Lower Ordovician trilobites from the Septembersø formation, North-East Greenland

McCobb, Lucy M. E.; Boyce, W. Douglas; Knight, Ian; Stouge, Svend

doi:10.1080/03115518.2014.951913

Alcheringa: An Australasian Journal of Palaeontology

2014

DOI: 10.1080/03115518.2014.951913

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Lower Ordovician trilobites from the Septembersø formation, North-East Greenland

Lucy M. E. McCobb¹,

W. Douglas Boyce²,

Ian Knight³

et al.

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2024

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Cited by 4 publications

References 21 publications

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Stratigraphy and faunas of the Durness Group (Cambrian–Middle Ordovician) of Northwest Scotland: constraints on tectonic models and the development of the Great American Carbonate Bank

Smith,

Raine,

Repetski

2024

Geol. Mag.

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The Durness Group of NW Scotland records deposition on the Laurentian margin from the basal Miaolingian (Cambrian, 509 Ma) to the Dapingian–Darriwilian boundary interval (Middle Ordovician, 470.3–468.9 Ma). The 930 m thick succession of peritidal and subtidal carbonates was deposited on the Scottish promontory, a nearly 120° deflection in the Palaeozoic continental margin between the Appalachian and Greenland sectors. These sediments were deposited as part of the Great American Carbonate Bank, a non-uniformitarian, continent-scale carbonate platform developed on the peneplaned craton. Measurement and description of a bed-by-bed composite section through the Durness Group provide a high-resolution reference framework that integrates conodont biostratigraphy, chemostratigraphy and sequence stratigraphy, including correlation with the Sauk megasequence and its subdivisions. The Sauk II–Sauk III sequence boundary marks the base of the group. The top of the group is faulted against rocks of the Moine thrust zone, generated by the Scandian orogeny, but sedimentation was probably terminated by the earlier Grampian arc–continent collision at 470–469 Ma. The highly mature quartz arenites of the underlying Ardvreck Group (Cambrian Series 2) indicate that there was no source-to-sink depositional continuity from the Hebridean foreland to the Dalradian Supergroup, which has coeval clastic sedimentary rocks of contrasting composition.

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Stratigraphy and faunas of the Durness Group (Cambrian–Middle Ordovician) of Northwest Scotland: constraints on tectonic models and the development of the Great American Carbonate Bank

Smith,

Raine,

Repetski

2024

Geol. Mag.

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Early Ordovician (Skullrockian) Trilobites of the Antiklinalbugt Formation, Northeast Greenland, and their Biostratigraphic Significance

et al. 2014

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The Antiklinalbugt Formation of northeast Greenland comprises peritidal to subtidal carbonate sediments, deposited in shallow shelf settings during an early Tremadocian transgressive-regressive megacycle. The succession of shales and microbial, muddy and grainy limestone, with minor dolostone at the base and top, terminates at the cryptic Fimbulfjeld disconformity. The formation has yielded trilobites collected on Ella Ø, Albert Heim Bjerge, and Kap Weber by C. Poulsen (1920s and 1930s), J. W. Cowie and P. J. Adams (1950s), and during recent field studies in 2000 and 2001. The fauna includes dimeropygidsTulepyge cowieiandT. tesellan. spp., hystricuridsMillardicurusandHystricurus, and several species ofSymphysurina. Micragnostus chiushuensis(Kobayashi, 1931) is rare, as areChasbellussp.,Clelandiasp., andLunacrania?. The presence of severalSymphysurinaspecies places the Antiklinalbugt Formation within theSymphysurinaZone.Chasbellusindicates the upper (lower Ordovician) part of theSymphysurinaZone for the lower upper Antiklinalbugt Formation. Conodonts place the middle lower formation in theCordylodus intermediusconodont Biozone, the lower upper part in theCordylodus angulatusconodont Biozone and the uppermost part in theRossodus manitouensisconodont Biozone. This combined fauna is characteristic of the upper Skullrockian Stage of the Ibexian Series, with the lower part of the Antiklinalbugt Formation lying within the uppermost Cambrian of North America, and the upper part within the lower Ordovician. The entire formation lies within the global Tremadocian Stage of the early Ordovician.

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Early Ordovician trilobites from Barnicarndy 1 stratigraphic well of the southern Canning Basin, Western Australia

Smith,

Allen

2023

Alcheringa: An Australasian Journal of Palaeontology

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Lower Ordovician trilobites from the Septembersø formation, North-East Greenland

Cited by 4 publications

References 21 publications

Stratigraphy and faunas of the Durness Group (Cambrian–Middle Ordovician) of Northwest Scotland: constraints on tectonic models and the development of the Great American Carbonate Bank

Stratigraphy and faunas of the Durness Group (Cambrian–Middle Ordovician) of Northwest Scotland: constraints on tectonic models and the development of the Great American Carbonate Bank

Early Ordovician (Skullrockian) Trilobites of the Antiklinalbugt Formation, Northeast Greenland, and their Biostratigraphic Significance

Early Ordovician trilobites from Barnicarndy 1 stratigraphic well of the southern Canning Basin, Western Australia

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