V

Figure 7. Gymnosperm and angiosperm palynomorphs (sample Tu 01; see explanation of Figure 6 for comments) from the

Lower Red Unit; all x 444. Gymnosperms: a, b, Classopollis sp., c, d, Pinuspollenites sp., e, Ephedripites rotundus, f — k, Cycadopites sp., 1, Perinopollenites sp., m, Albietineaepollenites sp., n, Piceaepollenites sp., o, p, Podocarpidites sp., q, Cedripites sp., r, Piceites sp., s, Pseudopicea sp. Angiosperms: t, u, Retitricolpites sp., v, w, Tricolpites sp.

1997b). The dinosaurian taxa found in the Mazongshan area (Dong, 1997b) include Siluosaurus zhangqiani (Hypsilophodontidae) (Dong, 1997d), Probactrosa urus rnazongshanensis (Iguanodontidae) (Lu, 1997), Psittacosaurus mazongshanensis (Psittaco- sauridae) (Xu, 1997), Archaeoceratops oshirnai (Neoceratopsia) (Dong l~t Azuma, 1997), Nanshiungo- saurus bohlini (Segnosauria), and a few theropod and sauropod fragments. Ankylosaurids, mamenchisaurids 124 F. Tang

and well-preserved ornithominids were found during 1998 — 1999, as were gobiconodontid mammals.

These vertebrate fossils provide important infor- mation for correlation with vertebrate assemblages elsewhere in Asia. Psittacosaurids are known only from the Lower Cretaceous of Asia. Phylogenetic analyses of the psittacosaur species show that Psittacosaurus rnazongshanensis and P. xinjt'angensis are sister species. This clade is more closely related to et al.

P. mongoliensis (Mongolia and Siberia) than the chronologically older P. sinensis, P. meilyingensis and Chaoyangsaurus from eastern China (Xu, 1997; Zhao et al., 1999). P. mongoliensis is also known from a series of other sites in Mongolia, including IWoobur (Jerzykiewicz R Russell, 1991), and from the Shestakovo site in Siberia (Maschenko R Lopatin, 1998). It is generally regarded as Aptian — Albian in age (Barsbold 8r Perle, 1984; Weishampel, 1990; Dodson, 1996).

The type specimen of Archaeoceratops oshimai is