Biostratinomy and palaeoecology of the cassian formation (Triassic) of the Southern Alps
Biostratinomy and palaeoecology of the cassian formation (Triassic) of the Southern Alps
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南阿尔卑斯山决明地层（三叠纪）的生物地层学和古生态学
DOI：
10.1016/0031-0182(77)90005-0
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发表时间：
1977
期刊：
影响因子：
--
通讯作者：
J. Wendt
中科院分区：
文献类型：
--
作者：
F. Fürsich;J. Wendt
形成中央白云岩卡西安组（中上三叠统）的沉积物代表以下环境：礁石后区、浅边缘盆地、斜坡和中央盆地。在每一个主要环境中都发现了动物群落，其组成、保存方式和发生情况都被证明是有特征的。在礁石后部区域，藻类/有孔虫类和钙质海绵/珊瑚斑块礁以及高度多样化的框架建造者和珊瑚礁居民动物群，在某些地方保存完好，形成了最显着的特征。在浅边缘盆地中，以腹足动物和食沉积物的双壳类为主的本土藻类草甸/软底群落占主导地位。斜坡沉积物不包含任何本土组合，但要么是远洋动物群的遗骸，要么是以 Cipit 巨石（来自碳酸盐台地外缘的地下胶结部分）、磨损的以厚荠为主的组合或以棘皮动物碎片为主的组合形式的浅水起源的迁移动物群。中央盆地的沉积物缺乏底栖动物群，但含有低多样性的远洋组合，主要是道内拉、波西多尼亚和一些菊石。
The sediments forming the Cassian Formation (Middle—Upper Triassic) of the Central Dolomites represent the following environments: back-reef areas, shallow marginal basins, slope, and central basin. In each of these major environments faunal assemblages were found whose composition, mode of preservation and occurrence proved to be characteristics. In the back-reef areas, algal/foraminifera- and calcareous sponge/coral-patch reefs with a highly diverse fauna of frame-builders and reef-dwellers, in some localities excellently preserved, form the most conspicuous feature. In the shallow marginal basins autochthonous algal meadow/soft-bottom associations dominated by gastropods and deposit-feeding bivalves prevail. Slope deposits do not contain any autochthonous associations but either remains of pelagic faunas or transported faunal elements of shallow-water origin in the form of Cipit boulders (subaerially cemented parts from the outer edge of the carbonate platforms), wornPachycardia rugosa-dominated, or echinoderm debris-dominated assemblages. Sediments of the central basin lack benthic faunas but contains pelagic assemblages of low diversity dominated byDaonella, Posidonia, and some ammonites.