The Hangenberg event
is a bioevent
that occurred at the end of the Famennian
epoch (late Devonian
) associated with the Late Devonian extinction
(roughly 358.9 ± 0.4 million years ago); it was an anoxic event
marked by a black shale
. It has been proposed that this was related to a rapid sea-level fall due to the last phase of the Devonian Southern Hemisphere glaciation
It has also been suggested that it was linked to an increase in terrestrial plant cover, leading to increased nutrient supply in rivers. This may have led to eutrophication
of semi-restricted epicontinental
seas and could have stimulated algal blooms
It is named from the Hangenberg Shale, part of a sequence that straddles the Devonian-Carboniferous boundary, from the Rhenish Massif in Germany.
Following the extinction, vertebrates experienced reduced body size for the following 36 million years, at least in part because smaller taxa diversified more successfully.
This page was last edited on 28 October 2017, at 23:42 (UTC)
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