STRATIGRAPHY AND PROVENANCE OF CONGLOMERATE BEDS IN THE PUENTE FORMATION NEAR PUDDINGSTONE RESERVOIR,

EASTERN LOS ANGELES COUNTY, CALIFORNIA.

LOCATION MAP OF STUDY AREALOCATION MAP OF STUDY AREA

SANTA AN

A

MO

UN

TAINS

PUENTE HILLS

SAN JOSE H

ILLS

SAN GABRIEL MOUNTAINS

SAN BERNARDINO MOUNTAINS

ONTARIO

CORONA

CHINO VALLEY

POMONA

SANTA ANA

LOS ANGLES

PASADENA

LONG BEACH

SANTA

ANA

RIV

ER

SA

NG

ABR

IEL

RIVER

118° 30' 118° 00'

34° 15'

34° 00'

34° 30'117° 30' 117° 00'

33° 45'

117° 45'

SAN DIMAS

PACIFIC OCEAN

STUDY AREA

KEY:

Known middle to upper Miocene shoreline and mainland area of Miocene sediments (Woodford, 1946)

LOCATION MAP OF FRANK G BONELLI PARKLOCATION MAP OF FRANK G BONELLI PARK

1100

PuddingstoneReservoir

FRANK G BONELLIREGIONAL COUNTY

PARK

SHELTONS TYPE SECTION FOR EASTERN SAN JOSE HILLS

Red area represents the rocks found within the study are

GEOLOGIC MAP OF STUDY AREAGEOLOGIC MAP OF STUDY AREA

12001100

1000

1100

1000

PuddingstoneReservoir

3020

21

30

60

70

39

25

19

22

48

33

3449

41

4630

2021

33

24 30

29

28

20

5

30

35

15

25

17

19

39

A

B

A'

B'

A"

B"

TCg A

TCg A

TCg A

TCg C

TCg C

Tp

Tp

Tp

Tp

Tp

Tgv

Tgv

TCg C

ss

ss

ss

ss

ss

ss

ss

ss

ss

TCg B

ss

4020

10

40

38

16 18

302560

25

35

40

85D

U

Tgv

1

2

3

5

6

457 F

reew

ay

Via Verde Drive

Rag

ing

Wat

ers

Drive

LOCATION 1

LOCATION 2

LOCATION 3

LOCATION 4

LOCATION 5

LOCATION 6

1200 Ft.

1000 Ft.

1200 Ft.

1000 Ft.

CROSS SECTION A - A", ALONG HIGHWAY 57

N 56° W N 41° W

N 10° W N 31° W

A A' A"

B"B'B

1200 Ft.

1000 Ft.

800 Ft.

1200 Ft.

1000 Ft.

800 Ft.

800 Ft.

CROSS SECTION B - B", NEAR PUDDINGSTONE RESERVOIR

EXLPANATION

TCg A

TCg B

TCg C

Tgv

Puente Formation (T p): siltsones, sandstones and shalesSandstone (ss): mapable sandstone beds found in the Puente Formation.

Glendora Volcanics (Tgv): intermediate to felsic volcanics, breccias, flows, and agglomerates. 15 -16 Ma. (weigand, 1994; Nourse, 1998)

Conglomerate (TCg (C)): mostly basement clasts with minor amounts of volcanics depending on location. All found in sandy matrix.

Conglomerate TCg (B)): Mostly porphyritic andesite seprated by sandstone horizon. All in sandy matrix.

Conglomerate (TCg (A)): Mostly rhyolite to dacite. Found in well cemented sandy matrix.

Tp

ss

GEOLOGIC MAP OF BONELLI PARK NEAR PUDDINGSTONE RESERVOIR, CALIFORNIA

GEOLOGIC SYMBOLS

0 500 1000 ft

1 inch equals 500 feet. Or, 1 inch equals 150 meters. no vertical exaggeration

N14°

magnetic north declination, center of map

12001100

1000

1100

1000

PuddingstoneReservoir

3020

21

30

60

70

39

25

19

22

48

33

3449

41

4630

2021

33

24 30

29

28

20

5

30

35

15

25

17

19

39

A

B

A'

B'

A"

B"

TCg A

TCg A

TCg A

TCg C

TCg C

TC

g C

Tp

Tp

Tp

Tp

Tp

Tgv

Tgv

TCg C

ss

ss

ss

ss

ss

ss

ss

ss

ss

TCg A

ss

4020

10

40

38

1618

302560

25

35

40

85D

U

Tgv

150 m il es050

l ocat i on of study area

122° 120° 118° 116°

42°

40°

38°

36°

34°

CALIFORNIA

A B

25°

Strike and dip of beds

Syncline, with plunge direction, dashed where approximately located

Anticline, with plunge direction, dashed where approximately located

Contact

Contact where approximatly located

Fault, showing dip, dashed where approximately located

Park roads

Highways

Stream and Lake line locations

Conglomerate clast sampling locations

Cross section lines

U

D

Geology by: McLarty, Andrew H. and Nourse, Jonathan A. Department of geologic sciences, California State Polytechnic University. Pomona California. 2000.

