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/ofr20151232

Suggested Citation: Watt, J.T., Johnson, S.Y., and Sliter, R.W., 2015, Seismic-reflection profiles, Offshore of Pigeon Point map area, 

California, sheet 8 in Cochrane, G.R., Watt, J.T., Dartnell, P., Greene, H.G., Erdey, M.D., Dieter, B.E., Golden, N.E., Johnson, S.Y., Endris, 

C.A., Hartwell, S.R., Kvitek, R.G., Davenport, C.W., Krigsman, L.M., Ritchie, A.C., Sliter, R.W., Finlayson, D.P., and Maier, K.L. (G.R. 

Cochrane and S.A. Cochran, eds.), California State Waters Map Series—Offshore of Pigeon Point, California: U.S. Geological Survey 

Open-File Report 2015–1232, pamphlet 40 p., 10 sheets, scale 1:24,000, http://dx.doi.org/10.3133/ofr20151232.

ISSN 2331-1258 (online) 

http://dx.doi.org/10.3133/ofr20151232

Figure 10. Schematic map showing major offshore structural features northwest of Monterey Bay (modified 

from Nagel and others, 1986; McCulloch, 1987; Wagner and others, 2002; Dickinson, 2005). Red box, Offshore 

of Pigeon Point map area. Yellow line, offshore limit of California’s State Waters. Outer Santa Cruz Basin 

(modified from McCulloch, 1987) shown by blue shading and hachured lines (hachures point into basin). Solid 

black lines show traces of faults: AF, Ascension Fault (sawteeth on upper plate); CF, Coastways Fault; FF, 

Frijoles Fault; SGFZ, San Gregorio Fault Zone (also shown by dark-gray shading); SAF, San Andreas Fault; ZYF, 

Zayante-Vergeles Fault. Dashed magenta lines show axes of structural highs: PPH, Pigeon Point high; SCH, 

Santa Cruz high. Other abbreviations: PAN, Point Año Nuevo; PP, Pigeon Point.

122°30' 122°20' 122°10'

37°10'

37°0'

36°50'

Outer Santa Cruz Basin

PPH

SCH

AF

shelf-slope 

break

SGFZ

Monterey 

Bay

PAN

PP

CF

FF

0 5 10 Kilometers

ZVF

SAF

DISCUSSION

This map sheet shows seismic-reflection profiles from three different surveys of the Offshore of Pigeon Point map 

area, providing imagery of the subsurface geology. This map area is characterized by a relatively flat (less than 1°) 

inner and midshelf, extending to water depths of about 70 m at the limit of California’s State Waters. Most of the shelf 

north of Point Año Nuevo is covered by unconsolidated sandy and muddy sediment. Bedrock forms moderate-relief 

outcrops that locally extend from the shoreline to water depths of about 30 m, except offshore of Point Año Nuevo, 

where bedrock is exposed at the seafloor to water depths of greater than 40 m (sheets 1, 2, and 10). The seismicreflection profiles provide the data for interpreting subbottom stratigraphy, sediment thickness, and geologic structure 

(see sheets 9, 10).

Most profiles displayed on this sheet (figs. 1, 2, 3, 5, 6, 8, 9) were collected in 2009 and 2010 on U.S. Geological 

Survey (USGS) cruises S–N1–09–MB and S–15–10–NC, respectively. The single-channel seismic-reflection data were 

acquired using a SIG 2Mille minisparker that used a 500-J high-voltage electrical discharge fired 2 times per second, 

which, at normal survey speeds of 4 to 4.5 nautical miles per hour, gives a data trace every 1.0 to 1.5 m of lateral 

distance covered. The data were digitally recorded in standard SEG-Y 32-bit floating-point format, using Triton 

Subbottom Logger (SBL) software that merges seismic-reflection data with differential GPS-navigation data. After the 

survey, a short-window (20 ms) automatic gain control algorithm was applied to the data, along with a 160- to 

1,200-Hz bandpass filter and a heave correction that uses an automatic seafloor-detection window (averaged over 30 m 

of lateral distance covered). These data can resolve geologic features a few meters thick (hence, are considered 

“high-resolution”), down to subbottom depths of as much as 400 m.

