| 639 | 154 | 112 |
| 下载次数 | 被引频次 | 阅读次数 |
<正> 根据海域范围的不断窄缩,上扬子区晚奥陶世的海退现象,从古地理的变迁角度,早已证实(刘鸿允,1955;卢衍豪,1959;张文堂,1962;穆恩之等,1981等)。除了古地理方面外,是否还存在着其它的,例如生态地层(Ecostratigraphy)方面的证据呢?此外,引起上扬子区晚奥陶世海退的主要原因是什么?广布于上扬子区的赫南特贝动物群(Hir-
Abstract：An Early Ashgillian brachiopod Foliomena fauna consisting of Foliomena folium (Barran-de), Christiania nilssoni Sheehan, Trimurellina incerta (Xu and Bong) and others is found in the Linxiang Formation (s. 1.) of Guizhou and Sichuan Provinces, Southern China. It has previously been recorded in. Europe and N. America where it occurs in relatively deep shelf communities. Interestingly, the occurrences of the widely documented terminal Ordovician shelly fauna in the same area indicates progressively shallower environments accompanied by the shallower Hirnantia brachiopod communities. Eeostratigraphic evidences may be taken, to suggest a gradual regression of the Ashgillian sea in this area. It is more likely that sea-level changes during Ashgillian time were glacially controlled; and, thus, the extinction of the Hirnantia fauna as a whole is important for determining the Ordovician and Silurian boundary.
中国科学院南京地质古生物研究所,1974:西南地区地层古生物手册。科学出版社。
卢衍豪,1975:华中及西南奥陶纪三叶虫动物群。中国古生物志,新乙种,11号。
刘鸿允,1955:中国古地理图。科学出版社。
戎嘉余,1979:中国的赫南特贝动物群(Hirnantia Fauna)并论奥陶系与志留系的分界。地层学杂卷志,31期。
张青松,1981:南极冰盖的研究现状。冰川冻土,3卷1期。
穆恩之、朱兆玲、陈均远、戎嘉余,1978:四川长宁双河一带奥陶纪地层。地层学杂志,2卷2期。
穆恩之、朱兆玲、陈均远、戎嘉余,1979:西南地区的奥陶系。西南地区碳酸盐岩生物地层。科学出版社。
穆恩之、李积金、葛梅钰、陈旭、倪寓南、林尧坤,1981:华中区晚奥陶世古地理图及其说明书。地层学杂志,5卷3期。
Berry, W. B. N. and Boucot, A. J., 1973: Glacio-eustatic control of Late Ordovician-Early Silurian platform sedimentation and faunal changes. Geol. Soc. Am. Bull., 84．
Boucot, A. J., 1975: Evolution and Extinction Rate Controls. Developments in Palaeontology and Stratigraphy, Elsevier, Amsterdam, 427 pp.
Brenchley, P. J. and Newall, G., 1980: A facies analysis of Upper Ordovician regressive sequences in the Oslo Region, Norway--A record of glacio-eustatic changes, Palaeogeogr, Palaeoclimat, Palaeoecol., 31．
Harper, D. A. T., 1979: The environmental significance of some faunal changes in the Upper Ardmillan succession (upper Ordovician), Girvan. In the Caledonides of the British Isles-Reviewed. Geologieal Society, London. --1980: The brachiopod Foliomena fauna in the Upper Ordovician Ballyvorgal Group of Slieve Bernagh, County Clare. J. Earth Sci. Roy. Dubl. Soc. 2．
Havliek, V., 1974: Some problems of the Ordovician of the Mediterranean region. Vestn. Ustred. Ustavu Geol., 49．
Lenz, A. C., 1976: Late Ordovician-Early Silurian glaciation and the Ordovician-Silurian boundary in the northern Canadian Cordillera. Geology, 4(5) .
Sheehan, P. M., 1973: The relation of the Late Ordovician glaciation to the Ordovician-Silurian changeover in North American brachiopod faunas. Lethaia 6．
--., 1979: Swedish Late Ordovician Marine Benthic Assemblages and their Bearing on Brachiopod Zoogeography, 61-73． In: Gray. J. and Boucot, A. J. (ed.), Historical Biogeography, Plate Tectonics, and the Changing Environment, Oregon State Univ. Press.
--and Lespérance, P. J., 1978: The occurrence of the Ordovician brachiopod Foliomena at Percé, Quebec. Can. J. Earth Sci., 15．
Spjeldnaes, N., 1961: Ordovician climatic zones. Norsk Geol. Tidsskr., 41．
基本信息:
DOI：10.19839/j.cnki.dcxzz.1984.01.003
引用信息:
[1]戎嘉余.上扬子区晚奥陶世海退的生态地层证据与冰川活动影响[J].地层学杂志,1984(01):19-29.DOI:10.19839/j.cnki.dcxzz.1984.01.003.
1984-04-01
1984-04-01