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Two New Species of Protocedroxylon Gothan(Pinaceae) from the middle Jurassic of Eastern Inner Mongolia, NE China

Acta Geologica Sinica(English Edition) 2018年第5期92卷 1685-1699页

作者： ZHANG Yujin TIAN Ning ZHU Zhipeng WANG Yongdong WU Xinwei ZHANG Zhibin ZHANG Chao SI Qiuliang MA Yongfei Shenyang Center of the Geological Survey CGS College of Earth Sciences Jilin University College of Palaeontology Shenyang Normal University State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyCAS Center for Excellence in Life and Palaeoenvironment Chinese Academy of Sciences

Two new coniferous wood taxa, Protocedroxylon zhangii sp. nov. and P. zhalantunense sp. nov., are described from the middle Jurassic wanbao formation in Zhalantun City, Inner Mongolia, NE China. The new discovery represents the first record of petrified wood in the wanbao formation, and contributes to further understanding the floral composition, especially that of the forest, of the wanbao formation. Anatomically, the two new species are characterized by having a mixed type of radial pitting and Abietineentüpfelung. In extant conifers, Abietineentüpfelung is considered to be characteristic of the wood of Pinaceae. The new discovery further indicates that the first occurrence of Abietineentüpfelung in conifer-like wood should be earlier than the Kimmeridgian. The palaeolatitudinal distribution pattern of Protocedroxylon indicates that the genus is a palaeobiogeographically consistent group, which was probably restricted to wetter and cooler temperate climates. In combination with distinct growth rings, the occurrence of Protocedroxylon suggests that a cool temperate and seasonal climate might have prevailed during the sedimentation period of the wanbao formation in eastern Inner Mongolia, NE China. Such a view is also in agreement with the palaeoclimatic conditions indicated by the plant megafossils of the wanbao formation.

关键词： Protocedroxylon Pinaceae wanbao formation middle Jurassic Inner Mongolia

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