摘要
研究了发现于四川省自贡市距著名的大山铺恐龙化石坑０．５～３ｋｍ处的几株化石木。它们的地质时代与大山铺恐龙动物群相同，地层层位大致相当，属于中侏罗世的下沙溪庙组和新田沟组。根据解剖结构特征，确定它们属于原始的松柏类植物———南洋杉型木属中的一个新种，命名为自贡南洋杉型木新种（ＡｒａｕｃａｒｉｏｘｙｌｏｎｚｉｇｏｎｇｅｎｓｉｓＤｕａｎｓｐ．ｎｏｖ．）。化石木的发现对探讨恐龙的生活环境有重要的意义。
This paper describs three fossil woods, which were firstly found in Zigong city, Sichuan Province, China. The localities of the fossil woods are close to the locality of the famous Dashanpu dinosaur quarry of Zigong. The strata of the fossil woods bearing are Xiashaximiao Formation and Xintiangou Formation of the Middle Jurassic, approximately match the strata of the Dashanpu dinosaurs. According to the structures of the secondary xylem, the fossil woods belonged to the primitive conifer genusAraucarioxylon. Because it was comparatively and obviously different from the other species in this genus, it is assigned as a new species: A. zigongensis. As there was neither fossil leaf nor fossil pollen or spore found in the dinosaur bearing strata before, the discovery of these fossil woods might bear some important significance in the dinosaur research.
关键词
南洋杉型木
中侏罗世
化石木
Araucarioxylon, Middle Jurassic, Fossil woodAraucarioxylon zigongensis Duan sp. nov. (Pl.Ⅰ) Growth rings distinct and distant, 2.8 to 9 mm, most 4.5 to 6 mm. Early wood wide and tracheids biger, rounded or somewhat squarish, the largest 53 to 56