1

1

2

3

5

6

4

1200 Ft.

1000 Ft.

1200 Ft.

1000 Ft.

CROSS SECTION A - A", ALONG HIGHWAY 57

N 56° W N 41° W

N 10° W N 31° W

A A' A"

B"B'B

1200 Ft.

1000 Ft.

800 Ft.

1200 Ft.

1000 Ft.

800 Ft.

800 Ft.

CROSS SECTION B - B", NEAR PUDDINGSTONE RESERVOIR

STRATIGRAPHY

PU

EN

TE

FO

RM

AT

ION

UP

PE

R M

IOC

EN

E -

LO

WE

R P

LIO

CE

NE

GLE

ND

OR

A V

OL.

KMz

Q

Th.Fm.Per. STRATIGRAPHIC SECTION DESCRIPTION

STRATIGRAPHIC SECTION, EASTERN PUENTE - SAN JOSE HILLS NEAR PUDDINGSTONE RESERVOIR

Conglomerate (TCg (C)): mostly basement clasts with abundant volcanic clasts in higest and lowest levels, all in sandy maxrix.

Puente Formation (Tp): siltstone, sandstone, and shale

Conglomerate (TCg (B)): Two beds with predominantly porphyritic andesite clasts separated by sandstone horizon, all in sandy matrix.

Puente Formation (Tp): siltstone, sandstone, and shale

Conglomerate (TCg (A)): Mostly rhyolite to dacite clasts, all in sandy maxrix.

Glendora Volcanics (Tgv): intermediate to felsic volcanic, breccias, flows, and agglomerates. 15 - 16 Ma. (Weigand et al, 1994; Nourse et al. 1998)

Basement complex (bc), late Cretaceous, quartz diorite / tonalite

Alluvium (Qal) and thick soil horizon.

100

- 1

55

Ft.

700

-14

00 F

t.1

00

-20

0 F

t.2

80

- 3

44

Ft.

100

-2

40

Ft.

787

- 3

49

7 F

t.

McLarty, 2000

OLIG

. Mountian Meadow dacite, 27 28 Ma (Hazelton, pers. comm.)

MID

DLE

MIO

CE

NE

STEREONET RESULTS

NEqual Area

Equal Area

N

Figure 5b. - poles to bedding of small fold found in the Puente Formation near south shoreline, Puddingstone Reservoir.

Figure 5a. - poles to bedding in Puente Formation south and west Puddingstone Reservoir.

conglomerate

sandstone

siltstone

KEY

Plunging fold axis : 235° / 3°SW

Plunging fold axis : 125° / 31°SE

Name of Clast Location 1 Location 2 Location 3 Location 4 Location 5 Location 6 Rhyolite - dacite 53.6 7 0 9.7 8.8 47.7 Porphyritic andesite 21.7 47.1 9.2 4 5.6 28.2 Aphanitic andesite 18.3 0 5.7 0 0 16.5 Basaltic andesite 6 6.4 0 0 0 6.8 Porphyritic basalts 0.4 0 0 0 0 0.8 Andesite 0 26.7 0 7.6 6.3 0 Flow banded rhyolite 0 9.3 0 3 4.8 0 Basalt - vasicular basalts 0 3.5 0 5.9 0 0 Agglomerate 0 0 0 10.7 0 0 Granitoids (granite, tonolite, aplite) 0 0 25.3 13.6 15.9 0 Diorite - gabbro 0 0 13.8 6.8 8 0 Quartzite 0 0 6.9 4.9 4.8 0 Gneiss 0 0 5.7 8.8 18.3 0 Amphiblite schist 0 0 0 0 1.3 0 Mylonite 0 0 33.4 25 26.2 0

total % 100 100 100 100 100 100N number of clasts collected 235 172 157 104 126 103

SUMMARY OF ALL CLAST COUNTS FROM SIX CONGLOMERATE BEDS IN THE SUMMARY OF ALL CLAST COUNTS FROM SIX CONGLOMERATE BEDS IN THE STUDY AREASTUDY AREA

