400

200

200

400

600

800

1,000

1,200

Sea level

METERS

SOUTH

F

1,000

500

1,500

2,500

3,000

3,500

2,000

500

1,000

Sea level

FEET

NORTH

F'

Atlantic Ocean

Section

A–A'

Basement

San Sebastián Formation

Lares Limestone

Cibao Formation

Aguada Limestone

Aymamón Limestone

NC-8

(projected) Quebrada Arenas Limestone-Río Indio Limestone

Qu

Qu

Qu

Qu

NC-2

Mucarabones Sand

400

200

200

400

600

800

Sea level

METERS

SOUTH

E

1,000

500

1,500

2,500

2,000

500

1,000

Sea level

FEET

NORTH

E'

Atlantic Ocean

Section

A–A'

Basement

San Sebastián Formation

Lares Limestone

Mucarabones Sand

Cibao Formation

Aguada Limestone

Aymamón Limestone

NC-14

(projected)

Mudstone unit

Quebrada Arenas

Limestone

Río Indio- Quebrada Arenas

Limestone, undifferentiated

Qu

Qu NC-4

600

400

200

200

400

600

800

Sea level

METERS

SOUTH

C

1,500

1,000

1,000

2,000

1,500

1,500

500

500

Sea level

FEET

NORTH

C'

Río Camuy

Atlantic Ocean

Section

A–A'

Quebradillas Limestone

Qu

Basement

San Sebastián Formation

Lares Limestone

Montebello Limestone

Cibao Formation

Aguada Limestone

Aymamón Limestone

NC-6

400

200

200

400

600

800

1,000

1,200

1,400

1,600

1,800

2,000

Sea level

METERS

SOUTH

D

1,000

500

1,500

2,500

2,000

3,000

3,500

4,000

4,500

5,000

5,500

6,000

6,500

500

1,000

Sea level

FEET

NORTH

D'

Atlantic Ocean

Section

A–A'

Quebradillas Limestone

Basement

San Sebastián Formation

Lares Limestone

Montebello Limestone

Cibao Formation

Aguada Limestone

Aymamón Limestone

4CPR

(projected)

NC-10

(projected) NC-5

Qu

Qu Qs

"San Sebastían"

(Briggs, 1961)

Lower "Lares"

(Briggs, 1961)

?

?

?

Qu

Section

A–A'

400

200

200

400

600

800

Sea level

METERS

SOUTH

B

1,000

1,000

2,000

1,500

2,500

500

Sea level

FEET

NORTH

B'

500

NC-11 Aymamón Limestone

San Sebastián Form

Cibao Formation

Aguada Limestone

ation

Guajataca Member

Basement

Lares Limestone

Quebradillas

Limestone Qu

Qu

Qb

Atlantic Ocean

A

Aguada Lim

ymamón Limestone

Cibao Formation

estone  

San Sebastián Formation

Montebello Limestone

Lares Limestone

Mudstone unit

Mucarabones Sand

Basement

Río Indio-Quebrada Arenas Limestone, undifferentiated

Tq Qu Tq Qa Tq QuTa Tq Qu Tq Tq Qu Tq Qu Tq Qu Qa Qs Qu Ta Qu Ta Qu Ta Qu Ta Qa Ta Qu Ta Qs Qu

Qs

Qs Qa Qs Qu Qa Qs Qs Qa Qs Qaf Qa Qaf Qa Qaf Qa Qaf

Qs

Qs

Río Guajataca

Río Camuy

Río Grande de Arecibo

Río Grande de Manatí

lagoon

lagoon

Río Indio

Río de la Plata

Río de Bayamón

Río San Juan

lagoon

canal

river

lagoon

Atlantic Ocean

NC-11 NC-6 NC-5

IAS-1 NC-14 NC-9 NC-2 NC-13 NC-1 NC-3 NC-12

Section

B–B'

Section

C–C'

Section

D–D'

Section

E–E'

Section

F–F'

0 5 10 20 KILOMETERS

0 5 10 MILES

15

500

Sea level

500

3,000

2,000

1,000

Sea level

1,000

FEET

EAST

METERS A'

WEST

A

VERTICAL EXAGGERATION X 8.1

EXPLANATION

Age Depositional environments and lithofacies

PLIOCENE

MIDDLE MIOCENE

EARLY MIOCENE

LATE OLIGOCENE

"MIDDLE" OLIGOCENE

EARLY TERTIARYCRETACEOUS

Outer to middle neritic limestone

Inner to middle neritic limestone

 and dolomite

Inner to middle neritic mixed siliciclastic

 and carbonate rocks

Inner to middle neritic limestone

 and dolomite

Nonmarine to inner neritic siliciclastic

 sandstone, mudstone, conglomerate

 with limestone

Volcanic rock, volcaniclastic sandstone

 and conglomerate, metavolcanic rock,

 sedimentary rocks

Middle- to outer-neritic mudstone

Marine and non-marine siliciclastic

 sandstone, mudstone and

 conglomerate

Middle to inner neritic clays, sandstone,

 marl

Middle to outer neritic mudstone

AGE

HOLOCENE

PLEISTOCENE

PLIOCENE

LATE

MIDDLE

EARLY

LATE

"MIDDLE"

