WAVE-BASE, MARINE PROFILE OF EQUILIBRIUM, AND WAVE-BUILT TERRACES: DISCUSSION

摘要: Some concepts presented in a recent paper by Dietz (1963) can be enlarged upon with an attempt to emphasize what are believed shortcomings. Other negated newer field evidence. The old concept of wave-base should not completely discarded but modified accordance present knowledge the transportation and deposition sediments. Where modern rates supply high enough, sediment is transported deposited on inner central parts continental shelves, generally decrease grain size offshore. The gradient particle cannot predicted merely considering instantaneous conditions may theoretically over net cyclic period region , perhaps range between 1 100 years. effects variations energy occurrence extreme flood or storm thus averaged out. morphological marine profile equilibrium direct corollary, has yet been attained most shelves because rapid, wide Quaternary fluctuations sea level. Use terms delta, topset, foreset bottom-set restricted known lacustrine deltas. In particular, slope deposits termed foresets unless they deltaic origin. Dietz's model structure terrace incorrect for surveyed portions off coasts North America. basic sedimentary framework these terraces appears upbuilding shelf paralic facies outbuilding deposition. This locally salt-dome tectonics, folding, faulting, mass slumping. predominantly realm rather than turbidity-current degradation.