio

n no

t use

dLi

thol

ogy

Dept

h, in

feet

bel

ow

land

sur

face

G-2968 (site 8) LANDMSL: 12.5 feet

GR, in GAPI0 100

XCAL shallow, in inches45 75

YCAL shallow, in inches45 75

XCAL deep, in inches0 20

YCAL deep, in inches0 20 180 120 80

0

100

200

300

400

500

600

700

800

900

1,000

1,100

1,200

1,300

1,400

1,500

1,600

1,700

1,800

1,900

2,000

2,100

2,200

2,300

Lithologic description for interval from 800 to 1,300 feet below land surface is from this study; remainder is from Camp, Dresser, and McKee, Inc. (2008)

Lith

olog

ic d

escr

iptio

n no

t use

dLi

thol

ogy

Hydr

ogeo

logic

uni

t

Sonic DT, µsec/ft

Dept

h, in

feet

bel

ow

land

sur

face

Flow

zone

Upper boundary for Avon Park sequence 1 from sonic geophysical data collected in well G-2969 at the same site

G-2984 (W-19318; test corehole; site 18)GAMM-4, in cps

0 400

CAL-1, in inches0 10

CAL-2, in inches0 10

GAMM-6, in cps0 400

CAL-6, in inches0 10

CAL-7, in inches0 10

RIL-3 shallow, in ohm-m0 60

RIL-6 deep, in ohm-m0 30

Sonic DT-6, µsec/ft170 70Sonic DT-7, µsec/ft220 120

Sonic DT-3, µsec/ft220 120

Hydr

ogeo

logic

uni

t

0

100

200

300

400

500

600

700

800

900

1,000

1,100

1,200

1,300

LANDMSL: 13 feet

Dept

h, in

feet

bel

ow

land

sur

face

Flow

zone

backup curvescale of 270 to 170µsec/ft

Lith

olog

y

Lithologic description from this study.

120 for DT-6

PB-1775 (site 16) LANDMSL: 16.3 feet

XCAL (spliced), in inches0 20YCAL (spliced), in inches

0 20GR (spliced), in GAPI

0 150Sonic DT, in µsec/ft

160 120 60

Lith

olog

y

Flow

zone

Hydr

ogeo

logi

c un

it

0

100

200

300

400

500

600

700

800

900

1,000

1,100

1,200

1,300

1,400

1,500

1,600

Lith

olog

ic d

escr

iptio

n no

t use

d

Lithologic description from Palm Beach County Water Utilities Department (2003)

Dept

h, in

feet

be

low

land

sur

face

PB-1766 (W-17986; PBF-I2; site 17)LANDMSL: 12.05 feet

XCAL, in inches200

YCAL, in inches200

GR (spliced), in GAPI1500

CAL deep, in inches200

Lith

olog

y

Sonic DT, in µsec/ft60160 120

DPHI, in percent070

Flow

zone

0

100

200

300

400

500

600

700

800

900

1,000

1,100

1,200

1,300

1,400

1,500

1,600

1,700

1,800

1,900

2,000

2,100

2,200

2,300

Hydr

ogeo

logi

c un

it

Dept

h, in

feet

be

low

land

sur

face

Lithologic description from Florida Geological Survey for W-17986 at URLhttp://www.dep.state.fl.us/geology/gisdatamaps/litholog-temp.htm

Upper boundary for Avon Park sequence 1 from formation microresistivity image data collected in well PB-1841 at the same site

U.S. Department of the InteriorU.S. Geological Survey

Scientific Investigations Report 2014–5029Plate 1 of 3

Pamphlet accompanies map

By Ronald S. Reese and Kevin J. Cunningham

2014

Stratigraphic and Hydrogeologic Cross Sections A–A' Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government

This map was printed on an electronic plotter directly from digital files. Dimensional calibration may vary between electronic plotters and between X and Y directions on the same plotter, and paper may change size due to atmospheric conditions; therefore, scale and proportions may not be true on plots of this map.

For sale by U.S. Geological Survey, Information Services, Box 25286, Federal Center, Denver, CO 80225, 1–888–ASK–USGS

Digital files available at http://dx.doi.org/10.3133/sir20145029

Suggested Citation: Reese, R.S., and Cunningham, Kevin, 2014, Hydrogeologic framework and geologic structure of the Floridan aquifer system and intermediate confining unit in the Lake Okeechobee area, Florida: U.S. Geological Survey Scientific Investigations Report 2014–5029 [http://dx.doi.org/10.3133/sir20145029].

ISSN 2328-0328 (online)

Prepared in cooperation with Broward County, Florida