Enrichment and stability in the Pliocene mammalian fauna of North China

摘要: The Late Neogene vertebrate fossil record from Yushe Basin presents multiple, superposed assemblages a single area, spanning roughly the interval of 6-2 Ma. Both large and small mammals show peak species richness in middle Pliocene but indicate relative faunal stability throughout Pliocene. Large turnover, especially extinction, around 5 2.5 Small change (over half several genera), as well turnover at level, between 4 3.4 loosely controlled dating these events does not disprove hypothetical correlation with North America global climatic shifts. Elements that lack antecedents, some being long-distance dispersers, appear section, little effect on resident assemblage. First records well-documented immi- grants (from America, Europe, Africa, southern Asia, or high latitudes) generally do coincide ecomorph extinctions. Early exchange Asia appears to have been balanced both directions involved proportion fauna. Immigration probably was opportunistic contributed enrichment. We interpret mammalian representing fauna stable ca. Ma changed mainly by additions congeneric substitutions.