East-Gondwana/Laurentia trilobite connections—What do they tell us?

Palmer, A. R.

doi:10.1007/bf02910570

Cited by 6 publications

(4 citation statements)

References 6 publications

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“…Alternatively, the extinction of redlichiid trilobites (Supplementary Fig. S11V,W) in South China has been interpreted as synchronous with the olenellid extinction event in Laurentia 54 . Recently, the GSSP for both the Stage 5 (now Wuliuan Stage) and Series 3 (Miaolingian Series) has been defined and is based on the FAD of Oryctocephalus indicus (Fig.…”

Section: Resultsmentioning

confidence: 99%

Chemostratigraphic correlations across the first major trilobite extinction and faunal turnovers between Laurentia and South China

Lin

Sundberg

Jiang

et al. 2019

Sci Rep

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During Cambrian Stage 4 (~514 Ma) the oceans were widely populated with endemic trilobites and three major faunas can be distinguished: olenellids, redlichiids, and paradoxidids. The lower–middle Cambrian boundary in Laurentia was based on the first major trilobite extinction event that is known as the Olenellid Biomere boundary. However, international correlation across this boundary (the Cambrian Series 2–Series 3 boundary) has been a challenge since the formal proposal of a four-series subdivision of the Cambrian System in 2005. Recently, the base of the international Cambrian Series 3 and of Stage 5 has been named as the base of the Miaolingian Series and Wuliuan Stage. This study provides detailed chemostratigraphy coupled with biostratigraphy and sequence stratigraphy across this critical boundary interval based on eight sections in North America and South China. Our results show robust isotopic evidence associated with major faunal turnovers across the Cambrian Series 2–Series 3 boundary in both Laurentia and South China. While the olenellid extinction event in Laurentia and the gradual extinction of redlichiids in South China are linked by an abrupt negative carbonate carbon excursion, the first appearance datum of Oryctocephalus indicus is currently the best horizon to achieve correlation between the two regions.

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Section: Resultsmentioning

confidence: 99%

Chemostratigraphic correlations across the first major trilobite extinction and faunal turnovers between Laurentia and South China

Lin

Sundberg

Jiang

et al. 2019

Sci Rep

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“…Many of the polymerids (including paradoxidids, solenopleurids and conocoryphids) were distributed in deeper, presumably cooler, water, shelf and slope facies (Babcock 1994a, b;Robison 1994). A similar pattern continued through the Furongian Epoch, at which time the more widespread trilobite faunas were dominated by agnostoids, ceratopygids and olenids (Taylor & Cook 1976;Palmer 2005). Slope and/or cool-water facies of the circum-Pacific region share many common taxa among the agnostoids, eodiscids and oryctocephalids (Palmer 2005).…”

Section: Biogeographical Links During Cambrian Epochmentioning

confidence: 91%

“…A similar pattern continued through the Furongian Epoch, at which time the more widespread trilobite faunas were dominated by agnostoids, ceratopygids and olenids (Taylor & Cook 1976;Palmer 2005). Slope and/or cool-water facies of the circum-Pacific region share many common taxa among the agnostoids, eodiscids and oryctocephalids (Palmer 2005). In contrast to the slope and/or cool-water faunas, the predominantly polymerid warmer-water platform faunas show strong provinciality.…”

Section: Biogeographical Links During Cambrian Epochmentioning

confidence: 93%

Chapter 19 Global Cambrian trilobite palaeobiogeography assessed using parsimony analysis of endemicity

Álvaro

Ahlberg

Babcock

et al. 2013

Memoirs

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Palaeobiogeographical data on Cambrian trilobites obtained during the twentieth century are combined in this paper to evaluate palaeoceanographic links throughc.30 myr, once these arthropods biomineralized. Worldwide major tectonostratigraphic units are characterized at series intervals of Cambrian time and datasets of trilobite genera (629 for Cambrian Series 2, 965 for Cambrian Series 3, and 866 for the Furongian Series) are analysed using parsimony analysis of endemicity. Special attention is given to the biogeographical observations made in microcontinents and exotic terranes. The same is done for platform-basinal transects of well-known continental margins. The parsimony analysis of endemicity analysis resulted in distinct palaeogeographical area groupings among the tectonostratigraphic units. With these groupings, several palaeobiogeographical units are distinguished, which do not necessarily fit the previously proposed biogeographical realms and provinces. Their development and spatial distributions are broadly controlled by Cambrian palaeoclimates, palaeogeographical conditions (e.g. carbonate productivity and anoxic conditions) and ocean current circulation.Supplementary material:Global dataset of Cambrian Epoch 2 (A), Cambrian Epoch 3 (B) and the Furongian Epoch (C) trilobite genera are provided at:http://www.geolsoc.org.uk/SUP18669

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“…Eldoradia Resser, 1935, the principal subject of this paper, is endemic to Laurentia. Palmer (2005) noted its similarity with Nepea Xiang & Zhang, 1985 from northern Tianshan, Xinjiang, China, in reviewing the problems of provincial taxonomy within Cambrian trilobite studies, but a close relationship between the two was not supported by Paterson (2005).…”

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confidence: 99%

EldoradiaandAcrocephalops(Trilobita: Bolaspididae) from the middle Cambrian (Miaolingian) of northern Greenland (Laurentia)

Peel

2021

GFF

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The ptychoparioid trilobites Eldoradia and Acrocephalops (Family Bolaspididae) are described from the middle Cambrian (Miaolingian Series) of northern Greenland (Laurentia). Eldoradia, originally described from the Secret Canyon Shale of Nevada, is recorded from southwestern Wulff Land, North Greenland, where it occurs together with Modocia and Olenoides. Eldoradia caerulioris n. sp. is established. The occurrence of Eldoradia in the lower part of the Blue Cliffs Formation indicates a minimum late middle Cambrian age (Miaolingian Series, Guzhangian Stage) for the base of the formation. Type material of Acrocephalops, a relative of Eldoradia originally proposed on the basis of material from the Miaolingian Series (Wuliuan Stage) of Inglefield Land, NorthWest Greenland, is redescribed.

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East-Gondwana/Laurentia trilobite connections—What do they tell us?

Cited by 6 publications

References 6 publications

Chemostratigraphic correlations across the first major trilobite extinction and faunal turnovers between Laurentia and South China

Chemostratigraphic correlations across the first major trilobite extinction and faunal turnovers between Laurentia and South China

Chapter 19 Global Cambrian trilobite palaeobiogeography assessed using parsimony analysis of endemicity

EldoradiaandAcrocephalops(Trilobita: Bolaspididae) from the middle Cambrian (Miaolingian) of northern Greenland (Laurentia)

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