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Middle Pleistocene glacial stratigraphy at Baxter Rivulet, western Tasmania, Australia

 

作者: Sean J. Fitzsimons,   Eric A. Colhoun,   Guus Van De Geer,  

 

期刊: Journal of Quaternary Science  (WILEY Available online 1990)
卷期: Volume 5, issue 1  

页码: 17-27

 

ISSN:0267-8179

 

年代: 1990

 

DOI:10.1002/jqs.3390050103

 

出版商: John Wiley&Sons, Ltd

 

关键词: Quaternary;stratigraphy;Baxter Rivulet;western Tasmania;glaciation

 

数据来源: WILEY

 

摘要:

AbstractMapping, analysis and interpretation of glacigenic sediments in the King Valley, Tasmania has led to a revision of the Pleistocene stratigraphy of Tasmania. The sediments provide evidence of a glaciation that occurred between the Middle Pleistocene Henty Glaciation and the Early Pleistocene Linda Glaciation. TheMoore Glaciationis estimated, on the basis of weathering rinds, amino‐acid dating and palaeomagnetism to have occurred between 400000 and 550000 yrs BP. At Baxter Rivulet, sediments of the Moore Glaciation rest unconformably on highly weathered till and weathered Ordovician limestone and are overlain by outwash gravel of the Henty Glaciation. The Moore Glaciation sediments can be divided into four formations on the basis of lithology, organic content and degree of chemical weathering. The Huxley Formation (oldest) was deposited by an ice advance of the Mt. Jukes Glacier and is overlain by the Baxter Formation. The Baxter Formation consists of a bed of organic silty sand which records a cool non‐forested flora of an interstadial period. The overlying Pyramid and Moore formations are outwash gravels from the Mt. Jukes and King Valley glaciers respectively. Though deposited during the same general ice advance, these two gravels were deposited at different times and show that the glaciers of the West Coast Range had spatially differentiated responses to climatic cha

 

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