IN-SITU BENTHOS AND PALEO-OXYGENATION IN THE MIDDLE CAMBRIAN BURGESS SHALE, BRITISH-COLUMBIA, CANADA

Authors
ALLISON PA BRETT CE
Citation
Pa. Allison et Ce. Brett, IN-SITU BENTHOS AND PALEO-OXYGENATION IN THE MIDDLE CAMBRIAN BURGESS SHALE, BRITISH-COLUMBIA, CANADA, Geology, 23(12), 1995, pp. 1079-1082
Citations number
39
Categorie Soggetti
Geology
Journal title
Geology → ACNP
ISSN journal
00917613
Volume
23
Issue
12
Year of publication
1995
Pages
1079 - 1082
Database
ISI
SICI code
0091-7613(1995)23:12<1079:IBAPIT>2.0.ZU;2-9
Abstract
The Middle Cambrian Burgess Shale was deposited under variable levels of oxygenation. During periods of oxygenation, low-diversity shell bed s were formed and the muds were colonized by infauna. Under these circ umstances pyrite was restricted to anoxic microenvironments and formed small (1 mm) discrete aggregated masses. Soft-bodied organisms were p reserved under low-oxygen conditions typified by evenly dispersed pyri te, and an absence of trace fossils and shell beds.