Dataset Identification:
Resource Abstract:
- description: This part of SIM 3261 presents data for the geologic and geomorphic map (see sheet 10, SIM 3261) of the Offshore
of Carpinteria map area, California. The vector data file is included in "Geology_OffshoreCarpinteria.zip," which
is accessible from http://pubs.usgs.gov/ds/781/OffshoreCarpinteria/data_catalog_OffshoreCarpinteria.html. The offshore part
of the map area largely consists of a relatively shallow (less than about 45 m deep), gently offshore-dipping (less than 1
degree) shelf underlain by sediments derived primarily from relatively small coastal watersheds that drain the Santa Ynez
Mountains. Shelf deposits are primarily sand (unit Qms) at depths less than about 25 m and, at depths greater than about 25
m, are the more fine-grained sediments (very fine sand, silt, and clay) of unit Qmsf. The boundary between units Qms and Qmsf
is based on observations and extrapolation from sediment sampling (see, for example, Reid and others, 2006) and camera ground-truth
surveying (see sheet 6). It is important to note that the boundary between units Qms and Qmsf should be considered transitional
and approximate and is expected to shift as a result of seasonal- to annual- to decadal-scale cycles in wave climate, sediment
supply, and sediment transport. Coarser grained deposits (coarse sand to boulders) of unit Qmsc, which are recognized on the
basis of their moderate seafloor relief and high basckscatter (sheet 3), as well as camera observations (sheet 6) and sampling
(Reid and others, 2006; Barnard and others, 2009), are found locally in water depths less than about 15 m, except offshore
of Rincon Point where they extend to depths of about 21 m. The largest Qmsc deposits are present at the mouths of Rincon Creek
and Toro Canyon Creek. The convex seafloor relief of these coarse-grained deposits suggests that they are wave-winnowed lags
that armor the seafloor and are relatively resistant to erosion. The sediments may, in part, be relict, having been deposited
in shallower marine (or even alluvial?) environments at lower sea levels in the latest Pleistocene and Holocene; this seems
especially likely for the arcuate lobe of unit Qmsc that extends 1,700 m offshore from Rincon Point. The Qmsc deposits offshore
of Toro Canyon Creek are found adjacent to onshore alluvial and alluvial fan deposits (Minor and others, 2009) and, thus,
may have formed as distal-alluvial or fan-delta facies of that system. Offshore bedrock exposures are assigned to the Miocene
Monterey Formation (unit Tm) and the Pliocene and Pleistocene Pico Formation (unit QTp), primarily on the basis of extrapolation
from the onshore mapping of Tan and others (2003a,b), Tan and Clahan (2004), and Minor and others (2009), as well as the cross
sections of Redin and others (1998, 2004) that are constrained by industry seismic-reflection data and petroleum well logs.
