Biostratigraphical divisions

Rushton, A.W.A.; Molyneux, S.G.

doi:10.1144/sr25.3

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…It is overlain by dolostones of the Aftenstjernesø Formation, forming the lowermost part of the Brønlund Fjord Group (Ineson & Peel 1997, 2011). The Buen Formation has been biostratigraphically constrained to Cambrian Series 2, Stages 3–4, based on its acritarch ( Heliosphaeridium dissimilare – Skiagia ciliosa Biozone; Moczydłowska & Zang 2006; Rushton & Molyneux 2011) and trilobite contents ( Nevadella and Olenellus Biozones, Blaker & Peel 1997; Peel & Willman 2018).…”

Section: Geological Settingmentioning

confidence: 99%

Small carbonaceous fossils (SCFs) from North Greenland: new light on metazoan diversity in early Cambrian shelf environments

Wallet

Slater

Willman

et al. 2020

Papers in Palaeontology

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The Sirius Passet Lagerstätte of North Greenland is one of the oldest records of soft‐bodied metazoan‐dominated ecosystems from the early Cambrian. The Lagerstätte site itself is restricted to just a single c. 1‐km‐long outcrop located offshore from the shelf margin, in an area affected by metamorphic alteration during the Ellesmerian Orogeny (Devonian – Early Carboniferous). The recent recovery of small carbonaceous fossils (SCFs) to the south, in areas that escaped the effects of this deformation, has substantially expanded the known coverage of organic preservation into shallower water depositional settings in this region. Here, we describe additional SCF assemblages from the siliciclastic shelf succession of the Buen Formation (Cambrian Series 2, stages 3–4; c. 515 Ma), expanding the previously documented SCF biota. Newly recovered material indicates a rich diversity of non‐mineralizing metazoans, chiefly represented by arthropod remains. These include the filtering and grinding elements of a sophisticated crustacean feeding apparatus (the oldest crustacean remains reported to date), alongside an assortment of bradoriid sclerites, including almost complete, 3D valves, which tie together a number of SCFs previously found in isolation. Other metazoan remains include various trilobite cuticles, diverse scalidophoran sclerites, and a range of metazoan fragments of uncertain affinity. This shallower water assemblage differs substantially from the Sirius Passet biota, which is dominated by problematic euarthropod stem‐group members and sponges. Although some of these discrepancies are attributable to taphonomic or temporal factors, these lateral variations in taxonomic composition also point to significant palaeoenvironmental and/or palaeoecological controls on early Cambrian metazoan communities.

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Section: Geological Settingmentioning

confidence: 99%

Small carbonaceous fossils (SCFs) from North Greenland: new light on metazoan diversity in early Cambrian shelf environments

Wallet

Slater

Willman

et al. 2020

Papers in Palaeontology

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“…). The Buen Formation acritarchs belong to the dissimilare – ciliosa Biozone (Moczydłowska & Zang ; Rushton & Molyneux ).…”

Section: Organic‐walled Microfossilsmentioning

confidence: 99%

The Buen Formation (Cambrian Series 2) biota of North Greenland

Peel

Willman

2018

Papers in Palaeontology

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The diverse metazoan fauna from the upper member of the Buen Formation of North Greenland is described as a complement to published descriptions of the exceptionally preserved fauna of the Sirius Passet Lagerstätte which occurs in the lowest beds of the formation. Considered together with organic‐walled microfossils, which are absent from the Sirius Passet Lagerstätte on account of regional metamorphism, the fauna from the upper member provides an extended picture of the Buen Formation biota (Cambrian, Series 2, Stages 3–4; Montezuman–Dyeran of Laurentian usage). Although dominated numerically by specimens of the olenelline trilobites Limniphacos and Mesolenellus, the oldest assemblages (Montezuma–Dyeran boundary) from the upper member of the Buen Formation are characterized by a high diversity of hyoliths which often occur as partial associations of conch, operculum and helens in the dark mudstones; hyoliths are rare in the Sirius Passet Lagerstätte. Sponges are rare in the upper Buen Formation but diverse at Sirius Passet. Unlike the Sirius Passet Lagerstätte, fossil remains of non‐mineralized metazoans with limbs and other details of internal anatomy do not occur in the upper Buen Formation, although organic tubes assigned to a new selkirkiid stem group priapulid (Sullulika) are common. New taxa: Alutella siku sp. nov., Sullulika broenlundi gen. et sp. nov., Nevadotheca boerglumensis sp. nov., Kalaallitia myliuserichseni gen. et sp. nov., Nasaaraqia hyptiotheciformis gen. et sp. nov., Trapezovitus malinkyi sp. nov., Decoritheca? hageni sp. nov.

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“…Spelling of Eskasoni follows usage on current Canadian topographic maps. (b) Biostratigraphy of the mid-Furongian succession of Avalonia (modified from Rushton, in Rushton & Molyneux, 2011; superzones from Nielsen et al . 2014) showing the distribution of Lotagnostus species.…”

Section: Localitiesmentioning

confidence: 99%

“…The most widely used trilobite biostratigraphy for the Furongian series in Avalonia is a set of zones and subzones (Rushton, in Rushton & Molyneux, 2011) that is similar to the traditional biostratigraphy of Baltica (Ahlberg, 2003, fig. 2).…”

Section: Biostratigraphymentioning

confidence: 99%

The agnostoid arthropod Lotagnostus Whitehouse, 1936 (late Cambrian; Furongian) from Avalonian Cape Breton Island (Nova Scotia, Canada) and its significance for international correlation

Westrop

Landing

2016

Geol. Mag.

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New and archival collections from the Chelsey Drive Group of the Avalon terrane of Cape Breton Island, Nova Scotia, Canada, yield late Cambrian trilobites and agnostoid arthropods with full convexity that contrast with compacted, often deformed material from shale and slate typical of Avalonian Britain. Four species of the agnostoid Lotagnostus form a stratigraphic succession in the upper Furongian (Ctenopyge tumida–Parabolina lobata zones). Two species, L. ponepunctus (Matthew, 1901) and L. germanus (Matthew, 1901) are previously named; L. salteri and L. matthewi are new. Lotagnostus trisectus (Salter, 1864), the type species of the genus, is restricted to compacted material from its type area in Malvern, England. Lotagnostus americanus (Billings, 1860) has been proposed as a globally appropriate index for the base of ‘Stage 10’ of the Cambrian. All four species from Avalonian Canada are differentiated clearly from L. americanus in its type area in Laurentian North America (i.e., from debris flow blocks in Taconian Quebec). In our view, putative occurrences of L. americanus from other Cambrian continents record very different species. Lotagnostus americanus cannot be recognized worldwide, and other taxa should be sought to define the base of Stage 10, such as the conodont Eoconodontus notchhpeakensis.

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Biostratigraphical divisions

Cited by 4 publications

References 12 publications

Small carbonaceous fossils (SCFs) from North Greenland: new light on metazoan diversity in early Cambrian shelf environments

Small carbonaceous fossils (SCFs) from North Greenland: new light on metazoan diversity in early Cambrian shelf environments

The Buen Formation (Cambrian Series 2) biota of North Greenland

The agnostoid arthropod Lotagnostus Whitehouse, 1936 (late Cambrian; Furongian) from Avalonian Cape Breton Island (Nova Scotia, Canada) and its significance for international correlation

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