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Du, Kunsheng; Bruton, David Lawrence; Yang, Jie & Zhang, Xiguang
(2023).
An early Cambrian Sidneyia (Arthropoda) resolves the century-long debate of its head organization.
Science China. Earth Sciences.
ISSN 1674-7313.
66(3),
s. 521–527.
doi:
10.1007/s11430-022-1019-8.
Vis sammendrag
We report the extraordinarily preserved euarthropod Sidneyia minor sp. nov. from the Cambrian Stage 3 Xiaoshiba Lagerstätte in Yunnan, South China. So far this is the earliest occurrence of the genus. As with other species of Sidneyia, the new taxon shares similar features such as a crescent-shaped head shield with paired lateral notches for stalked eyes, but more significantly and new, is the presence of three pairs of post-antennal appendages beneath the head shield identified by micro CT methods. We conclude that Sidneyia is a sister group to other members of Vicissicaudata within the diverse radiation of Artiopoda.
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Rønning, K.J; Bruton, David Lawrence; Harper, A.T; Høyberget, Magne; Maletz, J & Nakrem, Hans Arne
(2020).
A Cambrian–Ordovician boundary section in the Rafnes–Herøya submarine tunnel,
Skien–Langesund District, southern Norway
.
Norwegian Journal of Geology.
ISSN 2387-5844.
100(15).
doi:
10.17850/njg100-3-3.
Vis sammendrag
Rock specimens and contained fossils collected in 1976 from a submarine tunnel driven between Herøya and Rafnes in the Skien–Langesund area of southern Norway, have been restudied. The contained fossils include olenid and agnostoid trilobites, graptolites and brachiopods, groups described in detail for the first time from the area and documenting a Cambrian–Ordovician boundary section unique in the district where the upper Cambrian Alum Shale Formation is elsewhere overlain by the Middle Ordovician Rognstranda Member of the Huk Formation (Kundan in terms of Baltoscandian chronostratigraphy). The hiatus at the base of the Huk Formation is thus smaller in the section described herein, beginning at a level within rather than below the Tremadocian. Estimated thickness of the Alum Shale includes 10–12 m of Miaolingian and 20–22 m of Furongian strata with trilobite zones identified, and a Tremadocian section of 8.1 m identified by species of the graptolite Rhabdinopora in the basal 2.6 m and Bryograptus ramosus at the top. The Tremadocian section is preserved in a postulated zone of synsedimentary subsidence along the Porsgrunn–Kristiansand Fault Zone, while at the same time there was extensive erosion across an emergent, level platform elsewhere in the Skien–Langesund District and the southern part of the Eiker–Sandsvær District to the north. Aspects of stratigraphy and tectonics are highlighted together with a discussion on the Cambrian–Ordovician boundary locally and worldwide.
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Schovsbo, Niels Hemmingsen; Nielsen, Arne Thorshøj; Harstad, Andreas Olaus & Bruton, David Lawrence
(2018).
Stratigraphy and geochemical composition of the Cambrian Alum Shale Formation in the Porsgrunn core, Skien–Langesund district, southern Norway.
Bulletin of the Geological Society of Denmark.
ISSN 0011-6297.
66,
s. 1–20.
Fulltekst i vitenarkiv
Vis sammendrag
The fully cored BHD-03-99 borehole (hereafter referred to as the Porsgrunn borehole and core) penetrated Ordovician and Cambrian strata in the Skien–Langesund district, southern part of the Oslo region in Norway. Hand-held X-ray fluorescence (HH-XRF) measurements combined with spectral gamma ray and density core scanning of the Middle Cambrian – Furongian Alum Shale Formation have been made and compared with similar measurements obtained on Alum Shale cores from Scania (southernmost Sweden) and Bornholm (Denmark). The Porsgrunn drill site is located in an area that was only mildly
overprinted by Caledonian tectonics and represents one of the few sites in the Oslo area where a nearly untectonised sedimentary succession can be studied in terms of thickness and geochemistry. The Alum Shale Formation is 28.8 m thick in the Porsgrunn core, excluding the thickness of five 0.9–5.5 m thick dolerite sills of assumed Permian age. In the Alum Shale Formation the bulk densities are around 2.7 g/cm3 with a slightly decreasing trend up through the formation. The shale has total organic carbon (TOC) values up to 14 wt%, which is comparable to the TOC levels for the Alum Shale elsewhere in the Oslo area and for dry gas matured Alum Shale in Scania and Bornholm. The basal Furongian is characterised by a gamma ray low and an increase in Mo interpreted to reflect the Steptoean Positive Carbon Isotope Excursion (SPICE) event. The Porsgrunn core data suggest that the Mo concentration remained high also after the SPICE event. Characteristic, readily identified features in the gamma log motif are named the Andrarum gamma low (AGL), base Furongian gamma low (BFGL), Olenus triple gamma spike (OTGS) and the Peltura gamma spike (PGS). No Lower Ordovician Alum Shale is present. The 14.8 m thick Furongian part of the Alum Shale represents the Olenus, Parabolina, Leptoplastus, Protopeltura and Peltura trilobite superzones judging from log-stratigraphic correlations to Scania and Bornholm. The Middle Cambrian interval is 14.0 m thick and includes the Exsulans Limestone Bed and 1.4 m of quartz sandstone. A 0.3 m thick primary limestone bed may be an equivalent to the Andrarum Limestone Bed. The succession represents the Paradoxides paradoxissimus and P. forchhammeri superzones. The Alum Shale Formation rests atop the 13.0 m thick Lower Cambrian Stokkevannet sandstone (new informal name) that in turn directly overlies the basement. Overall, the stratigraphic development of the comparatively thin Alum Shale Formation resembles the condensed sequence seen on Bornholm.
