Accretion and Water-Levels in Enclosed, Seepage Lagoons: Examples from Nova Scotia

S. Jennings, R. W. G. Carter, J. D. Orford

Abstract


Lithostratigraphic and biostratigraphic examination of lagoonal sequences in close proximity to an enclosing gravel ridge, has shown a linkage between lagoon accretionary characteristics and the developmental domain (growth, consolidation, breakdown and reformation) of the gravel barrier. Seepage lagoon water-level rise has occurred on instantaneous time-scales following barrier inlet closure, whereas lagoon accretion has developed over time-scales of 101 - 102 years. Despite this lag, lagoon stratigraphies have accreted more rapidly than relative sea-level (RSL) rise. Switching of lagoons between enclosed seepage and tidal states, as a result of barrier dynamics, has an important control on lagoon accretion, and further renders the use of the resultant stratigraphies for sea-level interpretation difficult.


Keywords


Sea-level; pollen; salt marsh; gravel barriers

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