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Duration of the Early Cambrian: U-Pb ages of volcanic ashes from Avalon and Gondwana
Volcanic zircons from three ashes give a U-Pb date of 511 ± 1 Ma on trilobite-bearing, upper Lower Cambrian (upper Branchian Series) strata of southern New Brunswick that correlate into the SiberianExpand
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Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept
Abstract Use of the first appearance datum (FAD) of a fossil to define a global chronostratigraphic unit's base can lead to intractable correlation and stability problems. FADs are diachronous—theyExpand
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Palaeogeographical controls on the Cambrian trilobite immigration and evolutionary patterns reported in the western Gondwana margin
Abstract Southward drifting of the western Gondwanan margin during the Cambrian has been demonstrated by means of both palaeomagnetic methods and lithological indicators of climate (such asExpand
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A unified Lower - Middle Cambrian chronostratigraphy for West Gondwana
Similarities in biotic successions support a unified, composite chronostratigraphy for the Lower-Middle Cambrian of the Iberian and Moroccan margins of West Gondwana. The Cordubian Series (emendedExpand
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Global standard names for the Lowermost Cambrian Series and Stage
The GSSP marking the base of the Cambrian System was ratified by the IUGS in 1992. Ratification of the GSSP point at the base of the Trichophycus pedum Ichnozone in the Fortune Head section, easternExpand
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The base of a revised Middle Cambrian: are suitable concepts for a series boundary in reach?
Defining the base of a series that replaces the traditional Middle Cambrian is among the difficult tasks of Cambrian stratigraphy. Non-traditional concepts (such as carbon isotope signatures),Expand
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The Precambrian–Phanerozoic and Ediacaran–Cambrian boundaries: a historical approach to a dilemma
Abstract The Cambrian was originally defined as a rock interval with a trilobite-dominated fauna that overlay a presumed biologically barren Precambrian epoch. Work to formally define the CambrianExpand
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Middle Cambrian fossils from Tizi n'Tichka, the High Atlas, Morocco; Part 2, Hyolitha
Shelly fossils from the basal Middle Cambrian, near the peak of Tizi n'Tichka in the central High Atlas, Morocco, include the new hyolithids Oboedalites peregrinus new species, Emarites decorissimusExpand
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