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Bergström, Stig M.; Bruton, David Lawrence; Schmitz, Birger & Terfelt, Fredrik
(2017).
Local and trans-Atlantic chemostratigraphic significance of new δ13Ccarb data from the Sandbian and Katian Stages (Middle–Upper Ordovician) of the Oslo region, Norway.
GFF.
ISSN 1103-5897.
139(4),
s. 289–300.
doi:
10.1080/11035897.2017.1389983.
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Owen, Alan W. & Bruton, David Lawrence
(2012).
The only known cyclopygid-'atheloptic' trilobite fauna from North America: the upper Ordovician fauna of the Pyle Mountain Argillite and its palaeoenvironmental significance.
Geological Magazine.
ISSN 0016-7568.
149(6),
s. 964–988.
doi:
10.1017/S0016756812000015.
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Bergstrøm, Stig M.; Birger, Schmitz; Young, Seth A. & Bruton, David Lawrence
(2011).
Lower Katian (Upper Ordovician)δ13C chemostratigraphy, global correlation and sea-level changes in Baltoscandia.
GFF.
ISSN 1103-5897.
133(1-2),
s. 31–47.
doi:
10.1080/11035897.2011.557162.
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Bergström, Stig M.; Schmitz, Birger; Young, Seth A. & Bruton, David Lawrence
(2010).
The delta C-13 chemostratigraphy of the Upper Ordovician Mjosa Formation at Furuberget near Hamar, southeastern Norway: Baltic, Trans-Atlantic, and Chinese relations.
Norsk Geologisk Tidsskrift.
ISSN 0029-196X.
90(1-2),
s. 65–78.
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Bruton, David Lawrence; Gabrielsen, Roy H. & Larsen, Bjørn T.
(2010).
The Caledonides of the Oslo Region, Norway - stratigraphy and structural elements.
Norsk Geologisk Tidsskrift.
ISSN 0029-196X.
90(3),
s. 93–121.
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Bruton, David Lawrence
(2009).
Early evolution of multi-cellular life.
I Nakrem, Hans Arne (Red.),
Vinterkonferansen 2009 : Radisson SAS hotel Norge, Bergen 13-15 January 2009.
Norsk Geologisk Forening.
ISSN 978-82-92394-48-9.
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Bruton, David Lawrence
(2009).
One hundred years with The Burgess Shale.
I Nakrem, Hans Arne (Red.),
Vinterkonferansen 2009 : Radisson SAS hotel Norge, Bergen 13-15 January 2009.
Norsk Geologisk Forening.
ISSN 978-82-92394-48-9.
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Bruton, David Lawrence
(2009).
The Cambridge-Geological Survey of Canada excavation of the Walcott Quarry in 1967.
I Smith, Martin; O'Brien, Lorna & Caron, Jean-Bernard (Red.),
International Conference on the Cambrian Explosion. Walcott 2009. Abstract Volume.
International Conference on the Cambrian Explosion..
s. 22–22.
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Bruton, David Lawrence
(2009).
Ordovician life around the Celtic fringes: diversifications, extinctions and migrations of brachiopod and trilobite faunas at middle latitudes.
Geological Society Special Publication.
ISSN 0305-8719.