Figures 4 and 7 show migrated, deep-penetration, multichannel seismic-reflection profiles collected in 1976 by 

WesternGeco on cruise W–14–76–SF. These profiles and other similar data were collected in many areas offshore of 

California in the 1970s and 1980s when these areas were considered a frontier for oil and gas exploration. Much of 

these data have been publicly released and are now archived at the USGS National Archive of Marine Seismic Surveys 

(U.S. Geological Survey, 2009). These data were acquired using a large-volume air-gun source that has a frequency 

range of 3 to 40 Hz and recorded with a multichannel hydrophone streamer about 2 km long. Shot spacing was about 

30 m. These data can resolve geologic features that are 20 to 30 m thick, down to subbottom depths of about 4 km.

Faults in the offshore part of the Offshore of Pigeon Point map area are identified in seismic-reflection profiles 

based on abrupt truncation or warping of reflections and (or) the juxtaposition of reflection panels with different 

seismic parameters, such as reflection presence, amplitude, frequency, geometry, continuity, and vertical sequence. The 

map area encompasses a part of the continental shelf that lies between the Ascension Fault and the San Gregorio Fault 

Zone, along the northeastern margin of the Outer Santa Cruz Basin and the southwest limb of the Pigeon Point high 

(McCulloch, 1987) (fig. 10). This map area is characterized by a number of steeply dipping, predominantly northweststriking, unnamed faults. These faults show a vertical separation of reflections and commonly juxtapose different 

reflection panels, suggesting a combination of reverse and strike-slip faulting. This faulting is associated with a 

complex pattern of folding, particularly within the Monterey Formation offshore Point Año Nuevo (see figs. 6, 8; see 

also, sheet 10). Rates of Pleistocene-age vertical uplift onshore, west of the San Gregorio Fault Zone, range from 0.31 

to 0.35 m/ka (Clark and others, 1999), and cumulative lateral slip on the San Gregorio Fault Zone is thought to range 

from 4 to 10 mm/yr in this area (Weber and others, 1995).

On high-resolution seismic-reflection profiles, the Upper Cretaceous Pigeon Point Formation is essentially 

nonreflective (figs. 1, 2, and 5). The overlying Tertiary strata are moderately to highly deformed, and are generally 

characterized by continuous, parallel to subparallel, variable amplitude, high-frequency reflections (terminology after 

Mitchum and others, 1977). Onshore west of the San Gregorio Fault Zone, the Tertiary section includes Oligocene and 

Miocene unnamed sedimentary and volcanic rocks, the middle and upper Miocene Monterey Formation, and the upper 

Miocene and Pliocene Purissima Formation (Powell and others, 2007; Brabb and others, 1998; Clark and others, 

1999). Whereas the Santa Cruz Mudstone is absent in the onshore sections, it is present in offshore wells within the 

Outer Santa Cruz Basin (Heck and others, 1990), and may also be present in the subsurface within the offshore part of 

the Offshore of Pigeon Point map area. 

Throughout the map area, the contact between Tertiary bedrock and overlying upper Quaternary sediments is an 

angular unconformity. These unconsolidated sediments were deposited in the last about 21,000 years during the 

sea-level rise following the Last Glacial Maximum (LGM; Lambeck and Chappell, 2001; Peltier and Fairbanks, 2006). 

Sea level was about 125 m lower during the LGM, at which time the Offshore of Pigeon Point map area was emergent. 

The post-LGM sea-level rise was rapid (about 9 to 11 m per thousand years) until about 7,000 years ago, when it 

slowed considerably to about 1 m per thousand years (Peltier and Fairbanks, 2006; Stanford and others, 2011). 

Sediments deposited during the post-LGM sea-level rise (the rapid transgression and post-about 7 ka highstand) are 

shaded blue in the high-resolution seismic-reflection profiles (figs. 1, 2, 3, 5, 6, 8, and 9); the combined thickness of 

this unit, and another upper Quaternary unit not present in this map area, are shown on sheet 9 (Maps B, D).

REFERENCES CITED

Brabb, E.E., Graymer, R.W., and Jones, D.L., 1998, Geology of the onshore part of San Mateo County, California—A 

digital database: U.S. Geological Survey Open-File Report 98–137, scale 1:62,500, available at 

http://pubs.usgs.gov/of/1998/of98-137/.

