The hypothesis of a predominantly globally euxinic ocean, with low to no oxygen, supports the theory of stalled evolution of complex animals throughout the Boring Billion.
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In particular, the presence of sponges raises questions of the minimum dissolved O 2 content of the oceans in the late Neoproterozoic and the transition from a euxinic Canfield ocean to the modern oxygenated deep-ocean.
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Conversely, the Canfield Ocean theory postulates that deep ocean water remained anoxic long after the Great Oxidation Event, and he argued that the euxinic conditions in the deep ocean ceased the deposition of BIF in ocean sediments.
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