PERCENT OF TOTAL CLASTS AT 6 CONGLOMERATE LOCATIONS

Abundance of Clasts at 6 Conglomerate Locations

0

15

30

45

Location 1 Location 2 Location 3 Location 4 Location 5 Location 6

Rhyolite - dacite Porphyritic andesite Aphanitic andesite

Basaltic andesite Porphyritic basalts Andesite

Flow banded rhyolite Basalt - vasicular basalts Agglomerate

Granitoids (granite, tonolite, aplite) Diorite - gabbro Quartzite

Gneiss Amphiblite schist agglomerate

Name of Clast location 1 location 2 location 3 location 4 location 5 location 6 Volcanics 100 100 14.9 40.9 25.5 100 Plutonics 0 0 39.1 20.4 23.9 0 Metamorphics 0 0 46 38.7 50.6 0

total % 100 100 100 100 100 100N number of clasts collected 235 172 157 104 126 103

SUMMARY OF ONLY VOLCANIC, PLUTONIC, AND METAMORPMIC CLAST SUMMARY OF ONLY VOLCANIC, PLUTONIC, AND METAMORPMIC CLAST COUNTS FROM SIX CONGLOMERATE BEDS IN STUDY AREACOUNTS FROM SIX CONGLOMERATE BEDS IN STUDY AREA

PERCENT OF TOTAL CLASTS AT 6 CONGLOMERATE LOCATIONS

Percent of total clasts at 6 conglomerate locations.

0

20

40

60

80

100

location 1 location 2 location 3 location 4 location 5 location 6

Locations within study area

Pe

rce

nt

of

tota

l c

las

ts c

ou

nte

d

Volcanics Plutonics Metamorphics

Location 1

0

5

10

15

20

25

30

35

40

45

50

55

Rhyolite -dacite

Porphyriticandesite

Aphaniticandesite

Basalticandesite

Porphyriticbasalts

Andesite Flowbandedrhyolite

Basalt -vasicularbasalts

Agglomerate

Granitoids(granite,tonolite,aplite)

Diorite -gabbro

Quartzite Gneiss Amphibliteschist

Mylonite

Clast lithologies

Pe

rce

nt

of

235

tota

l cla

sts

cou

nte

d

VOLCANICS PLUTONICS METAMORPHICS

Location 2

0

5

10

15

20

25

30

35

40

45

50

55

Rhyolite -dacite

Porphyriticandesite

Aphaniticandesite

Basalticandesite

Porphyriticbasalts

Andesite Flowbandedrhyolite

Basalt -vasicularbasalts

Agglomerate

Granitoids(granite,tonolite,aplite)

Diorite -gabbro

Quartzite Gneiss Amphibliteschist

Mylonite

Clasts lithologies

Per

cent

of 1

72 to

tal c

last

s co

unte

d VOLCANICS PLUTONICS METAMORPHICS

Location 3

0

5

10

15

20

25

30

35

40

45

50

55

Rhyolite -dacite

Porphyriticandesite

Aphaniticandesite

Basalticandesite

Porphyriticbasalts

Andesite Flowbandedrhyolite

Basalt -vasicularbasalts

Agglomerate

Granitoids(granite,tonolite,aplite)

Diorite -gabbro

Quartzite Gneiss Amphibliteschist

Mylonite

Clast lithologies

Per

cent

of 1

57 c

last

s co

unte

d

VOLCANICS PLUTONICS MEATMORPHICS

Location 4

0

5

10

15

20

25

30

35

40

45

50

55

Rhyolite -dacite

Porphyriticandesite

Aphaniticandesite

Basalticandesite

Porphyriticbasalts

Andesite Flowbandedrhyolite

Basalt -vasicularbasalts

Agglomerate

Granitoids(granite,tonolite,aplite)

Diorite -gabbro

Quartzite Gneiss Amphibliteschist

Mylonite

Clast lithologies

Per

cent

of 1

04 to

tal c

last

s co

unte

d VOLCANICS PLUTONICS MEATMORPHICS

Location 5

0

5

10

15

20

25

30

35

40

45

50

55

Rhyolite -dacite

Porphyriticandesite

Aphaniticandesite

Basalticandesite

Porphyriticbasalts

Andesite Flowbandedrhyolite

Basalt -vasicularbasalts

Agglomerate

Granitoids(granite,tonolite,aplite)