Where uncertainty exists, bedrock is mapped as an undivided unit (QTbu). These strata are exposed in structural highs that
include the Rincon Anticline and uplifts bounded by the Rincon Creek Fault and by the north and south strands of the Red Mountain
Fault. Bedrock is, in some places, overlain by a thin (less than 1 m?) veneer of sediment, recognized on the basis of high
backscatter, flat relief, continuity with moderate- to high-relief bedrock outcrops, and (in some cases) high-resolution seismic-reflection
data; these areas, which are mapped as composite units Qms/Tm, Qms/QTbu, or Qms/QTp, are interpreted as ephemeral sediment
layers that may or may not be continuously present, whose presence or absence is a function of the recency and intensity of
storm events, seasonal and (or) annual patterns of sediment movement, or longer term climate cycles. Two offshore anthropogenic
units also are present in the map area, each related to offshore hydrocarbon production. The first (unit af) consists of coarse
artificial fill associated with construction of the Rincon Island petroleum-production facility near the east edge of the
map area. The second (unit pd) consists of coarse artificial fill mixed with sediment and shell debris, mapped in outcrops
surrounding Rincon Island and at the locations of former oil platforms "Heidi," "Hope," "Hazel,"
and "Hilda" from the Summerland and Carpinteria oil fields (Barnum, 1998). The Monterey Formation is the primary
petroleum-source rock in the Santa Barbara channel, and the Pico Formation is one of the primary petroleum reservoirs. The
Offshore of Carpinteria map area is in the Ventura Basin, in the southern part of the Western Transverse Ranges geologic province,
which is north of the California Continental Borderland (Fisher and others, 2009). This province has undergone significant
north-south compression since the Miocene, and recent GPS data suggest north-south shortening of about 6 to 10 mm/yr (Larson
and Webb, 1992; Donnellan and others, 1993). The active, east-west-striking, north-dipping Pitas Point Fault (a broad zone
that includes south-dipping reverse-fault splays), Red Mountain Fault, and Rincon Creek Fault are some of the structures on
which this shortening occurs (see, for example, Jackson and Yeats, 1982; Sorlien and others, 2000). This fault system, in
aggregate, extends for about 100 km through the Ventura and Santa Barbara Basins and represents an important earthquake hazard
(see, for example, Fisher and others, 2009). References Cited: Barnum, H.P., 1998, Redevelopment of the western portion of
the Rincon offshore oil field, Ventura, California, in Kunitomi, D.S., Hopps, T.E., and Galloway, J.M., eds., Structure and
petroleum geology, Santa Barbara Channel, California: American Association of Petroleum Geologists, Pacific Section, and Coast
Geological Society, Miscellaneous Publication 46, p. 201-215. Donnellan, A., Hager, B.H., and King, R.W., 1993, Discrepancy
between geologic and geodetic deformation rates in the Ventura basin: Nature, v. 346, p. 333-336. Fisher, M.A., Sorlien, C.C.,
and Sliter, R.W., 2009, Potential earthquake faults offshore southern California from the eastern Santa Barbara channel to
Dana Point, in Lee, H.J., and Normark, W.R., eds., Earth science in the urban ocean--The Southern California Continental Borderland:
Geological Society of America Special Paper 454, p. 271-290. Jackson, P.A., and Yeats, R.S., 1982, Structural evolution of
Carpinteria basin, western Transverse Ranges, California: American Association of Petroleum Geologists Bulletin, v. 66, p.
805-829. Larson, K.M., and Webb, F.H., 1992, Deformation in the Santa Barbara Channel from GPS measurements 1987-1991: Geophysical
News Letters, v. 19, p. 1,491-1,494. Minor, S.A., Kellogg, K.S., Stanley, R.G., Gurrola, L.D., Keller, E.A., and Brandt, T.R.,
2009, Geologic map of the Santa Barbara coastal plain area, Santa Barbara County, California: U.S. Geological Survey Scientific
Investigations Map 3001, scale 1:25,000, 1 sheet, pamphlet 38 p., available at http://pubs.usgs.gov/sim/3001/. Redin, T.,
Forman, J., and Kamerling, M.J., 1998, Regional structure section across the eastern Santa Barbara Channel, from eastern Santa
Cruz Island to the Carpinteria area, Santa Ynez Mountains, in Kunitomi, D.S., Hopps, T.E., and Galloway, J.M., eds., Structure
and petroleum geology, Santa Barbara Channel, California: American Association of Petroleum Geologists, Pacific Section, and
Coast Geological Society, Miscellaneous Publication 46, p. 195-200, 1 sheet. Redin, T., Kamerling, M.J., and Forman, J., 2004,
Santa Barbara Channel structure and correlation sections--Correlation section no. 34R., N-S structure and correlation section,
south side central Santa Ynez Mountains across the Santa Barbara channel to the east end of Santa Cruz Island: American Association
of Petroleum Geologists, Pacific Section, Publication CS 32, 1 sheet. Reid, J.A., Reid, J.M., Jenkins, C.J., Zimmerman, M.,
Williams, S.J., and Field, M.E., 2006, usSEABED--Pacific Coast (California, Oregon, Washington) offshore surficial-sediment
data release: U.S. Geological Survey Data Series 182, available at http://pubs.usgs.gov/ds/2006/182/. Sorlien, C.C., Gratier,
J.P., Luyendyk, B.P., Hornafius, J.S., and Hopps, T.E., 2000, Map restoration of folded and faulted late Cenozoic strata across
the Oak Ridge fault, onshore and offshore Ventura basin, California: Geological Society of America Bulletin, v. 112, p. 1,080-1,090.
