Estuarine sedimentation, sediment character, and foraminiferal distribution in central San Francisco Bay, California

Chin, John L.; Woodrow, Donald L.; McGann, Mary; Wong, Florence L.; Fregoso, Theresa A.; Jaffe, Bruce E.

doi:10.3133/ofr20101130

Cited by 7 publications

(9 citation statements)

References 28 publications

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“…In the San Francisco Bay, similar living assemblages are found in the deep western bay estuarine cluster of McGann (in Chin et al, 2010) at water depths ranging from 14 to 49 m. Arnal et al (1980) described a fauna including Ammonia beccarii, Elphidium, rare Bolivina and Buliminella, in which agglutinated species are rare or absent, in a deep channel of the southern San Francisco Bay, where water depths range from 12 to 22 m and ocean water is present year round. Both areas and assemblages contain rare planktic foraminifers.…”

Section: Paleontologymentioning

confidence: 97%

“…Harman, 2001, personal commun.). In San Francisco Bay, northern California, Globigerina bulloides occurs rarely in the entrance to the bay and in the central bay, just west of the Golden Gate Bridge (Arnal et al, 1980;Chin et al, 2010). In the Gulf of California, planktic species are common in outer shelf water depths and deeper, but are missing from large areas of the Gulf of California, including the Colorado River delta, due to rainfall and run off, which cause salinity variations (Walton, 1955;Bandy, 1961).…”

Section: Paleontologymentioning

confidence: 98%

“…The number of foraminiferal species in shallow saline lakes is consistent across the lake, whereas in larger lakes with greater depths, diversity decreases toward the center due to the increase in organic carbon content and the decrease in pH of the sediment (Arnal, 1961;Chin et al, 2010). With few exceptions the foraminiferal fauna in saline lakes that have had no connection with marine waters usually contain fi ve or fewer species (Bach huber and McClellan, 1977;Cann and de Deckker, 1981;Anadon, 1989;Kázmér, 1990;Patterson et al, 1997;Giralt et al, 1999;Boudreau et al, 2001;Wennrich et al, 2007).…”

Section: Saline Lake Versus Marine Origin Of the Bouse Formationmentioning

confidence: 98%

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Evidence for a marine incursion along the lower Colorado River corridor

McDougall

Martínez

2014

Geosphere

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Foraminiferal assemblages in the stratigraphically lower part of the Bouse Formation in the Blythe basin (lower Colorado River corridor, western USA) indicate marine conditions, whereas assemblages in the upper part of the Bouse Formation indicate lacustrine conditions and suggest the presence of a saline lake. Benthic foraminiferal assemblages in the lower part of the Bouse Formation are similar to lagoonal and inner neritic biofacies of the modern Gulf of California. Evidence suggesting a change from marine to lacustrine conditions includes the highest occurrence of planktic foraminifers at an elevation of 123 m above sea level (asl), the change from low diversity to monospecifi c foraminiferal assemblages composed only of Ammonia beccarii (between 110 and 126 m asl), an increase in abundance of A. beccarii specimens (above ~110 m asl), increased number of deformed tests (above ~123 m asl), fi rst appearance of Chara (at ~85 m asl), lowest occurrence of reworked Cretaceous coccoliths (at ~110 m), a decrease in strontium isotopic values (between 70 and 120 m), and δ 18 O and δ 13 C values similar to seawater (between 70 and 100 m asl). Planktic foraminifers indicate a late Miocene age between 8.1 and 5.3 Ma for the oldest part of the Bouse Formation in the southern part of the Blythe basin. Benthic and planktic foraminifers correlate with other late Miocene sections in the proto-Gulf of California and suggest that the basal Bouse Formation in the Blythe basin was deposited at the northern end of this proto-gulf. After the marine connection was restricted or eliminated, the Colorado River fl owed into the Blythe basin, forming a saline lake. This lake supported a monospecifi c foraminiferal assemblage of A. beccarii until the lake spilled into the Salton Trough and the Colorado River became a through-fl owing river.

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Section: Paleontologymentioning

confidence: 97%

Section: Paleontologymentioning

confidence: 98%

Section: Saline Lake Versus Marine Origin Of the Bouse Formationmentioning

confidence: 98%

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Evidence for a marine incursion along the lower Colorado River corridor

McDougall

Martínez

2014

Geosphere

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“…The South Bay shoreline generally consists of fine-grained sediments and has a long coastal line that is dendritic and highly complex encompassing many sloughs and ponds. The seafloor in this part of the bay is composed mostly of silt and clay sediments (Conomos and Peterson 1977;Chin et al 2010). At PA, two different intertidal and nearshore (including part of the subtidal zone) settings were investigated, one in a slough environment (PA-SP) and one adjacent to open bay waters (PA-NC).…”

Section: Study Sitesmentioning

confidence: 99%

“…Density gradient drives estuarine circulation, and water residence time is on the order of days during high river discharge periods and up to months during the dry season (Walters et al 1985). The surrounding coastline is comprised of sandstone and shale along a narrow shoreline, and the Central Bay seafloor is comprised mostly of sand and silty sand (Conomos and Peterson 1977;Chin et al 2010). …”

Section: Study Sitesmentioning

confidence: 99%

Submarine Groundwater Discharge-Derived Nutrient Loads to San Francisco Bay: Implications to Future Ecosystem Changes

Null

Dimova

Knee

et al. 2012

Estuaries and Coasts

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Submarine groundwater discharge (SGD) was quantified at select sites in San Francisco Bay (SFB) from radium ( 223 Ra and 224 Ra) and radon ( 222 Rn) activities measured in groundwater and surface water using simple mass balance box models. Based on these models, discharge rates in South and Central Bays were 0.3-7. − to NH 4 + available to phytoplankton with implications to bay productivity, phytoplankton species distribution, and nutrient uptake rates. This assessment of nutrient delivery via groundwater discharge in SFB may provide vital information for future bay ecological wellbeing and sensitivity to future environmental stressors.

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