Bajocian


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Bajocian

[bə′jō·shən]
(geology)
A European stage: the middle Middle or lower Middle Jurassic geologic time; above Toarcian, below Bathonian.
References in periodicals archive ?
Dever, "Hydrochemical and isotopic characterisation of the Bathonian and Bajocian coastal aquifer of the Caen area (northern France)," Applied Geochemistry, vol.
A Middle Jurassic (Bajocian) ophthalmosaurid (Reptilia, Ichthyosauria) from the Tuxedni Formation, Alaska and the early diversification of the clade.
This cover tectonically undisturbed rests over an unconformity that is Bajocian in age and forms the base of the Middle Jurassic succession (Dieni et al., 1983).
It was found that locally, the Tecocoyunca Group includes in the lower part the associated Formations Zorrillo/Taberna (Early to Late Bajocian), consisting of ~287 m of carbonaceous siltstone, mudstone and subarkosic very fine-grained sandstone and siltstone; this composite unit bears pelecypods and continental plants, as well as two carbon zones; it is interpreted that they were part of a delta complex.
Based on the results of the study of the clay mineral assemblage in the Middle Jurassic sedimentary succession of the Kachchh Basin, India, the Bajocian to Middle Bathonian time interval is interpreted to represent subtropical climatic conditions with seasonal droughts and a moderate supply of terrigenous clastics to the basin.
The Gangni Township section yields ammonites of Sonninidae, mainly including Sonninia, Dorsetensia, Witchellia, etc., and belonging to the Early to Middle Bajocian (Middle Jurassic) [34].
These tax.a suggest that, the age of Datta Formation is Hettangian-Early Bajocian (Early-Middle jurassic).
can be regarded as diachronic (Gomez, 1979), since it took place earlier in the I-LS (Bifrons-Variabilis zones) than in the remaining areas of the Iberian Range (Pseudoradiosa Zone-Lower Bajocian), noticeably conditioning the distribution of the brachiopod successions (Garcia Joral et al., 1990).
Recent revisions of biochronology argue that the deposition of the radiolarites occured from Bajocian to Albian, with a depositional gap during Upper Dogger (Denyer & Baumgartner, 2006).
The lower age limit is clearly late Liassic, however, the upper limit may extend up to Bajocian (Otsuki et al., 1989).
Overlying this hardground there are nodular and well bedded platy, bioturbated limestones of the Gorg Blau Formation with fauna of the early to middle Aalenian and the Bajocian (Discites to Humphriesianum zones), the Concavum Zone of the late Aalenian was not found (Alvaro et al., 1989).