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TitleSalt-marsh aggradation in response to late-Holocene sea-level rise at Amherst Point, Nova Scotia, Canada
AuthorShaw, J; Ceman, J
SourceThe Holocene vol. 9, no. 4, 1999 p. 439-451,
Alt SeriesGeological Survey of Canada, Contribution Series 1997287
PublisherSAGE Publications
Mediapaper; on-line; digital
File formatpdf
ProvinceNova Scotia; New Brunswick
NTS21H/09; 21H/10; 21H/15; 21H/16
AreaAmherst Point; Cumberland Basin; Bay of Fundy; Maccan River
Lat/Long WENS -64.3750 -64.2333 45.8750 45.7500
Subjectspaleontology; Nature and Environment; radiocarbon dating; radiocarbon dates; carbon-14 dates; carbon isotopes; fossil plants; marshes; salt marshes; sea level changes; macrofossils; sea level fluctuations; Bay of Fundy; salt marsh; sea level; radicarbon; macrofossils; aggradation rates; plants
Illustrationslocation maps; core logs; tables; graphs; cross-sections, stratigraphic; stratigraphic columns
Released2016 07 27
AbstractA radiocarbon 14C chronology determined for plant macrofossils in exposed salt-marsh sediments at Amherst Point, Nova Scotia, Canada, shows that the edge of the high salt marsh aggraded 7.5 m since 900 BC, equivalent to a mean rate of 25.9 cm 100 yr-1. Four phases of rapid aggradation (900-600 BC, 100 BC-AD 200, AD 700-1100, and AD 1600 to present) were interspersed with three phases of slower aggradation (600-100 BC, AD 200-700, and (tentatively) AD 1100-1600). The stepped pattern of marsh aggradation probably resulted from eustatic sea-level fluctuations superimposed on background signals of crustal subsidence and tidal-range expansion. Because the rate of high salt-marsh aggradation lagged or exceeded the rate of higher high water (HHW) increase at various times, the high salt-marsh aggradation trend only approximates the trend of HHW increase. The eustatic sea-level fluctuations are estimated to have a range of at least 0.8 m.

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