progradation


Also found in: Dictionary, Medical.

progradation

[¦prō·grə′dā·shən]
(geology)
Seaward buildup of a beach, delta, or fan by nearshore deposition of sediments transported by a river, by accumulation of material thrown up by waves, or by material moved by longshore drifting.
References in periodicals archive ?
Open-water intervals are overlain by both poorly drained and well-drained deposits, suggesting that there was not always a substantial wetland area flanking the shoreline and that open-water sedimentation ceased by infilling of the lake and progradation of a muddy shoreline.
The most recent studies in Pennsylvania and adjacent New York suggest that cyclic deposition of the Mahantango Formation could be best explained due to progradation and retreat of what was a straight, tide-influenced shoreline onto a storm-dominated marine shelf (e.
Following the cessation of sea-level rise about 6000 BP, sedimentation and coastal progradation resulted in vertical accretion of the floodplains, and caused the subsequent development of extensive coastal plains found across the north.
Hove, (1992) offers a possible explanation for these anomalies, according to him, the Ea sequence (or generally, Offshore wells) show an upward change from sand dominated lowstand deposits intercalated with transgressive and highstand shales towards thicker and more sand prune highstand and transgressive deposits interrupted by thinner lowstand deposits (reflecting overall progradation across the depobelt),.
Durant la periode interglaciaire d'Olympia, la plus grande partie du bassin a ete rempli de sediments, lesquels ont par la suite ete excaves durant la glaciation de Fraser, sauf un groupe de bancs isoles; la partie sud du bassin a ete partiellement remplie par progradation du delta de la riviere Fraser a l'Holocene.
It is likely that during Raikkula time the zone of dolomitization gradually migrated southwestwards in accordance with progressive shallowing and progradation of the carbonate shelf, especially in the second half of the time.
Continued progradation of the shoreline added an additional 49 beach ridges over the next 3,500 years.
The predominance of gravelly deposits in the base of the Sharon Formation, and the coarsening-upward sequence, imply progradation under stable or rising sea level conditions.
Prolific production of grainy nearshore carbonate sediment on the flanks of paleohighs initiated progradation of shallow-water strata.
Development of this delta was photodocumented to record the history of progradation.
The progradation rate of the delta was determined on the basis of sequential aerial photographs.
This was followed by a 'Transition Phase' when further siltation and coastal progradation blocked the tidal influence and the mangroves retreated towards the coast and the edges of rivers and creeks.