325,
s. 157–170.
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Høyberget, Magne & Bruton, David Lawrence
(2008).
Middle Cambrian trilobites of the suborders Agnostina and Eodiscina from the Oslo Region, Norway.
Palaeontographica. Abteilung A, Palaozoologie, Stratigraphie.
ISSN 0375-0442.
286,
s. 1–87.
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Owen, Alan W. & Bruton, David Lawrence
(2008).
The environmental significance and fate of the trilobite fauna of the Pyle Mountain argillite (Upper Ordovican), Maine.
I Rabano, I; Gozalo, R & Garcia-Bellido, D (Red.),
Advances in trilobite research. Cuadernos del Museo Geominero , no 9.
Instituto Geologico y Minero de Espana.
ISSN 978-84-7840-759-0.
s. 283–287.
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Harper, D.A.T.; Bruton, David Lawrence & Rasmussen, MaCørum
(2008).
The Otta brachiopod and trilobite fuana: palaeogeography of Early Palaeozoic terranes and biotas across Baltoscandia.
Fossils and Strata.
ISSN 0300-9491.
54,
s. 31–40.
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Maletz, J & Bruton, David Lawrence
(2008).
The Middle Ordovician Proventocitum procerulum radiolarian assemblage of Spitsbergen and its biostratigraphic correlation.
Palaeontology.
ISSN 0031-0239.
51,
s. 1181–1200.
doi:
10.1111/j.1475-4983.2008.00803.x.
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Bruton, David Lawrence
(2008).
A systematic revision of Selenopeltis (Trilobita : Odontopleuridae) with description of new material from the Ordovician Anti Atlas region, Morocco.
Palaeontologische Zeitschrift.
ISSN 0031-0220.
82.
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Hurum, Jørn Harald & Bruton, David Lawrence
(2006).
Livet i Prekambrium.
I Ramberg, Ivar; Bryhni, Inge & Nøttvedt, Arvid (Red.),
Landet blir til. Norges geologi.
Norsk Geologisk Forening.
ISSN 82-92394-31-1.
s. 69–69.
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Bruton, David L & Nakrem, Hans Arne
(2005).
Enrolment in a Middle Ordovician agnostoid trilobite.
Acta Palaeontologica Polonica.
ISSN 0567-7920.
50,
s. 441–448.
Vis sammendrag
Study of silicified material of Trinodus elspethi, from the Edinburg Formation, Virginia, USA, shows there is no gliding of distal parts of segments but an articulating furrow and opposing flange with prongs, acting as apodemes for muscle attachment, allowed cephalon and thorax to move as a single unit. Articulation between thorax and pygidium was more rigid with prongs from the thorax articulating in sockets on the pygidium. Support is given to the view that agnostoids lived partially enrolled with cephalon and pygidium gaping. They are unique in lacking an articulating half−ring between cephalon and thorax and the hinge joint is modified medially to provide an opening for what is interpreted as an exhalatory organ through which water passed during feeding and swimming. Peculiarities of the thorax are connected with the presence of only two thoracic segments articulating as a unit with distal tips directed anteriorly rather than posteriorly. Otherwise articulating half rings are present in the rest of the thorax and pygidium and lack of articulating facets is not unique. It is concluded that agnostoids can be shown to be trilobites.
Key words : Trilobita, Agnostida, life habit, preservation, Edinburg Formation, Ordovician, Virginia.
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Hansen, Thomas; Bruton, David L & Jacobsen, Sten L.
(2005).
Starfish from the Ordovician of the Oslo Region, Norway.
Norsk Geologisk Tidsskrift.
ISSN 0029-196X.
85(3),
s. 209–216.
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Maletz, Jörg & Bruton, David L
(2005).
The Beothuka terranova (Radiolaria) assemblage and its importance for the understanding of early Ordovician radiolarian evolution.
Geological Magazine.
ISSN 0016-7568.
142(6),
s. 1–11.
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Gabrielsen, RH; Bruton, David Lawrence; Bryhni, Inge & Ramberg, IB
(2005).
On the shoulders of giants - Musings on the history of geoscience in Norway.
Norsk Geologisk Tidsskrift.
ISSN 0029-196X.
85.
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Bruton, David L
(2004).
Blekkspruter.
I Hurum, Jørn & Frøyland, Merethe (Red.),
Nedre Eikers underjordiske skatter.
Nedre Eiker kommune.
ISSN 82-994647-1-4.
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Bruton, David L
(2004).
Brachiopoder.
