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Two New Species of Protocedroxylon Gothan (Pinaceae) from the Middle Jurassic of Eastern Inner Mongolia, NE China
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We thank Prof. Zheng Shaolin and the late Prof. Zhang Wu (Shenyang, China) for their help in the identification and classification of the present fossil wood specimens. Special appreciation is due to the three anonymous reviewers for their detailed comments and valuable suggestions that improved this paper. This study was jointly supported by the Geological Survey Programs of the China Geological Survey (Grant Nos. DD20160048-4, 12120113053900, 12120113053800 & 1212011085210), the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant Nos. XDB18030502 & XDB26010302), the National Natural Science Foundation of China (Grant Nos. 41790454, 41702032, 41688103 & 41302004), the State Key Laboratory of Palaeobiology and Stratigraphy (NIGPAS, CAS) (Grant No. 173124), and the Special Fund of the Liaoning Provincial Universities’ Fundamental Scientific Research Project (Grant No. LQN201718).

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    Abstract:

    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.

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ZHANG Yujin, TIAN Ning, ZHU Zhipeng, WANG Yongdong, WU Xinwei, ZHANG Zhibin, ZHANG Chao, SI Qiuliang, MA Yongfei.2018. Two New Species of Protocedroxylon Gothan (Pinaceae) from the Middle Jurassic of Eastern Inner Mongolia, NE China[J]. Acta Geologica Sinica(),92(5):1685-1699

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History
  • Received:April 11,2018
  • Revised:July 27,2018
  • Online: October 19,2018
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