Stratigraphically significant acritarchs in uppermost Cambrian to basal Ordovician strata of northwestern Algeria

Vecoli, M. and Playford, G. (1997) Stratigraphically significant acritarchs in uppermost Cambrian to basal Ordovician strata of northwestern Algeria. Grana, 36 1: 17-28. doi:10.1080/00173139709362585


Author Vecoli, M.
Playford, G.
Title Stratigraphically significant acritarchs in uppermost Cambrian to basal Ordovician strata of northwestern Algeria
Journal name Grana   Check publisher's open access policy
ISSN 0017-3134
1651-2049
Publication date 1997-01-01
Sub-type Article (original research)
DOI 10.1080/00173139709362585
Open Access Status Not yet assessed
Volume 36
Issue 1
Start page 17
End page 28
Total pages 10
Place of publication Stockholm, Sweden
Publisher Almqvist & Wiksell
Language eng
Subject 0403 Geology
Abstract In Cambro-Ordovician transitional beds of the Hassi R'mel area, northwestern Algeria, three stratigraphically successive acritarch assemblage zones can be recognized: HM/A (uppermost Cambrian), HM/B (basal Tremadoc), and HM/C (lower Tremadoc; with associated graptolites of the Rhabdinopora flabelliformis sensu lato group). Thus, the boundary between assemblages HM/A and HM/B is considered to approximate to the Cambrian-Ordovician boundary in the study area. Six morphologically distinctive acritarch species that facilitate recognition of zonal boundaries are described. One genus and four species are newly instituted: Phenacoon imperfectum gen. et sp. nov., Impluviculus araneus sp. nov., Ladogella saharica sp. nov., and Multiplicisphaeridium attenuatum sp. nov. Revised circumscriptions of two other species—Acanthodiacrodium baculatum and Baltisphaeridium verutum—incorporate morphological details not previously available. P. imperfectum and L. saharica are abundant at the top of assemblage zone HM/A; A. baculatum characterizes the base of assemblage zone HM/B; and B. verutum, I. araneus and M. attenuatum are characteristic components of the lower part of HM/C assemblage zone.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Physical Sciences Publications
 
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