Ptychopariid trilobites of the Lower-Middle Cambrian boundary interval, Pioche Shale, southeastern Nevada

Sundberg, Frederick A.; McCollum, Linda B.

doi:10.1017/s0022336000032741

Cited by 36 publications

(76 citation statements)

References 8 publications

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“…1). The Dyeran-Delamaran boundary interval is represented by the Pioche Formation (Arcuolenellus arcuatus-Mexicella mexicana zones; Sundberg and McCollum, 2000;Sundberg, 2011;Webster, 2011a, c;Fig. 2).…”

Section: General Geology and Stratigraphymentioning

confidence: 99%

“…The base of the Delamaran starts with the Comet Shale Member (Eokochaspis nodosa-Amecephalus arrojoensis zones; Fig. 2), predominated by claystone and siltstone with a few thin limestone beds (Sundberg and McCollum, 2000;. It is disconformably overlain by the Susan Duster Limestone Member (Amecephalus arrojoensis-Poliella denticulata zones), which consists of a basal bioclastic limestone, an interval of claystone and nodular limestone, and an upper part of nodular-bedded limestone (Sundberg and McCollum, 2003b;Sundberg, 2011).…”

Section: General Geology and Stratigraphymentioning

confidence: 99%

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Small shelly fossils from the Montezuman–Delamaran of the Great Basin in Nevada and California

Wotte¹,

Sundberg²

2017

J. Paleontol.

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Section: General Geology and Stratigraphymentioning

confidence: 99%

Section: General Geology and Stratigraphymentioning

confidence: 99%

Small shelly fossils from the Montezuman–Delamaran of the Great Basin in Nevada and California

Wotte¹,

Sundberg²

2017

J. Paleontol.

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“…It was identified only from the latest Dyeran Combined Metals Member with certainty, where it more or less co-occurs with Bathynotus (originally identified as B. holopygus (Hall, 1859) and revised to B. granulatus Lermontova, 1940 or regarded as undeterminable by Webster 2009), various species of olenellids, Crassifimbra walcotti (Resser, 1937), Crassifimbra? metalaspis (Sundberg & McCollum, 2000), and Oryctocephalites palmeri Sundberg & McCollum, 1997. In the Freuchen Land section Zacanthopsis blakeri sp.…”

Section: F J)mentioning

confidence: 99%

“…Eokochaspis piochensis (Palmer & Halley, 1979), originally described as Eoptychoparia piochensis, from the C-Shale Member of the Pioche Formation (PlagiuraPoliella "Zone", basal Delamaran) of the Highland Range, Nevada, is based on imperfectly preserved type material, but has been subsequently described from the Eokochaspis nodosa Zone at the base of the Emigrant Formation of the Last Chance Range, eastern California (McCollum & Sundberg 2007), the Comet Shale Member of the Pioche Formation in the Highland Range, Chief Range and Delamar Mountains, eastern Nevada (Sundberg & McCollum 2000), and probably the Emigrant Formation of Split Mountain, western Nevada (Sundberg & McCollum 2003). The glabella of Eokochaspis piochensis is certainly much more conical in outline than that of E. pearylandica and relatively slender, as it is characteristic for the species of Eokochaspis.…”

Section: Eoptychoparia Pearylandica Sp Novmentioning

confidence: 99%

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The Henson Gletscher Formation, North Greenland, and its bearing on the global Cambrian Series 2–Series 3 boundary

Geyer¹,

Peel²

2011

Bull. Geosci.

130

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The Henson Gletscher Formation of North Greenland yields moderately diverse trilobite faunas which bracket the Cambrian Series 2-Series 3 boundary interval. A number of the trilobite taxa permit correlation into other parts of Laurentia and to other Cambrian continents, thus enhancing correlation within this stratigraphical interval of the traditional Lower-Middle Cambrian boundary. In particular, the occurrence of Ovatoryctocara granulata and O. yaxiensis substantially improves the intercontinental recognition of the O. granulata level, a prime GSSP candidate. In contrast, the level with Oryctocephalus indicus cannot be located in a number of Cambrian continents with sufficient precision, making this level unsuitable for the definition of a GSSP for the base of the Cambrian Series 3 and Stage 5. Further support for the correlation potential of the base of the range of Ovatoryctocara granulata comes from recent carbon isotope studies that indicate a striking negative excursion in sections of South China (ROECE event) that probably coincides with similar excursions in Laurentia. Four new trilobite species are described: Zacanthopsis blakeri sp. nov., Protoryctocephalus arcticus sp. nov., Eoptychoparia pearylandica sp. nov. and Onchocephalus? freucheni sp. nov.

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Proposal of a reference section and point for the Cambrian Series 2–3 boundary in the Mediterranean subprovince in Murero (NE Spain) and its intercontinental correlation

et al. 2011

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The classical lower-middle Cambrian boundary is approximately equivalent with the boundary of the Cambrian Series 2 and 3, which is now in the process of definition by the International Subcommission on Cambrian Stratigraphy. Currently, there are two oryctocephalid trilobite species first appearance data (FAD) that are suggested as possible markers of this level: Ovatoryctocara granulata Tchernysheva, 1962 and Oryctocephalus indicus (Reed, 1910), respectively. Until now neither of these two species has been recorded in the Mediterranean subprovince or Baltica. As a result, in these regions a level potentially correlating with either the FAD of Ovatoryctocara granulata or Oryctocephalus indicus has to be located using the available bio-, isotope-, and event-stratigraphy data.Carbon isotope signatures reveal global oceanic perturbations adjacent to the Cambrian Series 2 and Series 3 (former lower-middle Cambrian) boundary. This event, first called the Valdemiedes Event (it was defined in Murero, NE Spain; Liñán et al., 1993a), caused a noticeable extinction of trilobites, mostly olenellids and protolenids (which were replaced in some regions by paradoxidids), as well as an almost complete extermination of some other early Cambrian marine animals. Both isotope and palaeontological evidence show that the disappearance of olenellids in Laurentia, protolenids in Siberia and the appearance of the first Acadoparadoxides in Western Gondwana, Baltica, Avalonia, and Siberia, which was formerly thought to be a series of diachronous regional perturbations, were nearly contemporaneous events. Features of a global ecological crisis and faunal replacement being taken together with a pronounced global d 13 C org negative excursion would serve as the best indicator of the lower boundary of the Cambrian Series 3 and Stage 5 in the Mediterranean subprovince and is correlatable with the Ovatoryctocara granulata FAD. Another d 13 C org negative excursion followed by a positive shift occurs at a slightly younger level, which coincides with a transgression maximum and roughly is coeval with the Oryctocephalus indicus FAD, also proposed as a possible base of the Cambrian Series 3.

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Ptychopariid trilobites of the Lower-Middle Cambrian boundary interval, Pioche Shale, southeastern Nevada

Cited by 36 publications

References 8 publications

Small shelly fossils from the Montezuman–Delamaran of the Great Basin in Nevada and California

Small shelly fossils from the Montezuman–Delamaran of the Great Basin in Nevada and California

The Henson Gletscher Formation, North Greenland, and its bearing on the global Cambrian Series 2–Series 3 boundary

Proposal of a reference section and point for the Cambrian Series 2–3 boundary in the Mediterranean subprovince in Murero (NE Spain) and its intercontinental correlation

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