Late Quaternary relative sea level in Southern California and Monterey Bay

Reynolds, Laura C.; Simms, Alexander R.

doi:10.1016/j.quascirev.2015.08.003

Cited by 42 publications

(29 citation statements)

References 92 publications

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“…These rates are comparable to rates similarly determined by 210 Pb and 137 Cs in Monterey Bay by Lewis et al (2002) that ranged from 0.15 to 3.9 cm/year. Moreover, these average rates are also in line with 20th century sea level rise for Monterey Bay (0.15 cm/yr) as determined from tide gage records corrected for local uplift (Reynolds and Simms, 2015), whereby sedimentation rates approximate the accommodation space created by local sea level rise. Similarly, our overall average rate for the longer core PS1410-08GC at 0.08 cm/yr is also in line with the late Holocene sea level rise estimate for Monterey Bay of 0.13 cm/yr (Reynolds and Simms, 2015).…”

Section: Age Modelssupporting

confidence: 70%

Variability in Shelf Sedimentation in Response to Fluvial Sediment Supply and Coastal Erosion Over the Past 1,000 Years in Monterey Bay, CA, United States

et al. 2019

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Continental shelf environments are uniquely situated to capture some of the most dynamic processes on Earth including climatic variability and anthropogenic modifications to coastal systems. Understanding how these processes have affected sediment delivery and accumulation on the shelf in the past may provide insight into potential changes in the future. To address this, we investigated shelf sedimentation within Monterey Bay, California. Sediment cores were collected from four locations throughout the bay to capture both the modern and late Holocene sedimentological record using grain size analysis, and sediment chronologies determined from 210 Pb, 137 Cs, and 14 C. From the grain size results we focused on the total percent sand,

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Section: Age Modelssupporting

confidence: 70%

Variability in Shelf Sedimentation in Response to Fluvial Sediment Supply and Coastal Erosion Over the Past 1,000 Years in Monterey Bay, CA, United States

et al. 2019

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“…The 14 C ages from material directly below this surface correlate well with a local relative sea-level curve (Reynolds and Simms, 2015). Where sampled, S 3 beds are only present directly below the transgressive ravinement surface and likely represent early Holocene shoreface deposits (Fig.…”

Section: Facies Interpretationsupporting

confidence: 53%

Highstand shelf fans: The role of buoyancy reversal in the deposition of a new type of shelf sand body

Steel

Simms

Warrick

et al. 2016

Geological Society of America Bulletin

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Although sea-level highstands are typically associated with sediment-starved continental shelves, high sea level does not hinder major river floods. Turbidity currents generated by plunging of sediment-laden rivers at the fluvial-marine interface, known as hyperpycnal flows, allow for cross-shelf transport of suspended sand beyond the coastline. Hyper pycnal flows in southern California have deposited six subaqueous fans on the shelf of the northern Santa Barbara Channel in the Holocene. Using eight cores and nine grab samples, we describe the deposits, age, and stratigraphic architecture of two fans in the Santa Barbara Channel. Fan lobes have up to 3 m of relief and are composed of multiple hyperpycnite beds ~5 cm to 40 cm thick. Deposit architecture and geometry suggest the hyperpycnal flows became positively buoyant and lifted off the seabed, resulting in well-sorted, structureless, elongate sand lobes. Contrary to conventional sequence stratigraphic models, the presence of these features on the continental shelf suggests that active-margin shelves may locally develop high-quality reservoir sand bodies during sea-level highstands, and that such shelves need not be solely the site of sediment bypass. These deposits may provide a Quaternary analogue to many well-sorted sand bodies in the rock record that are interpreted as turbidites but lack typical Bouma-type features.

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“…Figure 23 shows a range of proposed sea-level curves for the Santa Barbara Channel region. Our preferred curve uses the relative sea-level curve between 12 ka and the present developed by Reynolds and Simms (2015) for southern California from analysis of coastal deposits. From 21 to 12 ka, our preferred curve slightly adjusts the global curve of Stanford et al (2011) so that LGM sea level is 123 m below present.…”

Section: Post-lgm Sea-level Historymentioning

confidence: 99%

Shelf evolution along a transpressive transform margin, Santa Barbara Channel, California

et al. 2017

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High-resolution bathymetric and seismic reflection data provide new insights for understanding the post-Last Glacial Maximum (LGM, ca. 21 ka) evolution of the ~120-km-long Santa Barbara shelf, located within a transpressive segment of the transform continental margin of western North America. The goal is to determine how rising sea level, sediment supply, and tectonics combine to control shelf geomorphology and history. Morphologic, stratigraphic, and structural data highlight regional variability and support division of the shelf into three domains. Ages and rates of deformation are derived from a local sea-level-rise model that incorporates an inferred LGM shoreline angle and the LGM wavecut platform. Post-LGM slip rates on the offshore Oak Ridge fault are a minimum of 0.7 ± 0.1 mm/yr. Slip rates on the Pitas Point fault system are a minimum of 2.3 ± 0.3 mm/yr near Pitas Point, and decrease to the west across the Santa Barbara Channel. Documentation of fault lengths, slip rates, and rupture modes, as well as potential zones of submarine landsliding, provide essential information for enhanced regional earthquake and tsunami hazard assessment.

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Late Quaternary relative sea level in Southern California and Monterey Bay

Cited by 42 publications

References 92 publications

Variability in Shelf Sedimentation in Response to Fluvial Sediment Supply and Coastal Erosion Over the Past 1,000 Years in Monterey Bay, CA, United States

Variability in Shelf Sedimentation in Response to Fluvial Sediment Supply and Coastal Erosion Over the Past 1,000 Years in Monterey Bay, CA, United States

Highstand shelf fans: The role of buoyancy reversal in the deposition of a new type of shelf sand body

Shelf evolution along a transpressive transform margin, Santa Barbara Channel, California

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