Diorite -gabbro

Quartzite Gneiss Amphibliteschist

Mylonite

Clast lithologies

Per

cent

of 1

26 to

tal c

last

s co

unte

d VOLCANICS PLUTONICS METAMORPHICS

Location 6

0

5

10

15

20

25

30

35

40

45

50

55

Rhyolite -dacite

Porphyriticandesite

Aphaniticandesite

Basalticandesite

Porphyriticbasalts

Andesite Flowbandedrhyolite

Basalt -vasicularbasalts

Agglomerate

Granitoids(granite,tonolite,aplite)

Diorite -gabbro

Quartzite Gneiss Amphibliteschist

Mylonite

Clast lithologies

perc

ent o

f 103

tota

l cla

sts

coun

ted VOLCANICS PLUTONICS METAMORPHICS

BLOCK DIAGRAM DURING RELIZIAN TIMEBLOCK DIAGRAM DURING RELIZIAN TIME

18 - 15 Ma.

N

W

BLOCK DIAGRAM DURING LUISIAN-MOHNIAN TIMEBLOCK DIAGRAM DURING LUISIAN-MOHNIAN TIME

N

W

Erosion and deposition of silt and mud from distal source.

15 - 11 Ma.

BLOCK DIAGRAM DURING LATE MIOCENE TIMEBLOCK DIAGRAM DURING LATE MIOCENE TIME

N

W

11 - 7 Ma.

Erosion and deposition of silt and mud from distal source.

BLOCK DIAGRAM DURING LATE MIOCENE-EARLY PLIOCENE TIMEBLOCK DIAGRAM DURING LATE MIOCENE-EARLY PLIOCENE TIME

N

W

Erosion and deposition of silt and mud from distal source.

7 - 4 Ma.

LOCATION MAP OF STUDY AREALOCATION MAP OF STUDY AREA

SANTA AN

A

MO

UN

TAINS

PUENTE HILLS

SAN JOSE H

ILLS

SAN GABRIEL MOUNTAINS

SAN BERNARDINO MOUNTAINS

ONTARIO

CORONA

CHINO VALLEY

POMONA

SANTA ANA

LOS ANGLES

PASADENA

LONG BEACH

SANTA

ANA

RIV

ER

SA

NG

ABR

IEL

RIVER

118° 30' 118° 00'

34° 15'

34° 00'

34° 30'117° 30' 117° 00'

33° 45'

117° 45'

SAN DIMAS

PACIFIC OCEAN

STUDY AREA

KEY:

Known middle to upper Miocene shoreline and mainland area of Miocene sediments (Woodford, 1946)

STRATIGRAPHY

PU

EN

TE

FO

RM

AT

ION

UP

PE

R M

IOC

EN

E -

LO

WE

R P

LIO

CE

NE

GLE

ND

OR

A V

OL.

KMz

Q

Th.Fm.Per. STRATIGRAPHIC SECTION DESCRIPTION

STRATIGRAPHIC SECTION, EASTERN PUENTE - SAN JOSE HILLS NEAR PUDDINGSTONE RESERVOIR

Conglomerate (TCg (C)): mostly basement clasts with abundant volcanic clasts in higest and lowest levels, all in sandy maxrix.

Puente Formation (Tp): siltstone, sandstone, and shale

Conglomerate (TCg (B)): Two beds with predominantly porphyritic andesite clasts separated by sandstone horizon, all in sandy matrix.

Puente Formation (Tp): siltstone, sandstone, and shale

Conglomerate (TCg (A)): Mostly rhyolite to dacite clasts, all in sandy maxrix.

Glendora Volcanics (Tgv): intermediate to felsic volcanic, breccias, flows, and agglomerates. 15 - 16 Ma. (Weigand et al, 1994; Nourse et al. 1998)

Basement complex (bc), late Cretaceous, quartz diorite / tonalite

Alluvium (Qal) and thick soil horizon.

100

- 1

55

Ft.

700

-14

00 F

t.1

00

-20

0 F

t.2

80

- 3

44

Ft.

100

-2

40

Ft.

787

- 3

49

7 F

t.

McLarty, 2000

OLIG

. Mountian Meadow dacite, 27 28 Ma (Hazelton, pers. comm.)

MID

DLE

MIO

CE

NE

1200 Ft.

1000 Ft.

1200 Ft.

1000 Ft.

CROSS SECTION A - A", ALONG HIGHWAY 57

N 56° W N 41° W

N 10° W N 31° W

A A' A"

B"B'B

1200 Ft.

1000 Ft.

800 Ft.

1200 Ft.

1000 Ft.

800 Ft.

800 Ft.

CROSS SECTION B - B", NEAR PUDDINGSTONE RESERVOIR

THE END