Liberalism: Do You Agree We've Had Enough of It? Message Board

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Politics : Liberalism: Do You Agree We've Had Enough of It?

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TideGlider

To: TopCat who wrote (181703)	5/25/2015 12:45:26 PM
From: locogringo	3 Recommendations of 224718

Is there some reason that sea levels should remain constant throughout the history of this planet???? I think Kenneth is still surprised by tides. en.wikipedia.org Changes through geologic time Comparison of two sea level reconstructions during the last 500 Ma. The scale of change during the last glacial/interglacial transition is indicated with a black bar. Note that over most of geologic history long-term average sea level has been significantly higher than today. Sea level change since the end of the last glacial episode. Changes displayed in metres. Sea level has changed over geologic time. As the graph shows, sea level today is very near the lowest level ever attained (the lowest level occurred at the Permian-Triassic boundary about 250 million years ago). During the most recent ice age (at its maximum about 20,000 years ago) the world's sea level was about 130 m lower than today, due to the large amount of sea water that had evaporated and been deposited as snow and ice, mostly in the Laurentide ice sheet. Most of this had melted by about 10,000 years ago. Hundreds of similar glacial cycles have occurred throughout the Earth's history. Geologists who study the positions of coastal sediment deposits through time have noted dozens of similar basinward shifts of shorelines associated with a later recovery. This results in sedimentary cycles which in some cases can be correlated around the world with great confidence. This relatively new branch of geological science linking eustatic sea level to sedimentary deposits is called sequence stratigraphy. The most up-to-date chronology of sea level change through the Phanerozoic shows the following long-term trends:[13] Gradually rising sea level through the Cambrian Relatively stable sea level in the Ordovician, with a large drop associated with the end-Ordovician glaciation Relative stability at the lower level during the Silurian A gradual fall through the Devonian, continuing through the Mississippian to long-term low at the Mississippian/Pennsylvanian boundary A gradual rise until the start of the Permian, followed by a gentle decrease lasting until the Mesozoic.

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