Early Proterozoic microfossils and penecontemporaneous quartz cementation in the Sokoman Iron Formation, Canada

Title:
Early Proterozoic microfossils and penecontemporaneous quartz cementation in the Sokoman Iron Formation, Canada
Authors:
Knoll, Andrew H.; Simonson, Bruce M.
Abstract:
Early Proterozoic microfossils from the Sokoman Iron Formation, northeastern Canada, are indistinguishable from those of the Gunflint Formation in both morphology and inferred community structure. The contemporaneity of the Sokoman assemblage with the Bitter Springs-like cyanobacteria of the Belcher Supergroup indicates that differences between the two major types of early Proterozoic microbiotas are primarily ecological and not temporal (evolutionary) in nature. In arenaceous iron formations, microfossils are restricted to peloids and are absent from pore-filling silica interpreted as cement. Cemented arenaceous intraclasts indicate that some of the silica was penecontemporaneous, and the abundance of minus-cement porosity in arenaceous iron formations demonstrates that early (pre-compaction) cementation was common.
Citation:
Knoll, Andrew H., and Bruce Simonson. 1981. "Early Proterozoic microfossils and penecontemporaneous quartz cementation in the Sokoman Iron Formation, Canada." Science 211(4481): 478-480.
Publisher:
American Association for the Advancement of Science
DATE ISSUED:
1981-01
Department:
Geology
Type:
article
PUBLISHED VERSION:
10.1126/science.211.4481.478
PERMANENT LINK:
http://hdl.handle.net/11282/309717

Full metadata record

DC FieldValue Language
dc.contributor.authorKnoll, Andrew H.en_US
dc.contributor.authorSimonson, Bruce M.en_US
dc.date.accessioned2013-12-23T16:16:14Z-
dc.date.available2013-12-23T16:16:14Z-
dc.date.issued1981-01en
dc.identifier.citationKnoll, Andrew H., and Bruce Simonson. 1981. "Early Proterozoic microfossils and penecontemporaneous quartz cementation in the Sokoman Iron Formation, Canada." Science 211(4481): 478-480.en_US
dc.identifier.issn0036-8075en_US
dc.identifier.urihttp://hdl.handle.net/11282/309717-
dc.description.abstractEarly Proterozoic microfossils from the Sokoman Iron Formation, northeastern Canada, are indistinguishable from those of the Gunflint Formation in both morphology and inferred community structure. The contemporaneity of the Sokoman assemblage with the Bitter Springs-like cyanobacteria of the Belcher Supergroup indicates that differences between the two major types of early Proterozoic microbiotas are primarily ecological and not temporal (evolutionary) in nature. In arenaceous iron formations, microfossils are restricted to peloids and are absent from pore-filling silica interpreted as cement. Cemented arenaceous intraclasts indicate that some of the silica was penecontemporaneous, and the abundance of minus-cement porosity in arenaceous iron formations demonstrates that early (pre-compaction) cementation was common.en_US
dc.language.isoen_USen_US
dc.publisherAmerican Association for the Advancement of Scienceen_US
dc.identifier.doi10.1126/science.211.4481.478-
dc.subject.departmentGeologyen_US
dc.titleEarly Proterozoic microfossils and penecontemporaneous quartz cementation in the Sokoman Iron Formation, Canadaen_US
dc.typearticleen_US
dc.identifier.journalScienceen_US
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