Journal ArticleDOI
Changing perspectives on Cambrian chronostratigraphy and progress toward subdivision of the Cambrian system
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TLDR
In this article, the authors proposed the subdivision of the Cambrian System into four series representing subequal spans of time, the lower two series correspond approximately to the traditional Lower Cambrian, the third series corresponds approximately to a traditional Middle Cambrian and the fourth series corresponds roughly to an Upper Cambrian.Abstract:
Important steps have been made toward global subdivision of the Cambrian System. The consensus of opinion is that the system should be subdivided into four series representing subequal spans of time. The lower two series will correspond approximately to the traditional Lower Cambrian, the third series will correspond approximately to the traditional Middle Cambrian, and the fourth series corresponds approximately to the traditional Upper Cambrian. The fourth series, called the Furongian Series, has been ratified by the International Union of Geological Sciences (IUGS). Selection of horizons representing evolutionary events that can be correlated on a global scale, and which can be used as stage or series boundaries, is much more difficult for the lower two series intervals of the Cambrian than it is for the upper two series intervals of the Cambrian. The most practical concept for subdividing the system into stages involves the establishment of two stages each for the first and second series, and establishment of three stages each for the third and fourth series. The lowermost stage of the Furongian, called the Paibian Stage, has been ratified by the IUGS, and the International Subcommission on Cambrian Stratigraphy (ISCS) is nearing decisions on the levels that will used to mark the bases of the upper two stages of the Furongian. Concerning stage boundaries within the proposed third series of the Cambrian, the ISCS is close to decisions on two levels that will be used to mark boundaries.read more
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Book ChapterDOI
The Cambrian Period
TL;DR: The Cambrian Period was characterized by the appearance of metazoans with mineralized skeletons, explosion in biotic diversity and disparity, infaunalization of the substrate, occurrence of metazoan Konservat Fossil-lagerstatten, establishment of most invertebrate phyla, strong faunal provincialism, dominance of trilobites, generally warm climate but with possible glacial-interglacial cycles in the later part, opening of the Iapetus Ocean, progressive equatorial drift and separation of Laurentia, Baltica, Siberia,
Journal ArticleDOI
Advances in Cambrian stratigraphy and paleontology: Integrating correlation techniques, paleobiology, taphonomy and paleoenvironmental reconstruction
TL;DR: A generalized curve of carbon isotopes (δ13C) through the Cambrian suggests a relationship between major biotic events, sea level history and the development of deposits of exceptional preservation (Lagerstatten).
Journal ArticleDOI
Chronology of early Cambrian biomineralization
Artem Kouchinsky,Stefan Bengtson,Bruce Runnegar,Christian B. Skovsted,Michael Steiner,Michael J. Vendrasco +5 more
TL;DR: In this article, the first appearances of major animal groups with mineralized skeletons on the Siberian Platform and worldwide are revised and summarized with references to an improved carbon isotope stratigraphy and radiometric dating in order to reconstruct the Cambrian radiation with a higher precision and provide a basis for the definition of Cambrian Stages 2 to 4.
Journal ArticleDOI
Fossil calibrations for the arthropod Tree of Life
TL;DR: A series of rigorously vetted calibration fossils for arthropod evolutionary history, taking into account recently published guidelines for best practice in fossil calibration are presented, resulting in 80 fossil calibrations for 102 clades.
Journal ArticleDOI
Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept
TL;DR: In this paper, the first appearance datum (FAD) of a fossil to define a global chronostratigraphic unit's base can lead to intractable correlation and stability problems.
References
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BookDOI
A Geologic Time Scale 2004
TL;DR: Gradstein et al. as discussed by the authors proposed a chronostratigraphy approach for linking time and rock in the context of geologic time scales, including the geomagnetic polarity time scale and stable isotope geochronology.
Journal ArticleDOI
Geologic Time Scale: Isotopic age determinations on rocks of known stratigraphic age define an absolute time scale for earth history.
Journal ArticleDOI
Geologic Time Scale 2004 – why, how, and where next!
Felix M. Gradstein,James G. Ogg +1 more
TL;DR: The Geologic Time Scale (GTS) as mentioned in this paper is a scale that integrates currently available stratigraphic and geochronologic information for all Phanerozoic stages.
Journal ArticleDOI
Precambrian-Cambrian boundary global stratotype ratified and a new perspective of Cambrian time
TL;DR: The early stages of the Phanerozoic fauna were earliest Cambrian or younger as discussed by the authors, and the Placentian-Cambrian boundary global stratotype is the base of the phycodes pedum Zone at Fortune Head, southeastern Newfoundland.
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