EOCENE

PALEOCENE

CRETACEOUS

OLIGOCENE MIOCENE

Rock-stratigraphic unit

Alluvial deposits

Undifferentiated

surficial deposits

Quebradillas Limestone

Aymamón Limestone

Aguada (Los Puertos) Limestone

Undifferentiated Cibao Formation

Montebello

Limestone Member

Mudstone

unit

Quebrada Arenas and Río Indio

Limestone Members

Lares Limestone Mucarabones

Sand

San Sebastián Formation

Undifferentiated

Culebrinas

Río

Río Grande de Añasco

Río

Guajataca

Lago Guajataca

Río

Camuy

Río

Tanamá

Lago

Dos

Bocas

Lago

Caonillas

Río

Grande

de

Arecibo

Río

Grande

de

Manatí

Laguna

Tortuguero Río

Indio

Río

Cibuco

Río

Lago de

la Plata

de

la

Plata

Río

de

Bayamón

Bahai de San Juan

Laguna La

Torrecilla

Laguna de

Pinoñes

Río Piedras

Laguna

San José

Lago las

Curias

Lago de

Loíza

Río

Grande

de

Loíza

Río

Herrera

Río

Grande

Río Espíritu

Santo

A T L A N T I C O C E A N

Punta Vacía

Talega

Isla de

Cabra

Punta

Salinas

Puerto

Nueve

Punta

Peñon

Punta

Higuero

RICÓN AGUADA

AÑASCO

MOCA

AQUADILLA

ISABELA

SAN SEBASTIAN

QUEBRADILLAS

CAMUY

LARES

HATILLO

UTUADO

ARECIBO

CIALES

FLORIDA

BARCELONETA

MANATÍ

JAYUYA

MOROVIS

VEGA

BAJA

VEGA

ALTA

COROZAL

DORADO

TOA

ALTA

NARANJITO

TOA

BAJA

BAYAMÓN

AGUAS BUENAS

G

UAYNABO

CAGUAS

SAN

JUAN

CATANO

TRUJILLO

ALTO

CAROLINA

GURABO CANOVANAS

LOÍZA

RÍO

GRANDE

NAGUABO

Ciales

Florida

Morovis

Aguadilla

Moca

Rincón

Aguada

Quebradillas

Camuy

Lares

San Sebastían

Arecibo

Barceloneta

Vega Alta

Vega Baja

San Juan

Bayamón

Canóvanas

Río Piedras

Carolina

NC-11

NC-6

NC-10

4CPR

NC-5

IAS-1

NC-4

NC-14

NC-9 NC-2

NC-13

NC-1

NC-3

NC-12 A'

A

B'

B

C'

C

D

D' E'

E

F

F'

NC-8

0 5 10 20 KILOMETERS

0 5 10 MILES

15

67°00' 66°30' 66°00' 65°45'

18°30'

66°45' 66°15'

18°15'

67°15'

Base modified from U.S. Geological Survey 1:100,000 quadrangles:

Arecibo, 1980, unpublished, and Humacao, 1979, unpublished

















































































































































































  

 



 



   









