Tidal wetland record of holocene sea-level movements and climate history

Fletcher, Charles H.; Pelt, Jennifer E. van; Brush, Grace S.; Sherman, John W.

doi:10.1016/0031-0182(93)90067-s

Cited by 60 publications

(29 citation statements)

References 48 publications

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“…Of special interest are upward-shallowing sequences separated by a transgressive overlap boundary (TOB, Fletcher et al, 1993) which appear to record a rapid deepening e.g., from marsh to near-marine intertidal environments. In the Bilbao and Santoña estuaries (Figure 1) a TOB has been identified (Cearreta and Murray, 1996;Cearreta, 1998).…”

Section: Introductionmentioning

confidence: 99%

AMS 14C dating of Holocene estuarine deposits: consequences of high-energy and reworked foraminifera

Cearreta

Murray

2000

The Holocene

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Benthic foraminiferal species were used to AMS date Holocene sediments adjacent to transgressive overlap boundaries (TOB) in two high energy estuaries in North Spain. It had previously been recognised that the foraminifera could be divided into indigenous and exotic components. Whereas it was known that the exotic forms had been transported into the estuaries from the adjacent inner shelf, it was assumed that the indigenous forms were in situ. The AMS dates based on indigenous forms obtained from pairs of samples adjacent to the TOB showed an inverse relationship in three out of four boreholes (i.e., the age of the higher sample was older than that of the lower). The most probable explanation of this unexpected result is that there had been significant reworking of indigenous foraminifera especially associated with the transgressive episode. It is concluded that, in high energy estuaries, AMS dating on foraminiferal shells is influenced by transport and reworking even of the indigenous component. Therefore, if only foraminifera are available for dating, we recommend that closely spaced pairs of samples should be dated in order to assess the reliability of the results.

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Section: Introductionmentioning

confidence: 99%

AMS 14C dating of Holocene estuarine deposits: consequences of high-energy and reworked foraminifera

Cearreta

Murray

2000

The Holocene

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“…These TOBs are interpreted as episodes of acceleration of the rate of sea-level rise relative to the rate of marsh aggradation. TOB episodes would thus indicate net sealevel rises (Fletcher et al, 1993). The above authors consider that TOBs T3 (4400 ± 200 sidereal years) and T6 (1800 ± 200 sidereal years) were the most important at basin scale, and could represent real eustatic rises.…”

Section: Relative Sea-level Changesmentioning

confidence: 99%

“…Some of these authors described several periods of high level, which were always placed below the modern mean sea-level. Fletcher et al (1993) found that the sedimentary depositional environment in the saltmarshes in Wolfe Glade (Delaware Bay, USA) was controlled by sediment availability, tidal range and relative sea-level movements. These authors described five TOBs (Transgressive Overlap Boundaries) during the last 6 ka.…”

Section: Relative Sea-level Changesmentioning

confidence: 99%

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Marsh development and sea level changes in the Gernika Estuary (southern Bay of Biscay): foraminifers as tidal indicators

Pascual¹,

Rodríguez-Lázaro²

2006

Sci. Mar.

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SUMMARY:The ecological distribution of some species of Foraminifera living in estuaries can be used in the interpretation of former coastal lines. There is a close relationship between tide level and the distribution of particular benthic foraminifer species. A characterisation of tide levels based on the benthic foraminifers in four cores from this estuary allowed us to interpret the changes over time in transitional environments during the modern Holocene. The estuary was filled during the last 6500 years following a general accretional model. Marshes have existed in this area for about 4600 years. This model is described for the first time in the area, based on benthic foraminiferal zones. These zones define a general emergence sequence, interrupted by a transgressive marine pulsation. We describe the evolution of marsh sub-environments in relation to the sea-level changes, materialised by a transgressive pulsation which shows an interruption in the accretional process dated 1910 ± 50 BP.Keywords: foraminifers, palaeoenvironmental evolution, Holocene, Gernika estuary, southern Bay of Biscay. RESUMEN: EVOLUCIÓN DE UNA MARISMA Y CAMBIOS DEL NIVEL DEL MAR EN EL ESTUARIO DE GERNIKA (SUR DEL GOLFO DE VIZCAYA): LOS FORAMINÍFEROS COMO INDICADORES DE MAREAS.-La distribución ecológica de algunas especies de foraminí-feros que viven en estuarios pueden ser utilizadas en la interpretación de antiguas líneas de costa. Existe una clara relación entre el nivel mareal y la distribución de especies concretas de foraminíferos bentónicos. La caracterización de estos niveles de mareas basados en los foraminíferos bentónicos en cuatro sondeos de este estuario, permite interpretar los cambios en estos ambientes transicionales durante el Holoceno. El estuario ha sido rellenado durante los últimos 6500 años, siguiendo un modelo general acrecional. Las marismas han existido en esta área desde hace unos 4600 años. Este modelo describe la evolución de los subambientes de marisma, en relación con cambios en el nivel del mar, materializado por una pulsación transgresiva que evidencia una interrupción en el proceso acrecional, datada de 1910 ± 50 BP.

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“…To support his argument that conditions were drier during the early to mid-Holocene, Otvos refers to Fletcher et al (1993) in the Delaware Bay. Otvos states that conifers dominated the area after the Hypsithermal climatic optimum.…”

mentioning

confidence: 99%

Comment on “Holocene aridity and storm phases, Gulf and Atlantic coasts, USA” by Ervin G. Otvos, 2005, Quaternary Research 63, 368–373

Goman

Leigh

2006

Quat. res.

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Tidal wetland record of holocene sea-level movements and climate history

Cited by 60 publications

References 48 publications

AMS 14C dating of Holocene estuarine deposits: consequences of high-energy and reworked foraminifera

AMS 14C dating of Holocene estuarine deposits: consequences of high-energy and reworked foraminifera

Marsh development and sea level changes in the Gernika Estuary (southern Bay of Biscay): foraminifers as tidal indicators

Comment on “Holocene aridity and storm phases, Gulf and Atlantic coasts, USA” by Ervin G. Otvos, 2005, Quaternary Research 63, 368–373

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