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- W1837337597 abstract "A palynostratigraphic investigation of partly ammonite dated, Pliensbachian to Bathonian (Early – Middle Jurassic)strata on the Isles of Skye and Raasay, Inner Hebrides in Northwest Scotland, has recovered a diverse but not alwayswell preserved miospore flora and a less diverse dinoflagellate cysts flora. The studied interval has been subdividedinto five biozones, A - E, based on the first occurrence, common occurrence, first common occurrence, andrelative abundance of pollen and spore key taxa. Biozone A (Pliensbachian) is defined by the co-occurrence of severallong ranging taxa, e.g. Corollina spp. and Cerebropollenites spp., as well as the presence of rare Spheripollenitessubgranulatus. Biozone B (late Toarcian-early Aalenian) is defined by abundant presence of Spheripollenitessubgranulatus. Biozones A and B are separated by a large hiatus. The lower boundary of Biozone C (lateAalenian - early Bajocian) is marked by the first co-occurrence of Callialasporites dampieri, C. turbatus and C.minus. The lower boundary of Biozone D (middle Bajocian - early Bathonian) is defined by the first occurrence ofNeoraistrickia gristhorpensis, while the uppermost zone, Biozone E (middle/late Bathonian), is marked by a significantincrease in the abundance of Perinopollenites elatoides and Araucariacites australis. The erected biozonescorrelate well with other biostratigraphic zonations and palynological results from Northwest Europe. Existingspore-pollen zonations from NW Europe often lack independent stratigraphic dating. Hence, the results from thisstudy provide, for the first time, biostratigraphical constraints on some important spore-pollen events during theEarly - Middle Jurassic.The depositional environments are interpreted as marine during the Pliensbachian – Toarcian (Early Jurassic), marinenear shore in Aalenian – Bajocian (Middle Jurassic) and brackish/lagoonal to terrestrial in Bathonian (MiddleJurassic). This is consistent with previous interpretations of the depositional environment in the Inner Hebrides Basinduring this time interval.An environmental interpretation based on ecological and climatological preferences of the probable parent plantshas also been performed for the Toarcian – Bathonian interval. The results indicate a warm and humid climate inLate Toarcian, followed by a cooling period in Early Aalenian. In the late Aalenian/Early Bajocian the conditionsbecome warm and dry, after which the climate becomes gradually cooler and more humid during the mid Bajocian– middle/late Bathonian. This interpretation correlates well with other climatic interpretations over the interval." @default.
- W1837337597 created "2016-06-24" @default.
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- W1837337597 date "2008-01-01" @default.
- W1837337597 modified "2023-09-26" @default.
- W1837337597 title "Palynostratigraphy and palaeoclimatic analysis of Lower-Middle Jurassic (Pliensbachian - Bathonian) of the Inner Hebrides, NW Scotland" @default.
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