Clark, J.C., Weber, G.E., Rosenberg, L.I., and Burnham, K., 1999, Neotectonics of the San Gregorio fault zone, central 

coastal California, Field Trip No. 2, in Garrison, R.E., Aiello, I.W., and Moore, J.C., eds., Late Cenozoic fluid 

seeps and tectonics along the San Gregorio Fault Zone in the Monterey Bay Region, Pacific Section, American 

Association of Petroleum Geologists Guidebook GB-76, p. 94–119.

Dickinson, W.R., Ducea, M., Rosenberg, L.I., Greene, H.G., Graham, S.A., Clark, J.C., Weber, G.E., Kidder, S., Ernst, 

W.G., and Brabb, E.E., 2005, Net dextral slip, Neogene San Gregorio–Hosgri fault zone, coastal CaliforniaGeologic evidence and tectonic implications: Geological Society of America Special Paper 391, 43 p.

Heck, R.G., Edwards, E.B., Kronen, J.D., Jr., and Willingham, C.R., 1990, Petroleum potential of the offshore outer 

Santa Cruz and Bodega basins, California, in Garrison, R.E., Greene, H.G., Hicks, K.R., Weber, G.E., and Wright, 

T.L., eds. Geology and tectonics of the central California coastal region, San Francisco to Monterey: American 

Association of Petroleum Geologists, Pacific Section, Bulletin GB67, p. 143–164. 

Lambeck, K., and Chappell, J., 2001, Sea level change through the last glacial cycle: Science, v. 292, p. 679–686, 

doi:10.1126/science.1059549.

McCulloch, D.S., 1987, Regional geology and hydrocarbon potential of offshore central California, in Scholl, D.W., 

Grantz, A., and Vedder, J.G., eds., Geology and resource potential of the continental margin of western North 

America and adjacent ocean basins—Beaufort Sea to Baja California: Circum-Pacific Council for Energy and 

Mineral Resources Earth Science Series, v. 6, p. 353–401.

Mitchum, R.M., Jr., Vail, P.R., and Sangree, J.B., 1977, Seismic stratigraphy and global changes of sea level, part 

6—Stratigraphic interpretation of seismic reflection patterns in depositional sequences, in Payton, C.E., ed., 

Seismic stratigraphy—Applications to hydrocarbon exploration: Tulsa, Okla., American Association of Petroleum 

Geologists, p. 117–133.

Nagel, D.K, Mullins, H.T., and Greene, H.G., 1986, Ascension submarine canyon, California—Evolution of a multihead canyon system along a strike-slip continental margin: Marine Geology, v. 73, p. 295–310.

Peltier, W.R., and Fairbanks, R.G., 2006, Global glacial ice volume and Last Glacial Maximum duration from an 

extended Barbados sea level record: Quaternary Science Reviews, v. 25, p. 3,322–3,337.

Powell, C.L., II, Barron, J.A., Sarna-Wojcicki, A.M., Clark, J.C., Perry, F.A., Brabb, E.E., and Fleck, R.J., 2007, Age, 

stratigraphy, and correlations of the late Neogene Purisima Formation, central California Coast Ranges: U.S. 

Geological Survey Professional Paper 1740, 32 p., available at http://pubs.usgs.gov/pp/2007/1740/.

Stanford, J.D., Hemingway, R., Rohling, E.J., Challenor, P.G., Medina-Elizalde, M., and Lester, A.J., 2011, Sea-level 

probability for the last deglaciation—A statistical analysis of far-field records: Global and Planetary Change, v. 

79, p. 193–203, doi:10.1016/j.gloplacha.2010.11.002.

U.S. Geological Survey, 2009, National Archive of Marine Seismic Surveys: U.S. Geological Survey database, 

accessed April 5, 2011, at http://walrus.wr.usgs.gov/NAMSS/.

Wagner, D.L., Greene, H.G., Saucedo, G.J., and Pridmore, C.L., 2002, Geologic map of the Monterey 30' × 60' 

quadrangle and adjacent areas, California: California Geological Survey Regional Geologic Map Series, scale 

1:100,000, available at http://www.quake.ca.gov/gmaps/RGM/monterey/monterey.html.

Weber, G.E., Nolan, J.M., and Zinn, E.N., 1995, Determination of late Pleistocene-Holocene slip rates along the San 

Gregorio fault zone, San Mateo and Santa Cruz Counties, California—Final Technical Report: National Earthquake Hazard Reduction Program, Final Technical Report, Contract No. 1434–93–G–2336, 70 p., 4 sheets.

