Global ETD Search

1	A New Tsuga Species From the Upper Miocene of Yunnan, Southwestern China and Its Palaeogeographic Significance Xing, Yao Wu, Liu, Yusheng Christopher, Su, Tao, Jacques, Frédéric M.B., Zhou, Zhe Kun 01 December 2013 (has links) A new fossil species, Tsuga xianfengensis Xing et Zhou, n. sp., is reported based on two compressed seed cones. The fossil cones were discovered from the upper Miocene Xiaolongtan Formation at the Xianfeng Basin of Yunnan, southwestern China. The discovery of the Tsuga cones confirms the presence of Tsuga in the Miocene of central Yunnan and represents the earliest Tsuga macrofossils in the southwestern China. The new species reveals a close affinity with East Asian Tsuga species, T. chinensis and T. dumosa. It provides fossil evidence to support the molecular data that the Asian clade might be differentiated in the Miocene. China palaeobiogeography Tsuga xianfengensis n. sp. upper Miocene Yunnan
2	A New Tsuga Species From the Upper Miocene of Yunnan, Southwestern China and Its Palaeogeographic Significance Xing, Yao Wu, Liu, Yusheng Christopher, Su, Tao, Jacques, Frédéric M.B., Zhou, Zhe Kun 01 December 2013 (has links) A new fossil species, Tsuga xianfengensis Xing et Zhou, n. sp., is reported based on two compressed seed cones. The fossil cones were discovered from the upper Miocene Xiaolongtan Formation at the Xianfeng Basin of Yunnan, southwestern China. The discovery of the Tsuga cones confirms the presence of Tsuga in the Miocene of central Yunnan and represents the earliest Tsuga macrofossils in the southwestern China. The new species reveals a close affinity with East Asian Tsuga species, T. chinensis and T. dumosa. It provides fossil evidence to support the molecular data that the Asian clade might be differentiated in the Miocene. China palaeobiogeography Tsuga xianfengensis n. sp. upper Miocene Yunnan
3	Pinus prekesiya sp. nov. From the Upper Miocene of Yunnan, Southwestern China and its Biogeographical Implications Xing, Yaowu, Liu, Yu Sheng C., Su, Tao, Jacques, Frédéric M., Zhou, Zhekun 01 April 2010 (has links) Pinus prekesiya Xing, Liu et Zhou sp. nov. was described as a new species on the basis of two well preserved ovulate cones from the upper Miocene of central Yunnan, southwestern China. It is the first fossil record of three dimensionally preserved Pinus ovulate cones from China. Morphological comparisons with 15 previously published Cenozoic cones and seven related extant pine species reveal that the fossil cones are identified as a new species, P. prekesiya sp. nov., which belongs to subsection Pinus of subgenus Pinus. The new species shows a combination of characters of P. kesiya and P. yunnanensis, but has a closer affinity with P. kesiya which occurs in the humid region of Yunnan and therefore suggests a more humid climate in central Yunnan during the late Miocene than today. The general cooling trend during the late Neogene and topographic change due to the dramatic Tibetan uplift might have caused a vicariant origin of P. kesiya and P. yunnanensis from the ancestral P. prekesiya. biogeography fossil ovulate cones Pinaceae Pinus prekesiya sp. nov. southwestern China upper Miocene Yunnan
4	Paleocurrent Analysis of the Upper Miocene Formation, Los Angeles Basin, California Bennett, John Newton, Jr. January 1967 (has links) Almost all sandstone beds occurring in the Upper Miocene formations at the Los Angeles basin were deposited by turbidity currents. Primary textures and structures indicative of turbidites occur in fair abundance throughout all three Upper Miocene formations. All accessible outcrops of the Puente, Modelo, and Upper Miocene portion of the Monterey and Capistrano Formations were scrutinized for sandstone beds containing primary sedimentary structures. Through study of these structures, the direction of current movement was determined. The pattern of current movement displayed reveals that sediment was being transported into the Los Angeles basin from all sides. Current directions and mineralogic studies indicate that essentially three source areas were supplying sediment into the basin. These source areas are 1) the San Gabriel Mountains, 2) an area to the east of the Santa Ana Mountains, and 3) a ridge of metamorphic rock paralleling the present coast line. The majority of sediment was derived from an area in the San Gabriel Mountains located northeast or the basin. This is evidenced by the fact that the thickness, grain size, and total sand content of the Upper Miocene units decrease southwestward across the basin. bedding plane irregularities California Cenozoic current markings current transport Los Angeles Basin Miocene Neogene paleocurrents paleocurrent analysis provenance sedimentary petrology sedimentary structures sedimentation sediments stratigraphy structure Tertiary United States upper Miocene

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