Qa Qa

Qa

Qa

Culebrinas

Río

Río Grande de Añasco

Río

Guajataca

Lago Guajataca

Río

Camuy

Río

Tanamá

Lago

Dos

Bocas

Lago

Caonillas

Río

Grande

de

Arecibo

Río

Grande

de

Manatí

Laguna

Tortuguero Río

Indio

Río

Cibuco

Río

Lago de

la Plata

de

la

Plata

Río

de

Bayamón

Bahai de San Juan

Laguna La

Torrecilla

Laguna de

Pinoñes

Río Piedras

Laguna

San José

Lago las

Curias

Lago de

Loíza

Río

Grande

de

Loíza

Río

Herrera

Río

Grande

Río Espíritu

Santo

A T L A N T I C O C E A N

Punta Vacía

Talega

Isla de

Cabra

Punta

Salinas

Puerto

Nueve

Punta

Peñon

Punta

Higuero

RICÓN AGUADA

AÑASCO

MOCA

AQUADILLA

ISABELA

SAN SEBASTIAN

QUEBRADILLAS

CAMUY

LARES

HATILLO

UTUADO

ARECIBO

CIALES

FLORIDA

BARCELONETA

MANATÍ

JAYUYA

MOROVIS

VEGA

BAJA

VEGA

ALTA

COROZAL

DORADO

TOA

ALTA

NARANJITO

TOA

BAJA

BAYAMÓN

AGUAS BUENAS

G

UAYNABO

CAGUAS

SAN

JUAN

CATANO

TRUJILLO

ALTO

CAROLINA

GURABO CANOVANAS

LOÍZA

RÍO

GRANDE

NAGUABO

Ciales

Florida

Morovis

Aguadilla

Moca

Rincón

Aguada

Quebradillas

Camuy

Lares

San Sebastían

Arecibo

Barceloneta

Vega Alta

Vega Baja

San Juan

Bayamón

Canóvanas

Río Piedras

Carolina

Qu

Tq

Tq

Ta

Tal

Tcg

Ts

Ts

Qu

Qu

Ta

Ta

Tal

Tc

Tm

Tlf

Ts

Qs

Qu

Qu

Ta

Ta

Tal Tal

Tc Tc

Tm

Tlf Tms

Tr

Qs

Ta Qu

Ts

Tlf

Ts

Tqa

Tms

Qb

Qb Qaf Qs

Qb

Qu

Qa

Qa

Qa

Qa

Qa Qa

Qa

Tc

Tc

Tc

Qu

Qu

Qu

Tc

Tc

Tc

Tc

Tc

Qa

Qa

Qa

Qa

Qa

Qb

Qb

Qb

Qb

Qb

Qb Qb

Qb

Qb

Qb

Qb

Qb

Qb

Qs

Qs

Qs Qs

Qs

Qs

Qs

Qs

Qs

Qs

Qs

Qs

Tq

Tq Tq

Tq

Qu

Qu

Qu

Qu

Qu

Qu

Qu

Qu Ta

Ta

Ta Ta

Ta

Ta Ta

Ta

Tal Tal Tal

Tal

Ts

Ts Ts

Ts

Ts

Ts

Ql

Ql

Ql

Ql

Ql

Ql

Ql

Qaf

Qaf

Qaf

Qaf

NC-11

NC-6

NC-10

4CPR

NC-5

IAS-1

NC-4

NC-14

NC-9 NC-2

NC-13

NC-1

NC-3

NC-12 A'

A

B'

B

C'

C

D

D' E'

E

F

F'

NC-8

0 5 10 20 KILOMETERS

0 5 10 MILES

15

67°00' 66°30' 66°00' 65°45'

18°30'

66°45' 66°15'

18°15'

67°15'

Base modified from U.S. Geological Survey 1:100,000 quadrangles:

Arecibo, 1980, unpublished, and Humacao, 1979, unpublished

EXPLANATION

Quaternary deposits

 Alluvium

 Landslide deposits

 Beach deposits

 Swamp, marsh deposits

 Artificial fill

 Undifferentiated surficial deposits

Pliocene and Miocene rocks

 Quebradillas Limestone









 



Miocene rocks

 Aymamón Limestone

 Aguada (Los Puertos) Limestone



 Cibao Formation

 Montebello Limestone Member

 Quebrada Arenas Limestone Member—

 Includes Miranda Sand Member

 Río Indio Limestone Member—Includes

 Almirante Sur Lentil

 Guajataca Member

Miocene and Oligocene rocks

 Mucarabones Sand

 Lares Formation

 San Sebastián Formation

Line of hydrogeologic section

Southern extent of rocks of Middle Oligocene to Pliocene age

Contact

Well control point and number

Qa

Ql

Qb

Qs

Qaf

Qu

Tq

Ta

Tal

Tc

Tm

Tqa

Tr

Tcg

Tms

Tlf

Ts

NC-11

A A'

Isla

Mona

Isla de

Culebra

Isla de

Vieques

St.

Thomas

St.

 John

St. Croix

Puerto Rico

C A R I B B E A N S E A

A T L A N T I C O C E A N

North Coast ground-water province

MAP AREA

0 5 10 20 KILOMETERS

0 5 10 MILES

15

VERTICAL SCALES OF ALL SECTIONS EXAGGERATED

NATIONAL GEODETIC VERTICAL DATUM OF 1929

RAKE SCALE BELOW APPLIES TO SECTIONS B–B' THROUGH F–F'

CROSS SECTIONS CONSTRUCTED TO COMPLY WITH GEOLOGIC MAP OF W.H. MONROE (1980)

U.S. DEPARTMENT OF THE INTERIOR

U.S. GEOLOGICAL SURVEY

PROFESSIONAL PAPER 1419

Geologic map and sections of the North Coast Limestone aquifer system—PLATE 4

Renken, Robert A., and others, 2002, Geology and hydrogeology of the Caribbean Islandsaquifer system of the Commonweatlh of Puerto Rico and the U.S. Virgin Islands

GEOLOGIC MAP AND SECTIONS SHOWING PRINCIPAL STRATIGRAPHIC UNITS, DEPOSITIONAL ENVIRONMENTS AND

LITHOFACIES OF ROCKS OF OLIGOCENE TO PLIOCENE AGE IN THE NORTH COAST LIMESTONE AQUIFER SYSTEM

By

W.C. Ward, R.A. Scharlach, and J.R. Hartley

2002