Two New Species of Protocedroxylon Gothan (Pinaceae) from the
Middle Jurassic of Eastern Inner Mongolia, NE China |
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| Authors: | ZHANG Yujin TIAN Ning ZHU Zhipeng WANG Yongdong WU Xinwei ZHANG Zhibin ZHANG Chao SI Qiuliang and MA Yongfei |
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| Institution: | 1 Shenyang Center of the Geological Survey, CGS, Shenyang 110034, China
2 College of Earth Sciences, Jilin University, Changchun, 130061, China,3 College of Palaeontology, Shenyang Normal University, Shenyang 110034, China
4 State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, CAS, Nanjing 210008, China,3 College of Palaeontology, Shenyang Normal University, Shenyang 110034, China,4 State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, CAS, Nanjing 210008, China
5 Center for Excellence in Life and Palaeoenvironment, Chinese Academy of Sciences, Nanjing 210008, China,1 Shenyang Center of the Geological Survey, CGS, Shenyang 110034, China,1 Shenyang Center of the Geological Survey, CGS, Shenyang 110034, China,1 Shenyang Center of the Geological Survey, CGS, Shenyang 110034, China,1 Shenyang Center of the Geological Survey, CGS, Shenyang 110034, China and 1 Shenyang Center of the Geological Survey, CGS, Shenyang 110034, China |
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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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| Keywords: | Protocedroxylon Pinaceae Wanbao Formation Middle Jurassic Inner Mongolia |
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