Tan, S.S., and Clahan, K.B., 2004, Geologic map of the White Ledge Peak 7.5' quadrangle, Santa Barbara and Ventura Counties,
California--A digital database: California Geological Survey Preliminary Geologic Map, scale 1:24,000, available at http://www.conservation.ca.gov/cgs/rghm/rgm/preliminary_geologic_maps.htm.
Tan, S.S., Jones, T.A., and Clahan, K.B., 2003a, Geologic map of the Pitas Point 7.5' quadrangle, Ventura County, California--A
digital database: California Geological Survey Preliminary Geologic Map, scale 1:24,000, available at http://www.conservation.ca.gov/cgs/rghm/rgm/preliminary_geologic_maps.htm.
Tan, S.S., Jones, T.A., and Clahan, K.B., 2003b, Geologic map of the Ventura 7.5' quadrangle, Ventura County, California--A
digital database: California Geological Survey Preliminary Geologic Map, scale 1:24,000, available at http://www.conservation.ca.gov/cgs/rghm/rgm/preliminary_geologic_maps.htm.;
abstract: This part of SIM 3261 presents data for the geologic and geomorphic map (see sheet 10, SIM 3261) of the Offshore
of Carpinteria map area, California. The vector data file is included in "Geology_OffshoreCarpinteria.zip," which
is accessible from http://pubs.usgs.gov/ds/781/OffshoreCarpinteria/data_catalog_OffshoreCarpinteria.html. The offshore part
of the map area largely consists of a relatively shallow (less than about 45 m deep), gently offshore-dipping (less than 1
degree) shelf underlain by sediments derived primarily from relatively small coastal watersheds that drain the Santa Ynez
Mountains. Shelf deposits are primarily sand (unit Qms) at depths less than about 25 m and, at depths greater than about 25
m, are the more fine-grained sediments (very fine sand, silt, and clay) of unit Qmsf. The boundary between units Qms and Qmsf
is based on observations and extrapolation from sediment sampling (see, for example, Reid and others, 2006) and camera ground-truth
surveying (see sheet 6). It is important to note that the boundary between units Qms and Qmsf should be considered transitional
and approximate and is expected to shift as a result of seasonal- to annual- to decadal-scale cycles in wave climate, sediment
supply, and sediment transport. Coarser grained deposits (coarse sand to boulders) of unit Qmsc, which are recognized on the
basis of their moderate seafloor relief and high basckscatter (sheet 3), as well as camera observations (sheet 6) and sampling
(Reid and others, 2006; Barnard and others, 2009), are found locally in water depths less than about 15 m, except offshore
of Rincon Point where they extend to depths of about 21 m. The largest Qmsc deposits are present at the mouths of Rincon Creek
and Toro Canyon Creek. The convex seafloor relief of these coarse-grained deposits suggests that they are wave-winnowed lags
that armor the seafloor and are relatively resistant to erosion. The sediments may, in part, be relict, having been deposited
in shallower marine (or even alluvial?) environments at lower sea levels in the latest Pleistocene and Holocene; this seems
especially likely for the arcuate lobe of unit Qmsc that extends 1,700 m offshore from Rincon Point. The Qmsc deposits offshore
of Toro Canyon Creek are found adjacent to onshore alluvial and alluvial fan deposits (Minor and others, 2009) and, thus,
may have formed as distal-alluvial or fan-delta facies of that system. Offshore bedrock exposures are assigned to the Miocene
Monterey Formation (unit Tm) and the Pliocene and Pleistocene Pico Formation (unit QTp), primarily on the basis of extrapolation
from the onshore mapping of Tan and others (2003a,b), Tan and Clahan (2004), and Minor and others (2009), as well as the cross
sections of Redin and others (1998, 2004) that are constrained by industry seismic-reflection data and petroleum well logs.
