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The kerogen assemblages in the studied sections from the southern areas of the West Tethys shelf are dominated by the Phytoclast Group and terrestrial palynomorphs, although punctual increases in amorphous organic matter, freshwater (\n            <jats:italic>Botryococcus<\/jats:italic>\n            ) and marine microplankton (dinoflagellate cysts, acritarchs and prasinophyte algae) were observed at specific stratigraphic intervals. The opaque\/non-opaque phytoclasts ratio was used to trace changes in palaeoclimate and other palaeoenvironmental parameters and reflect climate gradients associated with water availability during early Toarcian. During the Pliensbachian\u2013Toarcian and Jenkyns events, changes in kerogen assemblages in the southern areas of the West Tethys shelf correlated with changes in the northern Tethys and Panthalassa shelf. The acceleration of the hydrological cycle associated with the aforementioned events was less intense in the northern Gondwana, southern and western Iberian basins, a reflection of the palaeogeographic position of these basins within the semi-arid climate belt when compared with the northern Iberian region and other northern areas of the West Tethys and Panthalassa shelf, inserted in winter-wet and warm temperate climate belts. Amorphous organic matter enrichment associated with the Pliensbachian\u2013Toarcian and Jenkyns events reflects an increase in primary productivity linked with increased continental weathering, fluvial runoff and riverine organic matter, and nutrient input into marine areas, inducing water column stratification and promoting the preservation of organic matter.\n          <\/jats:p>","DOI":"10.1144\/sp514-2020-271","type":"journal-article","created":{"date-parts":[[2021,5,14]],"date-time":"2021-05-14T13:15:22Z","timestamp":1620998122000},"page":"291-307","update-policy":"https:\/\/doi.org\/10.1144\/crossmark-policy","source":"Crossref","is-referenced-by-count":15,"title":["The Phytoclast Group as a tracer of palaeoenvironmental changes in the early Toarcian"],"prefix":"10.1144","volume":"514","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6619-4288","authenticated-orcid":false,"given":"Bruno","family":"Rodrigues","sequence":"first","affiliation":[{"name":"University of Coimbra, MARE 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