Marsh Foraminifera and Arcellaceans of the Lower Mississippi Delta: Controls on Spatial Distributions

Scott, David B.; Suter, John R.; Kosters, Elisabeth C.

doi:10.2307/1485911

Cited by 70 publications

(30 citation statements)

References 28 publications

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“…Foraminifera were concentrated from 3-cm 3 bulk sediment samples by washing the material over 500 µm and 32 µm sieves and retaining the particles in this size range. When foraminiferal abundance was sufficient, up to 300 specimens were tallied from the remaining 32 µm to 500 µm fraction, and benthic species were identified using criteria provided by Phleger (1965), Scott et al (1991), Javaux andSen Gupta (1999).…”

Section: Sedimentary Analysismentioning

confidence: 99%

A decadally-resolved paleohurricane record archived in the late Holocene sediments of a Florida sinkhole

Lane¹,

Donnelly²,

Woodruff³

et al. 2011

Marine Geology

139

221

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A 4500-year record of hurricane-induced storm surges is developed from sediment cores collected from a coastal sinkhole near Apalachee Bay, Florida. Recent deposition of sand layers in the upper sediments of the pond was found to be contemporaneous with significant, historic storm surges at the site modeled using SLOSH and the Best Track, post-1851 A.D. dataset. Using the historic portion of the record for calibration, paleohurricane deposits were identified by sand content and dated using radiocarbon-based age models. Marine-indicative foraminifera, some originating at least 5 km offshore, were present in several modern and ancient storm deposits. The presence and long-term preservation of offshore foraminifera suggest that this site and others like it may yield promising microfossil-based paleohurricane reconstructions in the future. Due to the sub-decadal (~ 7 year) resolution of the record and the site's high susceptibility to hurricane-generated storm surges, the average, local frequency of recorded events, approximately 3.9 storms per century, is greater than that of previously published paleohurricane records from the region. The high incidence of recorded events permitted a time series of local hurricane frequency during the last five millennia to be constructed. Variability in the frequency of the largest storm layers was found to be greater than what would likely occur by chance alone, with intervals of both anomalously high and low storm frequency identified. However, the rate at which smaller layers were deposited was relatively constant over the last five millennia. This may suggest that significant variability in hurricane frequency has occurred only in the highest magnitude events. The frequency of high magnitude events peaked near 6 storms per century between 2800 and 2300 years ago. High magnitude events were relatively rare with about 0-3 storms per century occurring between 1900 to 1600 years ago and between 400 to 150 years ago. A marked decline in the number of large storm deposits, which began around 600 years ago, has persisted through present with below average frequency over the last 150 years when compared to the preceding five millennia.

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Section: Sedimentary Analysismentioning

confidence: 99%

A decadally-resolved paleohurricane record archived in the late Holocene sediments of a Florida sinkhole

Lane¹,

Donnelly²,

Woodruff³

et al. 2011

Marine Geology

139

221

View full text Add to dashboard Cite

show abstract

“…Subsamples of these surface samples were analysed for microfossils (foraminifera, arcellacians, large tintiniids, diatoms and ostracods) and for palynomorphs, including pollen and spores, dinoflagellate cysts, acritarchs and freshwater algal spores, fungal spores and reworked pre-Quaternary palynomorphs. The microfossil subsamples were processed by wet sieving on a 63-m sieve and by microscope examination in water, following the method of Scott et al (1991). The palynology samples were processed by standard methods for Quaternary marine sediments, as outlined herein.…”

Section: Palynology and Micropalaeontologymentioning

confidence: 99%

Characterisation of marine and lacustrine sediments in a drowned thermokarst embayment, Richards Island, Beaufort Sea, Canada

Solomon

Mudie

Cranston

et al. 2000

International Journal of Earth Sciences

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A multidisciplinary study was made of lakes and lagoons in a thermokarst embayment on Richards Island, Canadian Beaufort Sea, in order to investigate the response of the Mackenzie Delta shoreline to changing hydrological influences. Seismo-acoustic profiles made from an amphibious vehicle, combined with sediment core data, show that the deepest lakes contain up to 10 m of transparent or stratified silty mud overlying the Kittigazuit sand basement. Palynological and microfossil data from 21 surface samples allow delineation of freshwater, saltmarsh, tidal flat and subtidal assemblages. These modern reference data allow distinction of freshwater and marine facies in the cores and subsequent interpretation of geochemical content (carbon, ammonia, sulphate). Radiocarbon dates and 137 Cs show that sedimentation rates have increased by an order of magnitude since drowning of the embayment during the past millennium, and that most of this sediment is from the Mackenzie River plume.

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“…Testate amoebae also have been reported in coastal environments, most notably in saltmarshes (e.g. Scott et al, 1977Scott et al, , 1991Scott et al, , 1995Medioli and Scott, 1983;Charman et al, 1998Charman et al, , 2000bCharman et al, , 2002Gehrels et al, 2001) and coastal basins (Patterson et al, 1985;Lloyd, 2000). Until recently, however, these limited studies of coastal thecamoebians generally had been based on the larger specimens found in the size range routinely analysed for foraminiferal analysis (63-500 µm) (e.g.…”

Section: Introductionmentioning

confidence: 99%

Fossil testate amoebae in coastal deposits in the UK: implications for studies of sea‐level change

Roe

Charman

Gehrels

2002

J Quaternary Science

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Assemblages of testate amoebae in UK saltmarshes are strongly correlated with elevation and flooding duration, suggesting that if adequately preserved in sediments they may be used as accurate sea-level indicators. To examine the preservation of testate amoebae in the fossil record in coastal environments, subsamples were collected from a range of coastal sites around Britain, including saltmarsh, coastal reedswamp, isolation basin, back-barrier and coastal raised bog sites. The results showed that testate amoebae are present in the fossil record, although in variable species diversities, concentrations and states of preservation. Testate amoebae were found to be well preserved in isolation basin infills and coastal raised bog deposits, where diverse assemblages (>20 taxa) were recorded. In the upper part of the isolation basin sequence from Loch nan Corr, northwest Scotland, the testate amoebae assemblages showed a greater degree of sensitivity to transitional salinity changes than existing foraminferal and larger testate amoebae data sets. This implies that testate amoebae, particularly small to medium-sized specimens (15-300 µm), may hold considerable potential for sea-level reconstruction in these environments. Preservation of testate amoebae in a freshly sampled core of saltmarsh sediment from South Wales was reasonable, although test distribution decreased significantly in abundance below 18 cm. The assemblage composition was similar to that found in the contemporary surface environment. The preservation of testate amoebae in saltmarsh and coastal reedswamp deposits of mid-Holocene age was variable and generally poor. Partial dehydration of the sediment samples may account for this. Further studies are required to examine the palaeoecology and distribution of testate amoebae in similar coastal settings, to strengthen these preliminary findings.

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Marsh Foraminifera and Arcellaceans of the Lower Mississippi Delta: Controls on Spatial Distributions

Cited by 70 publications

References 28 publications

A decadally-resolved paleohurricane record archived in the late Holocene sediments of a Florida sinkhole

A decadally-resolved paleohurricane record archived in the late Holocene sediments of a Florida sinkhole

Characterisation of marine and lacustrine sediments in a drowned thermokarst embayment, Richards Island, Beaufort Sea, Canada

Fossil testate amoebae in coastal deposits in the UK: implications for studies of sea‐level change

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