globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.05.010
论文题名:
Early Permian (Asselian) vegetation from a seasonally dry coast in western equatorial Pangea: Paleoecology and evolutionary significance
作者: Falcon-Lang H.J.; Lucas S.G.; Kerp H.; Krainer K.; Montañez I.P.; Vachard D.; Chaney D.S.; Elrick S.D.; Contreras D.L.; Kurzawe F.; DiMichele W.A.; Looy C.V.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 433
起始页码: 158
结束页码: 173
语种: 英语
英文关键词: Callipterids ; Estuary ; Mangrove ; New Mexico ; Permian ; Voltzian conifers
英文摘要: The Pennsylvanian-Permian transition has been inferred to be a time of significant glaciation in the Southern Hemisphere, the effects of which were manifested throughout the world. In the equatorial regions of Pangea, the response of terrestrial ecosystems was highly variable geographically, reflecting the interactions of polar ice and geographic patterns on atmospheric circulation. In general, however, there was a drying trend throughout most of the western and central equatorial belt. In western Pangea, the climate proved to be considerably more seasonally dry and with much lower mean annual rainfall than in areas in the more central and easterly portions of the supercontinent. Here we describe lower Permian (upper Asselian) fossil plant assemblages from the Community Pit Formation in Prehistoric Trackways National Monument near Las Cruces, south-central New Mexico, U.S.A. The fossils occur in sediments within a 140-m-wide channel that was incised into indurated marine carbonates. The channel filling can be divided into three phases. A basal channel, limestone conglomerate facies contains allochthonous trunks of walchian conifers. A middle channel fill is composed of micritic limestone beds containing a brackish-to-marine fauna with carbon, oxygen and strontium isotopic composition that provide independent support for salinity inferences. The middle limestone also contains a (par)autochthonous adpressed megaflora co-dominated by voltzian conifers and the callipterid Lodevia oxydata. The upper portions of the channel are filled with muddy, gypsiferous limestone that lacks plant fossils. This is the geologically oldest occurrence of voltzian conifers. It also is the westernmost occurrence of L. oxydata, a rare callipterid known only from the Pennsylvanian-Permian transition in Poland, the Appalachian Basin and New Mexico. The presence of in situ fine roots within these channel-fill limestone beds and the taphonomic constraints on the incorporation of aerial plant remains into a lime mudstone indicate that the channel sediments were periodically colonized by plants, which suggests that these species were tolerant of salinity, making these plants one of, if not the earliest unambiguous mangroves. © 2015 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68892
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作者单位: Department of Earth Sciences, Royal Holloway, University of London, Egham, Surrey, United Kingdom; Forschungsstelle für Paläobotanik, Geologisch-Paläontologisches Institut, Westfälische Wilhelms-Universität Münster, Heisenbergstraße 2, Münster, Germany; New Mexico Museum of Natural History and Science, 1801 Mountain Rd. NW, Albuquerque, NM, United States; Institute of Geology and Paleontology, University of Innsbruck, Innsbruck, Austria; Department of Earth and Planetary Sciences, University of California, Davis, CA, United States; Université Lille 1, UMR 8217: Géosystèmes, Villeneuve d'Ascq Cédex U.F.R., France; Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC, United States; Illinois State Geological Survey, 615 East Peabody Drive, Champaign, IL, United States; Department of Integrative Biology and Museum of Paleontology, University of California Berkeley, 3060 Valley Life Science Building, Berkeley, CA, United States

Recommended Citation:
Falcon-Lang H.J.,Lucas S.G.,Kerp H.,et al. Early Permian (Asselian) vegetation from a seasonally dry coast in western equatorial Pangea: Paleoecology and evolutionary significance[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,433
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