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The site of Longgupo is located north of the subtropical zone and is part of the domain of eastern fauna. The large number of mammal species identified at this site enables clarification of the broad pattern of paleoenvironmental change for the three assemblages from the first stratigraphic sequence (HuangW.-B. excavations). The different species have been classified in four biogeographic groups: subtropical (moderate monsoon), tropical forest (hot and humid climate), montane (cold climate) and prairie (cold and dry climate). Variation in the representation rate of each of these groups enables general reconstruction of the paleoenvironments for the three assemblages identified at Longgupo: a lower assemblage in a hot and humid climate with cold and dry episodes, an intermediate assemblage in a rather cold and dry climate in the lower part, becoming progressively warmer and humid toward the top of the sequence with a monsoon influence more marked than the present day, and an upper assemblage in a rather cold and dry climate. This biochronology and general paleoenvironmental reconstruction are clearly important, but as mentioned above, the stratum by stratum correspondence between the old and new stratigraphic sequences has been quite difficult because the position of material recovered during the early excavations was not recorded. All rights reserved, Elsevier