Where uncertainty exists, bedrock is mapped as an undivided unit (QTbu). These strata are exposed in structural highs that
include the Rincon Anticline and uplifts bounded by the Rincon Creek Fault and by the north and south strands of the Red Mountain
Fault. Bedrock is, in some places, overlain by a thin (less than 1 m?) veneer of sediment, recognized on the basis of high
backscatter, flat relief, continuity with moderate- to high-relief bedrock outcrops, and (in some cases) high-resolution seismic-reflection
data; these areas, which are mapped as composite units Qms/Tm, Qms/QTbu, or Qms/QTp, are interpreted as ephemeral sediment
layers that may or may not be continuously present, whose presence or absence is a function of the recency and intensity of
storm events, seasonal and (or) annual patterns of sediment movement, or longer term climate cycles. Two offshore anthropogenic
units also are present in the map area, each related to offshore hydrocarbon production. The first (unit af) consists of coarse
artificial fill associated with construction of the Rincon Island petroleum-production facility near the east edge of the
map area. The second (unit pd) consists of coarse artificial fill mixed with sediment and shell debris, mapped in outcrops
surrounding Rincon Island and at the locations of former oil platforms "Heidi," "Hope," "Hazel,"
and "Hilda" from the Summerland and Carpinteria oil fields (Barnum, 1998). The Monterey Formation is the primary
petroleum-source rock in the Santa Barbara channel, and the Pico Formation is one of the primary petroleum reservoirs. The
Offshore of Carpinteria map area is in the Ventura Basin, in the southern part of the Western Transverse Ranges geologic province,
which is north of the California Continental Borderland (Fisher and others, 2009). This province has undergone significant
north-south compression since the Miocene, and recent GPS data suggest north-south shortening of about 6 to 10 mm/yr (Larson
and Webb, 1992; Donnellan and others, 1993). The active, east-west-striking, north-dipping Pitas Point Fault (a broad zone
that includes south-dipping reverse-fault splays), Red Mountain Fault, and Rincon Creek Fault are some of the structures on
which this shortening occurs (see, for example, Jackson and Yeats, 1982; Sorlien and others, 2000). This fault system, in
aggregate, extends for about 100 km through the Ventura and Santa Barbara Basins and represents an important earthquake hazard
(see, for example, Fisher and others, 2009). References Cited: Barnum, H.P., 1998, Redevelopment of the western portion of
the Rincon offshore oil field, Ventura, California, in Kunitomi, D.S., Hopps, T.E., and Galloway, J.M., eds., Structure and
petroleum geology, Santa Barbara Channel, California: American Association of Petroleum Geologists, Pacific Section, and Coast
Geological Society, Miscellaneous Publication 46, p. 201-215. Donnellan, A., Hager, B.H., and King, R.W., 1993, Discrepancy
between geologic and geodetic deformation rates in the Ventura basin: Nature, v. 346, p. 333-336. Fisher, M.A., Sorlien, C.C.,
and Sliter, R.W., 2009, Potential earthquake faults offshore southern California from the eastern Santa Barbara channel to
Dana Point, in Lee, H.J., and Normark, W.R., eds., Earth science in the urban ocean--The Southern California Continental Borderland:
Geological Society of America Special Paper 454, p. 271-290. Jackson, P.A., and Yeats, R.S., 1982, Structural evolution of
Carpinteria basin, western Transverse Ranges, California: American Association of Petroleum Geologists Bulletin, v. 66, p.