37°

36°40'

122°20' 122°

Santa Cruz

Monterey

Moss 

Landing

Pigeon

Point

Limit of California’s

State Waters

Area of

Map

CALIF.

MAP LOCATION

0 5 10 Kilometers

0 5 10Nautical Miles

121°40'

Monterey

Bay

Seismic-Reflection Profiles, Offshore of Pigeon Point Map Area, 

California

By

Janet T. Watt, Samuel Y. Johnson, and Ray W. Sliter

2015

1 km

VERTICAL EXAGGERATION ~ 12.5 SOUTHWEST NORTHEAST

Monterey Formation Frijoles Purisima Formation 

 Fault

Two-way travel time, in seconds

0

0.2

0.1

0.3

160

0 

Approximate depth, in meters

80

240

Figure 9. USGS High-resolution minisparker seismic-reflection profile MBS–33 (collected in 2009 on survey S–N1–09–MB), which crosses shelf southwest of Point Año Nuevo; see trackline map for location. Profile 

highlights faulted and folded strata beneath continental shelf. Dashed red lines show faults. Magenta symbol shows fold axis (diverging arrows, anticline). Frijoles fault is imaged juxtaposing Monterey Formation to 

southwest with Purisima Formation to northeast. Blue shading shows inferred uppermost Pleistocene and Holocene strata, deposited since last sea-level lowstand about 21,000 years ago. Underlying reflectors 

image deformed Tertiary strata. Dashed blue line shows unconformity. Dashed green lines highlight some continuous reflections that reveal structure (not distinctive stratigraphic markers). Dashed yellow line is 

seafloor multiple (echo of seafloor reflector). Purple triangle shows location of California’s State Waters limit (yellow line on trackline map). 

1 km

VERTICAL EXAGGERATION ~ 12.5

Two-way travel time, in seconds

0

0.2

0.1

0.3

SOUTHWEST

Fig. 3

NORTHEAST

160

0 

Approximate depth, in meters

80

240

Figure 8. USGS high-resolution minisparker seismic-reflection profile P10–38 (collected in 2010 on survey S–15–10–NC), which crosses shelf northwest of Año Nuevo Island; see trackline map for location. Profile highlights 

faulted and folded strata beneath continental shelf. Dashed red line shows fault. Magenta symbols show fold axes (diverging arrows, anticlines; converging arrows, synclines). Blue shading shows inferred uppermost 

Pleistocene and Holocene strata, deposited since last sea-level lowstand about 21,000 years ago. Underlying reflectors image deformed Tertiary strata. Dashed green lines highlight some continuous reflections that reveal 

structure (not distinctive stratigraphic markers). Dashed yellow line is seafloor multiple (echo of seafloor reflector).

VERTICAL EXAGGERATION ~2

1 km

SOUTHWEST NORTHEAST

1.0

Two-way travel time, in seconds

2.0

0 0 

Approximate depth, in kilometers

1

 2

Fig. 3

Figure 7. Migrated, deep-penetration industry, 2-D, multichannel air-gun seismic-reflection profile WSF-040 (collected in 1976 on survey W–14–76–SF; from USGS National Archive of Marine 

Seismic Surveys [U.S. Geological Survey, 2009]), which crosses shelf west of Point Año Nuevo; see trackline map for location. Note that vertical scale and exaggeration are significantly 

different than that of high-resolution profiles shown in figures 1, 2, 3, 5, 6, 8, and 9. Profile highlights multiple faults (dashed yellow lines) beneath the continental shelf, including the 

Ascension Fault located southwest of map area (see fig. 10 for location). Magenta symbols show fold axes (diverging arrows, anticlines; converging arrows, synclines). Purple triangle 

shows location of California’s State Waters limit (yellow line on trackline map). Green triangle shows location of map boundary.

