Geologic Time Scale 2020 2020
DOI: 10.1016/b978-0-12-824360-2.00019-x
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The Cambrian Period

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Cited by 76 publications
(42 citation statements)
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“…2B); retrospectively, at least three carbon isotope excursions, which probably represent the Cambrian arthropod radiation isotope excursion (CARE), Mingxinsi carbon isotope excursion (MICE), and D r a f t 7 archaeocyathan extinction isotope excursion (AECE), are identifiable in the Sekwi Formation (Fig. 2A;Geyer, 2019;Peng et al, 2020;Cramer and Jarvis, 2020). The redlichiid-olenellid extinction isotope excursion (ROECE) may be partly expressed in Section 4 of Dilliard et al (2007), which, unlike the type section (section 10), has an intact upper contact that is not compromised by faulting or post-Sekwi exposure in the vicinity of the Mackenzie-Redstone arch [Dilliard et al 2007 (fig.…”
Section: Biostratigraphymentioning
confidence: 99%
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“…2B); retrospectively, at least three carbon isotope excursions, which probably represent the Cambrian arthropod radiation isotope excursion (CARE), Mingxinsi carbon isotope excursion (MICE), and D r a f t 7 archaeocyathan extinction isotope excursion (AECE), are identifiable in the Sekwi Formation (Fig. 2A;Geyer, 2019;Peng et al, 2020;Cramer and Jarvis, 2020). The redlichiid-olenellid extinction isotope excursion (ROECE) may be partly expressed in Section 4 of Dilliard et al (2007), which, unlike the type section (section 10), has an intact upper contact that is not compromised by faulting or post-Sekwi exposure in the vicinity of the Mackenzie-Redstone arch [Dilliard et al 2007 (fig.…”
Section: Biostratigraphymentioning
confidence: 99%
“…The current regional lower Cambrian trilobite biostratigraphic scheme for Laurentia consists of the Fritzaspis, Fallotaspis, Nevadella, and Bonnia-Olenellus zones (Fritz, 1972;Hollingsworth, 2007). These biozones are defined by trilobite genera and span Cambrian stages 3 and 4, comprising what was traditionally known as the trilobite-bearing lower Cambrian (e.g., Peng et al 2020;Geyer 2019). Although the modern lower Cambrian trilobite biozones of Laurentia have been widely used for decades, there are issues with their utility.…”
Section: Lower Cambrian (Stages 3 and 4) Biostratigraphy Of Laurentiamentioning
confidence: 99%
“…Approximately 300 m above the base of the Middle Member, archaeocyathid reefs and hash can be observed in bioturbation-free zones (Fig. 4F), constraining the strata to a window of the early Cambrian between the Tommotian and Toyonian Stages (~525-511 Ma, or mid-Terreneuvian Age 2 to Cambrian Series 2, Age 4; Peng et al, 2020). The Middle Member of the Erkhelnuur Formation ranges from 600-800 m thick, and is best exposed in sections EA1801-1802 (see Fig.…”
Section: Middle Membermentioning
confidence: 99%
“…This is especially true in shale deposits (e.g., Hollingsworth, 2005;McCollum and McCollum, 2011;Webster, 2011a, b, c, d;Webster et al, 2011), but less so in carbonates in which pagetiids, ptychoparioids and corynexochines can be locally abundant (e.g., Fritz, 1972;Hopkins and Webster, 2009;Geyer and Peel, 2011;Webster, 2011a, e). Whereas the endemic olenelline trilobites have become the major focus for biostratigraphic correlation of Series 2 strata in Laurentia, corynexochines-especially the oryctocephalids-have the potential to allow international correlations (e.g., Sundberg and McCollum, 1997;Sundberg et al, 1999Sundberg et al, , 2016Fletcher, 2001Fletcher, , 2003Fletcher, , 2007Zhao et al, 2001;Geyer and Peel, 2011;Lin et al, 2019;Peng et al, 2020).…”
Section: Introductionmentioning
confidence: 99%