FOSSIL PLANTS FROM DONGYUEMIAO MEMBER OF THE ZILIUJING FORMATION AND LOWER-MIDDLE JURASSIC BOUNDARY IN SICHUAN BASIN, CHINA
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Abstract:
In recent years, more fossil plants, including 14 genera and 18 species, have been found from the Dongyuemiao Member of the Ziliujing Formation in Sichuan Basin. Of them, a new species and a species discovered for the first time in this basin, i.e. Stachypteris? anomala Meng (sp. nov.) and Klukia exilis (Phillips), are described here. All the important elements of the plant assemblage from the Dongyuemiao Member were extended up from the Zhenzhuchong Member, which shows that this assemblage basically inherited the assemblage aspect of the Zhenzhuchong Member. On the ground that Dictyophyllum nathorsti, D. nilssoni and Otozamites hsiangchiensis have not been recorded in Middle Jurassic and the Ziliujing Formation is subdivided into two sedimentary cycles, it is suggested that the Dongyuemaio Member is of Toarcian age and the Lower Middle Jurassic boundary is placed between the Dongyuemiao Member and the Ma'anshan Member of the Ziliujing Formation.
