Appalachian coal bed palynofloras: changes in composition through time and comparison with other areas

C. Eble
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引用次数: 1

Abstract

Abstract This paper presents a summary of palynological data for Pennsylvanian age coal beds in the Appalachian Basin, discussed primarily from a biostratigraphic perspective. Coal bed palynofloras of Lower Pennsylvanian through early Permian age are compared and correlated with miospore assemblage zones established for western Europe, and the Eastern Interior (Illinois) and Western Interior Basins of the mid-continent USA. Lower Pennsylvanian palynofloras, which are dominated by lycopsid spores, are correlative with the Langsettian of western Europe and the Morrowan of the Eastern and Western Interior mid-continent USA Basins. Stratigraphically useful palynotaxa include Dictyotriletes bireticulatus, Radiizonates striatus, Schulzospora rara, Granasporites medius, Laevigatosporites minor and Endosporites globiformis. Middle Pennsylvanian palynofloras change through time, being lycopsid dominant in the lower part and more heterogeneous in the middle and upper parts with increased contributions from other Pennsylvanian plant groups. They are correlative with the Duckmantian, Bolsovian and Asturian of western Europe and the Atokan and Desmoinesian of the Eastern and Western Interior mid-continent USA Basins. Stratigraphically useful palynotaxa include Secarisporites remotus, Microreticulatisporites sulcatus, Vestispora fenestrata, Triquitrites sculptilis, Laevigatosporites globosus, Radiizonates difformis, Torispora securis, Triquitrites minutus, Mooreisporites inusitatus, Murospora kosankei, Thymospora pseudothiessenii and Schopfites dimorphus. Upper Pennsylvanian and lower Permian coal beds in the Appalachian Basin, in contrast to their Lower and Middle Pennsylvanian counterparts, are strongly dominated by tree fern spore palynotaxa. Palynofloras correlate with the Stephanian and Autunian of western Europe and the Missourian, Virgilian and Wolcampian of the Eastern and Western Interior mid-continent USA Basins.
阿巴拉契亚煤层孢粉植物:组成随时间的变化和与其他地区的比较
摘要本文综述了阿巴拉契亚盆地宾夕法尼亚时代煤层的孢粉学资料,主要从生物地层学的角度进行了讨论。将下宾夕法尼亚—早二叠世的煤层孢粉区与西欧、美国中大陆东部内陆盆地(伊利诺斯州)和西部内陆盆地建立的微孢子组合带进行了比较和对比。下宾夕法尼亚孢粉植物以石松孢子为主,与西欧的Langsettian和美国中部大陆盆地东部和西部的Morrowan相关。地层学上有用的孢粉类群包括Dictyotriletes bireticulatus、radiizates striatus、Schulzospora rara、Granasporites medius、Laevigatosporites minor和Endosporites globiformis。随着时间的推移,宾夕法尼亚中部孢粉植物群呈现出下部以石松类为主,中部和上部异质性较强的变化趋势,其他宾夕法尼亚植物类群的贡献有所增加。它们与西欧的达克曼梯系、博尔索梯系和阿斯图里梯系以及美国内陆盆地东西部的阿托坎梯系和德摩因梯系具有相关性。在地表学上有用的孢粉类群包括Secarisporites remotus、Microreticulatisporites sulcatus、Vestispora fenestrata、triquitites sculptilis、Laevigatosporites globosus、radiizates diforis、Torispora securis、triquitites minutus、Mooreisporites inusitatus、Murospora kosankei、Thymospora pseudothiessenii和Schopfites dimorphus。Appalachian盆地的上宾夕法尼亚和下二叠统煤层,与下宾夕法尼亚和中宾夕法尼亚的煤层相比,以树蕨孢子孢类群为主。孢粉植物与西欧的斯蒂芬尼亚系和奥图尼亚系以及美国中部内陆盆地东部和西部的密苏里系、弗吉尼亚系和wolcamian系有关。
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