Middle Cambrian trilobites of the suborders Agnostina and Eodiscina from the Oslo Region, Norway

Høyberget, Magne; Bruton, David L.

doi:10.1127/pala/286/2008/1

Cited by 36 publications

(79 citation statements)

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“…Confidently separating juvenile pygidia of the A. atavus-P. affinis group is not possible and we regard A. koelleri as a likely synonym of A. atavus (see also Høyberget & Bruton 2008). Small specimens, like the ones listed as A. koelleri by Buchholz (1997), occur frequently in the Mörbylilla conglomerate associated with adult specimens of A. atavus and P. affinis.…”

Section: Systematic Palaeontologymentioning

confidence: 92%

“…For alternative interpretations, see e.g. Robison (1994Robison ( , 1995, Peng & Robison (2000), Ahlberg et al (2007) and Høyberget & Bruton (2008).…”

Section: Systematic Palaeontologymentioning

confidence: 95%

“…For a more complete list of synonymy, see Høyberget & Bruton (2008), except that we have a different interpretation of Acidusus sterleyi Rudolph, 1994 (here regarded as a synonym of A. atavus). Material and occurrence.…”

Section: Systematic Palaeontologymentioning

confidence: 98%

“…The species is also known from glacial erratic boulders of the same conglomerate (Buchholz 1997). In Scandinavia, P. affinis has a range from the upper part of the A. atavus Zone to the P. punctuosus Zone (Westergård 1946;Høyberget & Bruton 2008 (Brøgger), Robison, pp. 51-54, figs 30 -31.…”

Section: Systematic Palaeontologymentioning

confidence: 98%

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The Middle Cambrian Paradoxides paradoxissimus Superzone on Öland, Sweden

Weidner¹,

Nielsen²

2009

GFF

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Trilobites from the Middle Cambrian Paradoxides paradoxissimus Superzone on Ö land are reviewed, including species found in glacial erratic boulders in Germany and Denmark. The fauna recorded contains 20 species including 10 agnostids. The succession, up to 70 m thick, comprises the Ä leklinta Member of the Borgholm Formation (previously known as the Paradoxissimus sandstone or siltstone) and a thin overlying conglomerate, here informally referred to as the Mörbylilla conglomerate, forming the base of the Alum Shale Formation. The thin Granulata Conglomerate, including a limestone layer previously correlated with the Exsulans Limestone, forms the base of the Ä leklinta Member. It has yielded several species characteristic of the Triplagnostus gibbus Zone, e.g. Ctenocephalus exsulans, Bailiella tenuicincta, Solenopleura parva, Parasolenopleura aculeata and T. gibbus. The Ä leklinta Member contains T. gibbus, Ellipsocephalus lejostracus and P. aculeata, all indicative of the T. gibbus Zone. The overlying Mörbylilla conglomerate contains reworked (?) specimens of E. lejostracus and T. gibbus associated with Acidusus atavus, Tomagnostus fissus, Ptychagnostus affinis, Onymagnostus hybridus, Tomagnostella cf. truncata, Hypagnostus parvifrons and H. mammillatus. Most of these agnostids are found in small stinkstone pockets within the conglomerate. Tomagnostus bothrus? is recorded in Scandinavia for the first time. The fauna shows that the conglomerate represents the A. atavus Zone. The stinkstone pockets indicate that the conglomerate was deposited under dysoxic "Alum Shale" conditions. In the beach section at Mörbylilla, the 0.16 m thick Mörbylilla conglomerate is overlain by an anthraconite bed, up to 0.6 m thick, representing the Exporrecta Conglomerate Bed.

