TY - JOUR
T1 - Late Ediacaran occurrences of the organic-walled microfossils Granomarginata and flask-shaped Lagoenaforma collaris gen. et sp. nov.
AU - Agić, Heda
AU - Högström, Anette E.S.
AU - Jensen, Sören
AU - Ebbestad, Jan Ove R.
AU - Vickers-Rich, Patricia
AU - Hall, Michael
AU - Matthews, Jack J.
AU - Meinhold, Guido
AU - Hoyberget, Magne
AU - Taylor, Wendy L.
N1 - Funding Information:
This research was supported by the Swedish Research Council (Vetenskapsrådet) international postdoctoral grant (VR2016-06810) to H. Agić. Fieldwork in Arctic Norway was part of an expedition by the Digermulen Early Life Research Group (DELRG) funded by the Norwegian Research Council (grant no. 231103) to A. Högström. S. Jensen acknowledges funding from Ministerio de Economía, Industria y Competitividad (grant no. CGL 2017-87631-P). Material from Namibia was collected during the 35th IGC pre-conference field workshop to the Nama Group of southern Namibia, sponsored by IGCP 587 project ‘Identity, Facies and Time: The Ediacaran (Vendian) Puzzle’ and the ICS Subcommission on Ediacaran Stratigraphy, organized by P. Vickers-Rich, G. Narbonne, M. Laflamme, S. Darroch, A.J. Kaufman and L. Kriesfeld. In addition to workshop attendees, they are thanked for a delightful journey and engaging discussions in the field. Thanks also to G. Schneider, then Director, and staff at the Namibian Geological Survey for facilitating the IGCP 587 field conference, and to the owners of Farm Aar and Farm Pockenbank, B. Boehm-Erni and L. Gessart, for allowing access to their lands. We are also grateful to T. Palacios (University of Extremadura) and K. Grey (Geological Survey of Western Australia) who provided valuable feedback on an earlier draft, and thank three anonymous reviewers for their constructive comments.
Publisher Copyright:
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PY - 2021/11/12
Y1 - 2021/11/12
N2 - New occurrences of flask-shaped and envelope-bearing microfossils, including the predominantly Cambrian taxon Granomarginata, are reported from new localities, as well as from earlier in time (Ediacaran) than previously known. The stratigraphic range of Granomarginata extends into the Cambrian System, where it had a cosmopolitan distribution. This newly reported Ediacaran record includes areas from Norway (Baltica), Newfoundland (Avalonia) and Namibia (adjacent to the Kalahari Craton), and puts the oldest global occurrence of Granomarginata in the Indreelva Member (< 563 Ma) of the Stáhpogieddi Formation on the Digermulen Peninsula, Arctic Norway. Although Granomarginata is rare within the assemblage, these new occurrences together with previously reported occurrences from India and Poland, suggest a potentially widespread palaeogeographic distribution of Granomarginata through the middle-late Ediacaran interval. A new flask-shaped microfossil Lagoenaforma collaris gen. et sp. nov. is also reported in horizons containing Granomarginata from the Stáhpogieddi Formation in Norway and the Dabis Formation in Namibia, and flask-shaped fossils are also found in the Gibbett Hill Formation in Newfoundland. The Granomarginata-Lagoenaforma association, in addition to a low-diversity organic-walled microfossil assemblage, occurs in the strata postdating the Shuram carbon isotope excursion, and may eventually be of use in terminal Ediacaran biostratigraphy. These older occurrences of Granomarginata add to a growing record of body fossil taxa spanning the Ediacaran-Cambrian boundary.
AB - New occurrences of flask-shaped and envelope-bearing microfossils, including the predominantly Cambrian taxon Granomarginata, are reported from new localities, as well as from earlier in time (Ediacaran) than previously known. The stratigraphic range of Granomarginata extends into the Cambrian System, where it had a cosmopolitan distribution. This newly reported Ediacaran record includes areas from Norway (Baltica), Newfoundland (Avalonia) and Namibia (adjacent to the Kalahari Craton), and puts the oldest global occurrence of Granomarginata in the Indreelva Member (< 563 Ma) of the Stáhpogieddi Formation on the Digermulen Peninsula, Arctic Norway. Although Granomarginata is rare within the assemblage, these new occurrences together with previously reported occurrences from India and Poland, suggest a potentially widespread palaeogeographic distribution of Granomarginata through the middle-late Ediacaran interval. A new flask-shaped microfossil Lagoenaforma collaris gen. et sp. nov. is also reported in horizons containing Granomarginata from the Stáhpogieddi Formation in Norway and the Dabis Formation in Namibia, and flask-shaped fossils are also found in the Gibbett Hill Formation in Newfoundland. The Granomarginata-Lagoenaforma association, in addition to a low-diversity organic-walled microfossil assemblage, occurs in the strata postdating the Shuram carbon isotope excursion, and may eventually be of use in terminal Ediacaran biostratigraphy. These older occurrences of Granomarginata add to a growing record of body fossil taxa spanning the Ediacaran-Cambrian boundary.
KW - biostratigraphy
KW - Cambrian
KW - Ediacaran
KW - organic-walled microfossils
UR - http://www.scopus.com/inward/record.url?scp=85121045715&partnerID=8YFLogxK
U2 - 10.1017/S0016756821001096
DO - 10.1017/S0016756821001096
M3 - Article
AN - SCOPUS:85121045715
SN - 0016-7568
VL - 159
SP - 1071
EP - 1092
JO - Geological Magazine
JF - Geological Magazine
IS - 7
ER -