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dc.contributor.authorGerms, Gerard J. B.
dc.contributor.authorKnoll, Andrew
dc.contributor.authorVidal, Gonzalo
dc.date.accessioned2009-06-01T17:41:44Z
dc.date.issued1986
dc.identifier.citationGerms, Gerard J. B., Andrew H. Knoll, and Gonzalo Vidal. 1986. Latest Proterozoic microfossils from the Nama Group, Namibia (South West Africa). Precambrian Research 32(1): 45-62.en
dc.identifier.issn0301-9268en
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:3009566
dc.description.abstractGray to black shales from the Kuibis and Schwarzrand subgroups of the Nama Group, South West Africa/Namibia, contain a distinctive, if depauperate, assemblage of organic-walled microfossils. The assemblage is dominated by leiosphaerid acritarchs and fragments of the ribbon-like macrofossil <i>Vendotaenia</i>. Small unicells and non-septate filaments interpreted as the sheaths of oscillatorian cyanobacteria occur with variable frequency throughout the subgroups, while <i>Chuaria circularis, Bavlinella faveolata</i>, and a <i>Comasphaeridium</i>-like form (known from a single specimen) are found as rarer components of the biota. Assemblage composition shows no strong stratigraphic trends within the subgroups. The Nama assemblage compares closely with biotas previously described from upper-most Proterozoic (Valdaian) sequences of the Baltic region, Scandinavia, and Australia, and confirms a latest Proterozoic age for the Kuibis and Schwarzrand subgroups and their contained metazoan fossils. Although its significance is unclear, Nama microfossils tend to be strongly corroded. This diagenetic feature is widespread among Valdaian assemblages, but appears to be much less characteristic of older or younger biotas.en
dc.description.sponsorshipOrganismic and Evolutionary Biologyen
dc.language.isoen_USen
dc.publisherElsevieren
dc.relation.isversionofhttp://dx.doi.org/10.1016/0301-9268(86)90029-Xen
dash.licenseMETA_ONLY
dc.titleLatest Proterozoic Microfossils from the Nama Group, Namibia (South West Africa)en
dc.relation.journalPrecambrian Researchen
dash.depositing.authorKnoll, Andrew
dash.embargo.until10000-01-01
dc.identifier.doi10.1016/0301-9268(86)90029-X*
dash.contributor.affiliatedKnoll, Andrew


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