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

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


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.


Sea-level; pollen; salt marsh; gravel barriers

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