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 late 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.

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

VECOLI, MARCO;
1997-01-01

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 late 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/77533
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