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- W2014993419 abstract "Jurassic radiolarians from 220 samples in Queen Charlotte Islands, B.C., Williston Lake, B.C., east-central Oregon, Baja California Sur, southern Spain, Austria, Slovenia, Turkey, Oman, Japan and Argentina were studied in order to construct global zonation for the Pliensbachian, Toarcian and Aalenian stages. Well-preserved faunas from continuous stratigraphic sections in Queen Charlotte Islands provide the most detailed record for this time interval, and all collections are tied to North American ammonite zones or assemblages. Collections from nearly all other areas lack independent dating except for early Toarcian carbon-isotope dating in Slovenia and late Aalenian ammonites in Spain. A database of 197 widely distributed updated taxonomic species was used to construct a Unitary Association (UA) zonation for the interval. A global sequence of 41 UAs was obtained for the top of the Sinemurian to the base of the Bajocian. The first and the last UAs represent the Late Sinemurian and the Early Bajocian respectively. The remaining 39 UAs were merged into nine zones (four Early Pliensbachian, one Late Pliensbachian, one Early Toarcian, one Middle–Late Toarcian, and two Aalenian) according to prominent radiolarian faunal breaks and ammonite data. The new zones are the Canutus tipperi – Katroma clara Zone (latest Sinemurian/earliest Pliensbachian); Zartus mostleri – Pseudoristola megaglobosa, Hsuum mulleri – Trillus elkhornensis and Gigi fustis – Lantus sixi zones (Early Pliensbachian); Eucyrtidiellum nagaiae – Praeparvicingula tlellensis Zone (Late Pliensbachian); Napora relica – Eucyrtidiellum disparile Zone (Early Toarcian); Elodium pessagnoi – Hexasaturnalis hexagonus Zone (Middle and Late Toarcian); Higumastra transversa – Napora nipponica Zone (early Aalenian); and Mirifusus proavus – Transhsuum hisuikyoense Zone (late Aalenian). These zones can be correlated worldwide and link previously established UA zonations for the Hettangian–Sinemurian and the Middle to Upper Jurassic. The new zonation allows high-resolution dating in the studied interval and provides a solid basis for analyzing faunal turnovers and the paleobiogeography of Jurassic radiolarians." @default.
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- W2014993419 date "2010-11-01" @default.
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- W2014993419 title "Global radiolarian zonation for the Pliensbachian, Toarcian and Aalenian" @default.
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- W2014993419 doi "https://doi.org/10.1016/j.palaeo.2010.08.024" @default.
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