805-829. Larson, K.M., and Webb, F.H., 1992, Deformation in the Santa Barbara Channel from GPS measurements 1987-1991: Geophysical
News Letters, v. 19, p. 1,491-1,494. Minor, S.A., Kellogg, K.S., Stanley, R.G., Gurrola, L.D., Keller, E.A., and Brandt, T.R.,
2009, Geologic map of the Santa Barbara coastal plain area, Santa Barbara County, California: U.S. Geological Survey Scientific
Investigations Map 3001, scale 1:25,000, 1 sheet, pamphlet 38 p., available at http://pubs.usgs.gov/sim/3001/. Redin, T.,
Forman, J., and Kamerling, M.J., 1998, Regional structure section across the eastern Santa Barbara Channel, from eastern Santa
Cruz Island to the Carpinteria area, Santa Ynez Mountains, in Kunitomi, D.S., Hopps, T.E., and Galloway, J.M., eds., Structure
and petroleum geology, Santa Barbara Channel, California: American Association of Petroleum Geologists, Pacific Section, and
Coast Geological Society, Miscellaneous Publication 46, p. 195-200, 1 sheet. Redin, T., Kamerling, M.J., and Forman, J., 2004,
Santa Barbara Channel structure and correlation sections--Correlation section no. 34R., N-S structure and correlation section,
south side central Santa Ynez Mountains across the Santa Barbara channel to the east end of Santa Cruz Island: American Association
of Petroleum Geologists, Pacific Section, Publication CS 32, 1 sheet. Reid, J.A., Reid, J.M., Jenkins, C.J., Zimmerman, M.,
Williams, S.J., and Field, M.E., 2006, usSEABED--Pacific Coast (California, Oregon, Washington) offshore surficial-sediment
data release: U.S. Geological Survey Data Series 182, available at http://pubs.usgs.gov/ds/2006/182/. Sorlien, C.C., Gratier,
J.P., Luyendyk, B.P., Hornafius, J.S., and Hopps, T.E., 2000, Map restoration of folded and faulted late Cenozoic strata across
the Oak Ridge fault, onshore and offshore Ventura basin, California: Geological Society of America Bulletin, v. 112, p. 1,080-1,090.
Tan, S.S., and Clahan, K.B., 2004, Geologic map of the White Ledge Peak 7.5' quadrangle, Santa Barbara and Ventura Counties,
California--A digital database: California Geological Survey Preliminary Geologic Map, scale 1:24,000, available at http://www.conservation.ca.gov/cgs/rghm/rgm/preliminary_geologic_maps.htm.
Tan, S.S., Jones, T.A., and Clahan, K.B., 2003a, Geologic map of the Pitas Point 7.5' quadrangle, Ventura County, California--A
digital database: California Geological Survey Preliminary Geologic Map, scale 1:24,000, available at http://www.conservation.ca.gov/cgs/rghm/rgm/preliminary_geologic_maps.htm.
Tan, S.S., Jones, T.A., and Clahan, K.B., 2003b, Geologic map of the Ventura 7.5' quadrangle, Ventura County, California--A
digital database: California Geological Survey Preliminary Geologic Map, scale 1:24,000, available at http://www.conservation.ca.gov/cgs/rghm/rgm/preliminary_geologic_maps.htm.
Citation
- Title Geology and geomorphology--Offshore of Carpinteria, California.
-
- creation Date
2018-05-21T11:18:51.643838
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Linkage for online resource
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- URL: http://pubs.usgs.gov/sim/3261/
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- URL: http://pubs.usgs.gov/ds/781/
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Metadata data stamp:
2018-08-06T20:09:33Z
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- notes: This metadata record was generated by an xslt transformation from a dc metadata record; Transform by Stephen M. Richard, based
on a transform by Damian Ulbricht. Run on 2018-08-06T20:09:33Z
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