期刊
HISTORICAL BIOLOGY
卷 34, 期 9, 页码 1844-1862出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/08912963.2021.1984448
关键词
Macrofauna; palaeoecology; Upper Cretaceous; Bahloul Formation; Southern Tethys
资金
- King Saud University, Riyadh, Saudi Arabia - Ministry of Higher Education of the Arab republic of Egypt [RSP-2021/139]
The Cenomanian/Turonian strata of the Kasserine area in Tunisia show a unique sedimentological and paleontological pattern, with the dominance of oyster bivalves in macrofaunal communities. By identifying three marker ammonite species, the studied interval was subdivided into three biozones. The macrofaunal diversity decreases over time in the Cenomanian/Turonian strata.
The Cenomanian/Turonian strata of the Kasserine area: Tunisia exhibit a unique sedimentological and palaeontological pattern. Five lithological units have been identified: 1) lower unfossilferous black shale; 2) well-bedded marly unit with thin limestone interbeds; 3) marl unit, 4) same as 2, and 5) unfossilferous dolomitic thick-bedded limestone. The middle three units contain low diversity macrofaunal communities dominated mainly by oyster bivalves with few gastropods and echinoids. Fortunately, three marker ammonite species were identified and are used to subdivide the studied interval into three biozones, including 1) Calycoceras cenomanense, 2) Pseudaspidoceras pseudonodosoides and 3) Neoptychites Cephalotus. Based on constrained clustering and ordination techniques, three distinct macrofaunal associations were identified: 1) Ceratostreon flabellatum, 2) Ilymatogyra africana and 3) Tylostoma (Tylostoma) globosum. In general, the macrofaunal diversity decreases at the Cenomanian-Turonian boundary, which is interpreted to be a consequence of a global sea-level rise and the destruction of shallower habitats. Based on the life habits of the macrofaunal communities, a change from a high-energy (Ceratostreon and Ilymatogyra) to a low-energy (Tylostoma) shallow marine environment was indicated. The dominance of oysters in these nutrient-rich sediments was attributed to their ability to tolerate high turbidity water and to colonise soft-substrate sea bottoms.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据