南澳大利亚“始新世/渐新世界线”(Chinaman guly后退)前后介形虫组合的古深度测量

IF 1.2 4区地球科学 Q3 PALEONTOLOGY

Alcheringa Pub Date : 1996-01-01 DOI:10.1080/03115519608619470

S. Majoran

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引用次数: 12

摘要

南澳大利亚Chinaman沟组是一个退退的非海相-边缘海相单元，先前与“始新统/渐新统界线”1型层序界线Ta 4.3/4.4相对应。那里没有介形类动物。在布兰奇点组(BPF)下部有丰富的cytherelid、krithiid、pontocypriid、paracypriid和trachyleberidid介形类，而在中国沟组(PWF)上的Port Willunga组(PWF)上则有丰富的bairdiids、xestoleberidids、hemicytherids和loxoconchids。BPF和PWF之间的主要差异是在四足类、loxoconchia类和半足类的物种组成上。一系列对应分析鉴定出Paracypris, Kuiperiana, Krithe, tasmancypris ?其中，Argilloecia、Trachyleberis、Cytherella和Bythocypris是BPF的重要属(表明古深度为120-200 m);、Loxoconcha、Microcytherura、bairdiids、Schizocythere、Cytheralison、Kangarina和Xestoleberis…

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Palaeobathymetry of ostracod associations before and after the Chinaman Gully regression (‘Eocene/Oligocene boundary’) in South Australia

The Chinaman Gully Formation in South Australia is a regressive non-marine to marginal marine unit previously correlated with the ‘Eocene/Oligocene boundary’ type 1 Sequence Boundary Ta 4.3/4.4. It is barren of ostracods. Cytherellid, krithiid, pontocypridid, paracypridid and trachyleberidid ostracods are abundant in the underlying Blanche Point Formation (BPF), whereas bairdiids, xestoleberidids, hemicytherids and loxoconchids are more abundant in the Port Willunga Formation (PWF) which overlies the Chinaman Gully Formation. A major contrast in trachyleberidid, loxoconchid and hemicytherid species composition is evident between the BPF and PWF. A bootstrap variety of correspondence analysis identified Paracypris, Kuiperiana, Krithe, Tasmanocypris?, Argilloecia, Trachyleberis, Cytherella and Bythocypris as significant genera (indicating a palaeodepth of 120–200 m) in the BPF and Quadracythere, Hornibrookella?, Loxoconcha, Microcytherura, bairdiids, Schizocythere, Cytheralison, Kangarina and Xestoleberis a...

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来源期刊

Alcheringa 地学-古生物学

CiteScore

2.60

自引率

7.70%

发文量

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.