作者：董明星

摘要：Three kinds of artiodactyl footprints from Tunggur Formation are described:l)four-toe footprint with all four subequal toes distinct; 2) two-toe footprint with the posterior part joined and the anterior part distinct; 3) two-toe footprint with the third and the forth digits completely distinct.
    The anterior part of the four-toe footprint made by the third and the forth digits was about the same size and the same level as the posterior part of the footprintmade by the second and the fifth digits. This kind of footprint described in the present paper was left by primitive artiodactyls. At present, this field of investigation is lying fallow. Although most of the artiodactyls in Tunggur period left only two-toe footprint, four-toe footprint reflects a relatively early stage of evolution from four-toe to two-toe artiodactyls since the first appearance of artiodactyls in Early Eocene.

关键词：Tunggur,  Nei Mongol,  mid-Miocene,  artiodactyls,  footprints

卷期：37卷 04期

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