Miocene foraminifera from the Finniss Clay and Cadell Marl, western Murray Basin: taxonomic and taphonomic contrasts and their environmental significance

IF 1.2 4区 地球科学 Q3 PALEONTOLOGY Alcheringa Pub Date : 1999-01-01 DOI:10.1080/03115519908619326
Qianyu Li, B. Mcgowran
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引用次数: 10

Abstract

Sandwiched between Miocene limestones of the Mannum Formation and Morgan Limestone in the western Murray Basin, the Finniss Clay and Cadell Marl contain different foraminiferal faunas with varying taphonomic grades. At the Mannum Pumping Station section, the Finniss Clay fauna has a low diversity, frequent shallow-water forms, and a poor taphonomic grade. In what was the deeper part of the basin at Waikerie, a diverse fauna with well-preserved small species is recorded in sediments equivalent to the Finniss Clay. In contrast, the Cadell Marl from various localities comprises a well-preserved and diverse biofacies with both shallow and deeper water taxa. These contrasts suggest different depositional environments: shallower and warm during deposition of the Finniss Clay and nutrient-rich, dysaerobic and deeper water during deposition of the Cadell Marl. The shallowing event indicated by faunas from the Finniss Clay was due to falling sea level close to the early/middle Miocene boundary, whereas the Cadell ...
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莫里盆地西部Finniss Clay和Cadell Marl中新世有孔虫:分类和分类对比及其环境意义
夹在莫里盆地西部曼纳姆组中新世灰岩和摩根灰岩之间的芬兰泥层和卡德尔泥沼层,含有不同分类等级的不同有孔虫动物群。在Mannum泵站部分,芬兰粘土动物群多样性低,浅水形式频繁,地学等级较差。在威克里盆地较深的地方,在相当于芬兰粘土的沉积物中记录了多种动物,其中保存完好的小物种。相比之下,卡德尔沼泽在不同的地方包括一个保存完好和多样化的生物相,包括浅水和深水分类群。这些对比表明了不同的沉积环境:芬兰粘土沉积时较浅且温暖,而卡德尔沼泽沉积时则是营养丰富、缺氧且较深的水。芬兰粘土的动物群表明,浅化事件是由于靠近中新世早期/中期边界的海平面下降所致,而卡德尔粘土的浅化事件是由于靠近中新世早期/中期边界的海平面下降所致。
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来源期刊
Alcheringa
Alcheringa 地学-古生物学
CiteScore
2.60
自引率
7.70%
发文量
28
审稿时长
>12 weeks
期刊介绍: Alcheringa : An Australasian Journal of Palaeontology is the official journal of the Australasian Palaeontologists. Alcheringa covers all aspects of palaeontology and its ramifications into the earth and biological sciences, including: Taxonomy- Biostratigraphy- Micropalaeontology- Vertebrate palaeontology- Palaeobotany- Palynology- Palaeobiology- Palaeoanatomy- Palaeoecology- Biostratinomy- Biogeography- Chronobiology- Biogeochemistry- Palichnology. Review articles are welcome, and may be solicited from time to time. Thematic issues are also possible. Emphasis is placed on high quality and informative illustration, in both line drawings and photographs. Papers of general significance may receive preference over those of more local interest.
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