Ascension Fault 

1 km

VERTICAL EXAGGERATION ~ 12.5

Two-way travel time, in seconds

0

0.2

0.1

0.3

SOUTHWEST

Fig. 3

NORTHEAST

Monterey Formation

160

0 

Approximate depth, in meters

80

240

Figure 6. USGS high-resolution minisparker seismic-reflection profile P10–20 (collected in 2010 on survey S–15–10–NC), which crosses shelf northwest of Año Nuevo Island; see trackline 

map for location. Profile highlights faulted and folded strata beneath continental shelf. Dashed red lines show faults. Magenta symbols show fold axes (diverging arrows, anticlines; 

converging arrows, synclines). Blue shading shows inferred uppermost Pleistocene and Holocene strata, deposited since last sea-level lowstand about 21,000 years ago. Underlying 

reflectors image deformed Tertiary strata, including the Monterey Formation, which is exposed on the seafloor. Dashed blue line shows unconformity. Dashed green lines highlight some 

continuous reflections that reveal structure (not distinctive stratigraphic markers). Dashed yellow line is seafloor multiple (echo of seafloor reflector). Purple triangle shows location of 

California’s State Waters limit (yellow line on trackline map).

1 km

VERTICAL EXAGGERATION ~ 12.5

Two-way travel time, in seconds

0

0.2

0.1

0.3

SOUTHWEST

Fig. 3

NORTHEAST

Zone of hummocky reflectors

160

0 

Approximate depth, in meters

80

240

Figure 5. USGS high-resolution minisparker seismic-reflection profile P10–25 (collected in 2010 on surveys S–15–10–NC), which crosses shelf south of Pigeon Point; see trackline map for 

location. Profile highlights faulted and folded strata beneath continental shelf. Dashed red lines show faults. Magenta symbols show fold axes (diverging arrows, anticline; converging 

arrows, synclines). Blue shading shows inferred uppermost Pleistocene and Holocene strata, deposited since last sea-level lowstand about 21,000 years ago. Underlying reflectors image 

deformed Tertiary and Cretaceous strata. Dashed blue lines show unconformities. Note zone of hummocky reflectors between otherwise parallel to subparallel reflectors near middle of 

profile (see cross-line, fig. 3). Dashed green lines highlight some continuous reflections that reveal structure (not distinctive stratigraphic markers). Dashed yellow line is seafloor multiple 

(echo of seafloor reflector). Purple triangle shows location of California’s State Waters limit (yellow line on trackline map).

“nonreflective”

Pigeon Point Formation

1.0

Two-way travel time, in seconds

2.0

0

VERTICAL EXAGGERATION ~2

1 km

0 

Approximate depth, in kilometers

1

> 2

SOUTHWEST NORTHEAST

Figure 4. Migrated, deep-penetration industry, 2-D, multichannel air-gun seismic-reflection profile WSF–042 (collected in 1976 on survey W–14–76–SF; 

from USGS National Archive of Marine Seismic Surveys [U.S. Geological Survey, 2009]), which cross shelf west of Pigeon Point; see trackline map for 

location. Note that vertical scale and exaggeration are significantly different than that of high-resolution profiles shown in figures 1, 2, 3, 5, 6, 8, and 9. 

Dashed yellow lines show a number of unnamed faults. Magenta symbols show fold axes (diverging arrows, anticlines; converging arrows, synclines). 

Purple triangle shows location of California’s State Waters limit (yellow line on trackline map). Green triangle shows location of map boundary.

1 km

VERTICAL EXAGGERATION ~ 12.5

Two-way travel time, in seconds

0

0.2

0.1

0.3

NORTHWEST

Fig. 2Fig. 5

Fig. 6

Fig. 8

SOUTHEAST

Zone of hummocky reflectors

Fig. 7

160

0 

Approximate depth, in meters

80

240

Figure 3. USGS high-resolution minisparker seismic-reflection profile P10–39 (collected in 2010 on survey S–15–10–NC), which crosses shelf southwest of Pigeon Point; see 

trackline map for location. Profile highlights faulted and folded strata beneath continental shelf. Dashed red lines show faults. Magenta symbols show fold axes (diverging arrows, 

anticlines; converging arrows, synclines). Blue shading shows inferred uppermost Pleistocene and Holocene strata, deposited since last sea-level lowstand about 21,000 years 

ago. Underlying reflectors image variably deformed Tertiary and Cretaceous strata. Dashed blue lines show unconformities. Note zone of hummocky reflectors between otherwise 

parallel to subparallel reflectors (see cross-line, fig. 5). Dashed green lines highlight some continuous reflections that reveal structure (not distinctive stratigraphic markers). 

Dashed yellow line is seafloor multiple (echo of seafloor reflector).

