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MN 5 (biostratigraphic zone)
In biostratigraphy, MN 5 is one of the MN zones used to characterize the fossil mammal faunas of the Neogene of Europe. It is preceded by MN 4 and followed by MN 6 and is part of the Orleanian age of the middle Miocene.〔Mein, 1999, table 2.1〕 MN 5 starts within magnetostratigraphic chron C5Cr, at 17.0 million years ago, and ends at the start of chron C5Bn.1r, at 15.0 million years ago, although some different correlations have been proposed.〔Steininger, 1999, pp. 16–17〕 The reference locality used to correlate faunas with this zone is Pontlevoy-Thenay in France; other localities include La Retama in Spain, Castelnau-d'Arbieu in France, and Sandelzhausen in Germany.〔Mein, 1999, p. 28〕
In this zone, the muroid rodent ''Cricetodon'' first appears in western Europe, as do the poorly known ''Lartetomys'' and ''Mixocricetodon''.〔Mein, 1999, p. 29〕 In the extinct rodent family Eomyidae, the genus ''Ligerimys'' last appears during MN 5, but ''Keramidomys'' and ''Eomyops'' appear as immigrants.〔Mein, 1999, p. 28〕 The last European marsupial, ''Amphiperatherium'', last appears in France and Spain during MN 5, but persists into MN 6 in Germany.〔
The primate ''Pliopithecus'' first appears during MN 5. The rhinoceroses ''Prosantorhinus'', ''Plesiaceratherium'', ''Hispanotherium'', and ''Gaindatherium'' make their last appearance, but ''Ancylotherium'' and ''Hoploaceratherium'' first appear during MN 5. ''Chalicotherium'', a member of the related extinct family Chalicotheriidae, also appears for the first time. Several artiodactyls, such as the pig ''Conohyus'', the deer ''Heteroprox'' and ''Dicrocerus'', and the musk deer ''Micromeryx'' first appear, and the pigs ''Bunolistriodon'' and ''Aureliachoerus'' and the ruminants ''Amphimoschus'' and ''Lagomeryx'' last appear in MN 5. Two artiodactyl genera, ''Triceromeryx'' and ''Pseudoeotragus'', occur only during MN 5. The primitive artiodactyl ''Cainotherium'' last appears in France and Spain, but persists into MN 6 in Germany.〔
==References==
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