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Section: Systematic Palaeontologymentioning

confidence: 92%

“…For alternative interpretations, see e.g. Robison (1994Robison ( , 1995, Peng & Robison (2000), Ahlberg et al (2007) and Høyberget & Bruton (2008).…”

Section: Systematic Palaeontologymentioning

confidence: 95%

Section: Systematic Palaeontologymentioning

confidence: 98%

Section: Systematic Palaeontologymentioning

confidence: 98%

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The Middle Cambrian Paradoxides paradoxissimus Superzone on Öland, Sweden

Weidner¹,

Nielsen²

2009

GFF

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“…Its FAD is recorded in the base of Ptychagnostus atavus Zone (Peng & Robison 2000), thus its presence in the base of Pardailhania hispida Zone indicates that the oldest age for this zone would be Drumian. d) Peronopsis segmenta (Figs 6A-C, 7) has been recorded only in the eastern Great Basin (Robison 1964(Robison , 1982(Robison , 1984 zones (Fatka et al 2004); in Sweden and Norway, Hypagnostus parvifrons Zone (Westergård 1946) or top of Ptychagnostus atavus Zone sensu Høyberget & Bruton (2008); in Warwickshire, England, it occurs in the hicksii Zone (Illing 1916;Fletcher 2007, fig. 2) in beds equivalent to the Ptychagnostus gibbus and Tomagnostus fissus zones (Rushton 1979, Thomas et al 1984; in Spain, Pardailhania hispida to Solenopleuropsis thorali zones (Sdzuy 1961, Liñán & Gozalo 1986, Chirivella Martorell 2008; in France, level B (Courtessole 1973) equivalent to Solenopleuropsis ribeiroi Zone (Álvaro & Vizcaïno 1998); in Eastern Newfoundland, Paradoxides hicksii and (Thoral, 1935), latex cast, MPZ 3078 and 3079 (specimens figured by Liñán & Gozalo 1986, pl.…”

Section: Correlation Between the Base Of The Drumian Stage And The Bamentioning

confidence: 99%

Correlation between the base of Drumian Stage and the base of middle Caesaraugustan Stage in the Iberian Chains (NE Spain)

Gutiérrez¹,

Martorell²,

Esteve³

et al. 2011

Bull. Geosci.

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Biostratigraphy and taxonomy of Drumian (middle Cambrian) agnostid trilobites of the Manuels River Formation, Avalonian Newfoundland, Canada

Hildenbrand

Austermann

Ifrim

et al. 2021

Papers in Palaeontology

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New, accurately located and well-preserved agnostid trilobite material has been collected from the type locality of the Drumian (middle Cambrian, Miaolingian) Manuels River Formation, Newfoundland, Canada. The wellexposed grey to black shales containing the fauna were deposited on the former microcontinent Avalonia. Four interval zones for the succession are proposed, namely, the Tomagnostus fissus, Hypagnostus parvifrons, Ptychagnostus atavus and Ptychagnostus punctuosus zones. The Tomagnostus fissus and Ptychagnostus atavus zones are distinct from each other, which leads to a significantly shorter and stratigraphically higher Ptychagnostus atavus Zone compared with other sections (Scandinavia, South China, Utah and Nevada, Greenland). Specimens of Ptychagnostus atavus, however, occur abundantly, with 107 specimens identified in a short interval of the succession. The Ptychagnostus punctuosus Zone can be correlated globally. The faunal assemblage is comparable to that of Scandinavia, Greenland and England. Ptychagnostus affinis is recorded for the first time from Avalonia. The 1408 collected specimens were assigned to the suborders Agnostina and Eodiscina and to the families Peronopsidae and Ptychagnostidae, and Condylopygidae and Eodiscidae, respectively, with the following species: Peronopsis fallax (Linnarsson), Peronopsis scutalis (Hicks), Hypagnostus parvifrons (Linnarsson), Ptychagnostus punctuosus (Angelin), Ptychagnostus affinis (Brøgger), Ptychagnostus atavus (Tullberg), Tomagnostus fissus (Lundgren), Tomagnostus perrugatus (Gr€ onwall), Pleuroctenium granulatum (Barrande) and Eodiscus punctatus (Salter).

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Middle Cambrian trilobites of the suborders Agnostina and Eodiscina from the Oslo Region, Norway

Cited by 36 publications

References 0 publications

The Middle Cambrian Paradoxides paradoxissimus Superzone on Öland, Sweden

The Middle Cambrian Paradoxides paradoxissimus Superzone on Öland, Sweden

Correlation between the base of Drumian Stage and the base of middle Caesaraugustan Stage in the Iberian Chains (NE Spain)

Biostratigraphy and taxonomy of Drumian (middle Cambrian) agnostid trilobites of the Manuels River Formation, Avalonian Newfoundland, Canada

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