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New Emsian conodont zonation (Lower Devonian)

01 Jan 1994-Vol. 168, pp 139-157
About: The article was published on 1994-01-01 and is currently open access. It has received 55 citations till now. The article focuses on the topics: Conodont & Devonian.
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Book ChapterDOI
01 Jan 1996
TL;DR: In this article, Devonian and Carboniferous global events are described and their magnitude ranges from short-termed geo-events without major biotic changes up to highest order mass-extinctin events.
Abstract: Devonian and Carboniferous global events are described. Their magnitude ranges from short-termed geo-events without major biotic changes up to highest order mass-extinctin events. All bio-events are proximately caused by environmental changes such as anoxic episodes and/or sea-level changes.

332 citations

Journal ArticleDOI
TL;DR: In this article, the authors proposed a time-linear biostratigraphic scale for the interpolation between the isotopic ages of the Devonian chronology, which represents a "biochronometric" time scale, which allows the assignment of numeric ages not only to stage boundaries but also to each biozone boundary.

197 citations


Cites background or methods from "New Emsian conodont zonation (Lower..."

  • ...Composite I, a compilation of the conodonts first occurrences in Nevada (Murphy, 2000) and the Zinzilban section (Yolkin et al., 1994)....

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  • ...The scale of the composite is adopted and extended from the Zinzilban section (Yolkin et al., 1994)....

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  • ...Composite II, a compilation of the Zinzilban section (Yolkin et al., 1994) and the Devonian Correlation Table (Weddige, 1996: p....

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  • ..., 1988) Mid-Eifelian to basal G (costatus to hemiansatu Tizi n' Ikiouâch, Anti-Atlas (Bultynck, 1985) Uppermost Emsian to m (patulus to costatus Zon Zinzilban, Uzbekistan (Yolkin et al., 1994) Basal to mid-Emsian (kitabicus to serotinus Z Nevada, USA (Murphy, 2000) Uppermost Pridolian to (hesperius to kitabicus, biozones of equal length, an approach which, though convenient, lacks justification (Fordham, 1992)....

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Book ChapterDOI
01 Jan 2012

113 citations

Journal ArticleDOI
TL;DR: The conodont-based biochronology of the Devonian Period is calibrated in this article on the basis of a recent, reliable radiometric dating (Claoue-Long et al. 1992) of a stratigraphic position just above the devonian-Carboniferous boundary.
Abstract: The conodont-based biochronology of the Devonian Period is calibrated herein on the basis of: (1) a recent, reliable radiometric dating (Claoue-Long et al. 1992) of a stratigraphic position just above the Devonian-Carboniferous boundary; and (2) new calculations of stage durations based on our estimates and those of a large number of other Devonian workers, which pertain to many stratigraphic sequences in several different paleotectonic settings globally. Using these tools we maintain the 46-m.y. duration for the Devonian Period given by the recent global timescale (GTS 89) ofHarland et al. (1990). The main changes to GTS 89 are accomplished by raising the dating of the end of the Devonian by 9 m.y. from 363 Ma to 354 Ma and considerably shortening the bizarre estimate given by GTS 89 for the length of the oldest two Early Devonian stages. We reiterate our earlier expose (Ziegler & Sandberg 1994) of the inaccuracies and misestimates of the ages of stage boundaries inherent in GTS 89 because of its misuse of conodont zones, which it employed as chrons to subdivide the Devonian Period.

78 citations