I Hurum, Jørn & Frøyland, Merethe (Red.),
Nedre Eikers underjordiske skatter.
Nedre Eiker kommune.
ISSN 82-994647-1-4.
s. 64–65.
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Bruton, David L
(2004).
Koraller.
I Hurum, Jørn & Frøyland, Merethe (Red.),
Nedre Eikers underjordiske skatter.
Nedre Eiker kommune.
ISSN 82-994647-1-4.
s. 66–67.
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Bruton, David L
(2004).
Trilobitter.
I Hurum, Jørn & Frøyland, Merethe (Red.),
Nedre Eikers underjordiske skatter.
Nedre Eiker kommune.
ISSN 82-994647-1-4.
s. 68–69.
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Bruton, David L; Wright, A. J. & Hamedi, M. A.
(2004).
Ordovician trilobites from Iran.
Palaeontographica. Abteilung A, Palaozoologie, Stratigraphie.
ISSN 0375-0442.
271,
s. 111–149.
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Bruton, David L & Haas, Winfried
(2003).
Making Phacops come alive.
Special Papers in Palaeontology.
ISSN 0038-6804.
70,
s. 331–347.
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Bruton, David L & Haas, Winfried
(2003).
The puzzling eye of Phacops.
Special Papers in Palaeontology.
ISSN 0038-6804.
70,
s. 349–361.
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Tongiorgi, M.; Bruton, David L & Di Milia, A
(2003).
Taxonomic composition and palaeobiogeographic significance of the acritarch assemblages from the Tremadoc-Arenig (Hunneberg,Billingen and lower Volkhov Stages) of the Oslo Region.
Collana di Studi Paleontologici.
42(3),
s. 205–235.
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Bruton, David L
(2001).
Waldemar Christopher Brøgger (1851-1940).
Trilobite Papers Thirteen.
s. 7–9.
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Bruton, David L
(2000).
Valdar Jaanusson 1923-1999.
I Ludvigsen, R. (Red.),
The Trilobite Papers Twelve.
Denman Institute of Research on Trilobites.
s. 10–12.
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Bruton, David L & Harper, David A.T.
(2000).
A mid-Cambrian shelly fauna from Ritland, western Norway and its palaeontological implications.
Bulletin of the Geological Society of Denmark.
ISSN 0011-6297.
47,
s. 29–51.
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Ribecai, C.; Bruton, David L & Tongiorgi, M.
(2000).
Acritarchs from the Ordovician of the Oslo Region, Norway.
Norsk Geologisk Tidsskrift.
ISSN 0029-196X.
80.
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Bruton, David L & Harper, David A.T.
(2000).
A mid-Cambrian shelly fauna from Ritland, western Norway and its palaeogeographical implications.
Bulletin of the Geological Society of Denmark.
ISSN 0011-6297.
47,
s. 29–51-.
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Bruton, David L & Haas, Winfried
(1999).
The anatomy and functional morphology of Phacops (Trilobita) from the Hunsrück Slate (Devonian).
Palaeontographica. Abteilung A, Palaozoologie, Stratigraphie.
ISSN 0375-0442.
253,
s. 29–75.
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Bruton, David L
(1999).
Permian trilobites from Akseløya, Svalbard.
Geologica et palaeontologica.
ISSN 0072-1018.
33,
s. 191–201.
Vis sammendrag
Complete and moulted specimens of Paladin(Neokaskia)borealis KOBAYASHI,1987 are described together with pygidia of Ditomopyge sp. and an unidentified proetine. Also figured for comparison is a specimen of Paldin (N) sp. from the Permian of N.E.Oman. The Svalbard material is from the Kapp Starostin Formation. Comparison with material from the Timor and North America (Yukon and Ellesmere Island), suggests ages of Artinskian-Kazanian for the upper part of this unit although an associated fauna and flora suggests the age to be Ufimian or possibly Kazanian
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Bruton, David L
(1999).
Notes on Brøgger's type species of agnostid trilobite genera.
GFF.
ISSN 1103-5897.
121,
s. 337–341.
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Bruton, David L
(1998).
25 years ago: The first international trilobite conference.
I Ludvigsen, R. (Red.),
The Trilobite Papers 10.
Denman Institute for research on trilobites.
s. 11–14.
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Bruton, David L
(1998).
Gunnar Henningsmoen (1919-1996).
I Ludvigsen, R. (Red.),
The Trilobite Papers 10.
Denman Institute for resaerch on trilobites.
s. 36–37.
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