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What does eustasy mean?

Looking for the meaning or definition of the word eustasy? Here's what it means.

Noun
  1. A worldwide change in sea level, especially one caused by melting ice or tectonic activity. [from 1940s]
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Examples
Eustasy is defined as a global sea level change when referenced to a fixed datum, for instance the center of the earth.
The wedge-shaped geometry, the thickness variation and the stacking pattern of the Guadagnolo succession are the response to eustasy and tectonic subsidence.
Despite some datation uncertainties and the unknown durations of Lower Jurassic cycles, middle frequency sequences appear to be controlled by eustasy.
During this period of initial flooding the new sea is sensitive to changes in climate and eustasy.
Tectonics and eustasy were the two main controls on platform development.
However, it must be noted that the global sea level fluctuations represent a combination of factors such as eustasy, subsidence and sediment supply.

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