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Foraminifera from upper miocene turbidites, Wairarapa, New Zealand

 

作者: Paul Vella,  

 

期刊: New Zealand Journal of Geology and Geophysics  (Taylor Available online 1963)
卷期: Volume 6, issue 5  

页码: 775-793

 

ISSN:0028-8306

 

年代: 1963

 

DOI:10.1080/00288306.1963.10423624

 

出版商: Taylor & Francis Group

 

数据来源: Taylor

 

摘要:

Abundant and well preserved Foraminifera in turbidites of Upper Miocene (Kapitean) age, at Cleland Creek, were compared with Foraminifera in four different depth biofacies of about the same age. The turbidites were deposited in depths certainly greater than 2,000 ft, and probably between 4,000 and 6,000 ft, and were derived from all shallower depths up to about 400 ft or less. Fragile shells and large shells are less common in turbidites than in non-turbidites, and many shells are considered to have been destroyed during transport. The basal layer of each turbidite rhythm is considered to consist of “slumped” neritic sediment with little intermixed deep-water sediment, the intermediate layer to have been deposited by a swift turbidity current, and the upper layer to have been deposited from suspension after the turbidity current ceased flowing. No trace of autochthonous sediment was found between turbidite rhythms.

 

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