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[proh-grey-dey-shuh n] /ˌproʊ greɪˈdeɪ ʃən/
noun, Geology
seaward growth of a beach, delta, fan, etc., by progressive deposition of sediment by rivers or shoreline processes.
Origin of progradation
1905-10; prograde (pro-1 + (retro)grade) + -ation Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for progradation
  • In this report, the upward increase of sandstone within the complex is attributed to progradation of the shoreline.
  • As more channels develop by bifurcation, the rate of progradation decreases.
  • In the latter case, delta progradation would be expected to occur as sediments were deposited on the coastal shelf.
  • It represents deltaic progradation and maturation, with increased sediment yield.
  • Channel incision appears to have been in response to progradation of a fluvial system.

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