A drop of eustatic sea level by about 60 m to 120 m lower than present-day levels, commencing around 30, 000 years BP, caused the revealing of Beringia as a durable and extensive geographic feature connecting Siberia with Alaska.
42.
In 1987 1988 a revised eustatic sea-level curve for the Mesozoic and Cenozoic eras was published, now known as the "'Haq sea-level curve "', in reference to the Pakistani-American Oceanographer Bilal Haq.
43.
As outlined in van Dijk et al . ( 1998 ) this phenomenon can be explained in two ways : A major eustatic sea level drop, or a tectonic uplift of the margins ( for example associated with a minor sea level drop ).
44.
"Eustatic " change ( as opposed to local change ) results in an alteration to the global sea levels due to changes in either the volume of water in the world's oceans or net changes in the volume of the ocean basins.
45.
Smaller and localised sedimentary cycles are not related to worldwide ( eustatic ) sea level changes but more to the supply of sediment to the adjacent regression, if the water depth is decreasing, the shoreline migrates seaward ( basinward ) and the previous shoreline is eroded.
46.
At the onset of deglaciation about 19, 000 calendar years ago, a brief, at most 500-year long, glacio-eustatic event may have contributed as much as 10 m to sea level with an average rate of about 20 mm / yr.
47.
Since Roman times and perhaps earlier, the isostatic rebound from the weight of previous ice sheets, and its interplay with the eustatic change in sea level, have resulted in the old valley of the River Brent, together with that of the Thames, silting up again.
48.
All of these units are marine sands and clay cats from the Ypresian ( 55.8-48.6 million years ago ) and Lutetian ( 48.6-40.4 million years ago ) eustatic sea level was relatively high after the Paleocene Eocene Thermal Maximum.
49.
:: : Eustatic sea level is a tricky subject these days . There is much proxy data but if coral growth is factored in, then paleo-environmental sea level readings are perhaps unreliable in those locations . ~ discuss ! " ) 18 : 14, 11 September 2012 ( UTC)
50.
Hardie and his students and colleagues studied cyclic sedimentation, confirming that platform carbonates of the Middle Triassic ( Anisian-Ladinian ) of the Latemar buildup consist of a vertical stack of over 500 thin ( ave . thickness 0.6-0.85m ) shallowing-upward depositional cycles that record high frequency eustatic sea level oscillations in tune to Milankovitch astronomical rhythms.
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