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Terraces, erosional

High and low stands of sea level are directly recorded as sedimentary coastal onlap sequences and as erosional terraces. These records are complicated in regions of crustal instability, and the rate and nature of crustal deformation determines whether evidence of short-term or long-term sea-level fluctuations are preserved and how easily this evidence is interpreted. Because continental basement warps and fractures through time, and because evidence of sea level is erased by erosion, the interpretation of this evidence to produce sea-level curves for the Phanerozoic has been a subject of considerable debate. [Pg.210]

In regions where land is steadily rising relative to mean sea level, the effects of sea-level fluctuations are sometimes recorded as erosional features on land. Whenever the rate of sea-level rise matches the rate of uplift, there is an apparent sea level stand still. Both deposition and erosion are controlled by this almost fixed base level, and a terrace may form. If sea level falls and again rises, the terrace will have risen sufficiently so that it is preserved upslope. Episodic uplift can produce terraces, but these should not be... [Pg.107]

The coastal geomorphological features that are used as sea-level indicators are the result of either erosional or depositional processes. Ero-sional features can only be preserved on hard, solid rocks, and in some cases they crmstitute indicators of sea-level change. Such indicators are marine notches, potholes, abrasion platforms, etc. Among the depositional formations, marine terraces and beachrocks stand out as the most important sea-level indicators. [Pg.1816]


See other pages where Terraces, erosional is mentioned: [Pg.731]    [Pg.731]    [Pg.211]    [Pg.196]    [Pg.107]    [Pg.255]    [Pg.947]   
See also in sourсe #XX -- [ Pg.211 , Pg.216 ]




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