A core drilling through Cambrian strata at Almbacken, Scania, S. Sweden: trilobites and stratigraphical assessment

Axheimer, Niklas; Ahlberg, Per

doi:10.1080/11035890301253139

Cited by 36 publications

(32 citation statements)

References 29 publications

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“…The co-occurrence of T. fissus and P. affinis is not described previously from Scandinavia (cf. Westergård 1946;Axheimer & Ahlberg 2003). It indicates that T. fissus either has a longer range than documented before or that the stinkstone pockets formed in several phases during the A. atavus Zone.…”

Section: Mörbylilla Conglomeratementioning

confidence: 88%

“…This species is characteristic of levels above the T. gibbus Zone and we suspect that the material, which has not been reinvestigated (it could not be located in the collections of the Swedish Geological Survey), rather represents P. aculeata or, perhaps more likely, P. scanica. The latter species has been found in erratics of the Ä leklinta Mbr in northern Germany (Rudolph 1994); in Skåne and Bornholm it occurs in the T. gibbus and A. atavus zones Axheimer & Ahlberg 2003;our observations).…”

Section: Revised Stratigraphymentioning

confidence: 93%

“…3; Westergård 1950;Martinsson 1965). Trace fossils occur abundantly (Martinsson 1965;Schlirf & Bromley 2007), Geyer & Shergold (2000), Axheimer & Ahlberg (2003) and Axheimer et al (2006); see also text for discussion.…”

Section: Articlementioning

confidence: 95%

“…2). The same change in Scandinavian terminology was adopted by Axheimer & Ahlberg (2003) and Weidner & Nielsen (2005; in preparation).…”

Section: Revised Stratigraphymentioning

confidence: 98%

“…A. atavus ranges through the A. atavus Zone and into the basal part of the P. punctuosus Zone(Peng & Robison 2000). In Sweden it is common to abundant in the lower part of the A. atavus Zone but seemingly does not range into the upper part except in Skåne (cf Westergård 1946;Axheimer & Ahlberg 2003;. TW observations).…”

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confidence: 93%

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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: Mörbylilla Conglomeratementioning

confidence: 88%

Section: Revised Stratigraphymentioning

confidence: 93%

Section: Articlementioning

confidence: 95%

“…2). The same change in Scandinavian terminology was adopted by Axheimer & Ahlberg (2003) and Weidner & Nielsen (2005; in preparation).…”

Section: Revised Stratigraphymentioning

confidence: 98%

mentioning

confidence: 93%

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The Middle Cambrian Paradoxides paradoxissimus Superzone on Öland, Sweden

Weidner¹,

Nielsen²

2009

GFF

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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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