1 km

VERTICAL EXAGGERATION ~ 12.5

Two-way travel time, in seconds

0

0.2

0.1

0.3

SOUTHWEST

Fig. 3

NORTHEAST

160

0 

Approximate depth, in meters

80

240

Figure 2. USGS high-resolution minisparker seismic-reflection profile P10–35 (collected in 2010 on survey S–15–10–NC), which cross shelf west of Pigeon Point; see trackline map for 

location. Profile highlights faulted and folded strata along the northeast margin of the Outer Santa Cruz Basin (see fig. 10 for location). Dashed red lines show faults. Magenta symbol 

shows fold axis (converging arrows, syncline). Blue shading shows inferred uppermost Pleistocene and Holocene strata, deposited since last sea-level lowstand about 21,000 years 

ago. Underlying reflectors image deformed Tertiary and Cretaceous strata. Dashed blue lines show unconformities. Dashed green lines highlight some continuous reflections that 

reveal structure (not distinctive stratigraphic markers). Dashed yellow line is seafloor multiple (echo of seafloor reflector).

“nonreflective”

Pigeon Point Formation

Two-way travel time, in seconds

0

0.2

0.1

0.3

1 km

VERTICAL EXAGGERATION ~ 12.5 SOUTHWEST NORTHEAST

160

0 

Approximate depth, in meters

80

240

Figure 1. USGS high-resolution minisparker seismic-reflection profile P10–35 (collected in 2010 on survey S–15–10–NC), which crosses shelf northwest of Pigeon Point; see trackline map for location. 

Profile highlights faulted and folded strata along the northeast margin of the Outer Santa Cruz Basin (see fig. 10 for location). Dashed red lines show faults. Magenta symbols show fold axes (diverging 

arrows, anticlines; converging arrows, syncline). Blue shading shows inferred uppermost Pleistocene and Holocene strata, deposited since last sea-level lowstand about 21,000 years ago. Underlying 

reflectors image deformed Tertiary and Cretaceous strata. Dashed blue lines show unconformities. Dashed green lines highlight some continuous reflections that reveal structure (not distinctive 

stratigraphic markers). Dashed yellow line is seafloor multiple (echo of seafloor reflector). Purple triangle shows location of California’s State Waters limit (yellow line on trackline map). 

Pigeon Point Formation

ONE MILE = 0.869 NAUTICAL MILES

1 0.5 0 1 KILOMETER

7000 3500 0 7000 FEET

2 1 0 2 MILES

SCALE 1:50 000

APPROXIMATE MEAN

DECLINATION, 2015

MAGNETIC NORTH

13 / ° 1 2

TRUE NORTH

GIS database and digital cartography by Janet T. Watt, 

Stephen R. Hartwell, and Peter Dartnell

Manuscript approved for publication December 4, 2015

Onshore elevation data from California Coastal 

Conservancy (available from National Oceanic and 

Atmospheric Administration [NOAA] Coastal Service 

Center’s Digital Coast at http://www.csc.noaa.gov/

digitalcoast/data/coastallidar/) and from U.S. Geological 

Survey’s National Elevation Dataset (available at 

http://ned.usgs.gov/). California's State Waters limit from 

NOAA Office of Coast Survey

Universal Transverse Mercator projection, Zone 10N

NOT INTENDED FOR NAVIGATIONAL USE

122°20'

122°20'

122°25'

122°25'

37°10'

37°10'

37°05' 37°05'

Trackline Map

EXPLANATION

Tracklines of select seismic-reflection 

surveys—Thick lines show locations 

of profile lines depicted in figures; 

thin lines show full extent of surveys

Survey S–15–10–NC (USGS)

Survey W–14–76–SF (WesternGeco)

3-nautical-mile limit of California’s State 

Waters

Area of “no data”—Areas near shoreline 

not mapped owing to insufficient 

high-resolution seafloor mapping 

data; areas beyond the 3-nautical-mile 

limit of California’s State Waters were 

not mapped as part of the California 

Seafloor Mapping Program

Figure 2

Figure 4

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Fig. 9

Pigeon

Point

Franklin

Point

Point

Año Nuevo

Año Nuevo

Island

Open-File Report 2015–1232

Sheet 8 of 10

Pamphlet accompanies map

U.S. Department of the Interior

U.S. Geological Survey