The palynology of the Cañadón Asfalto Formation (Jurassic), Cerro Cóndor depocentre, Cañadón Asfalto Basin, Patagonia, Argentina: palaeoecology and palaeoclimate based on ecogroup analysis

Abstract

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Extinction of herbivorous dinosaurs linked to Early Jurassic global warming event

“…B 287: 20202310 dipteridacean ferns with fronds of 2 m in diameter, conifers, seed ferns, Bennetitales and cycads (figure 1) indicative of humid conditions. By contrast, the less diverse fossil pollen and flora postdating the volcanic event are indicative of seasonally dry and warm conditions, and are largely dominated by the conifers Araucariaceae, Cheirolepidiaceae and Cupressaceae [17,18,29], all of which have small scaly leaves (figure 1). Similar changes in plant assemblages have been recently noted from the Northern Hemisphere coeval with the T-OAE [30,31], including a decrease in taxonomic diversity, increase in abundance of thermophilic groups and progressive dominance of the above-mentioned conifer clades.…”

Coniferous woods from the Upper Triassic of southwestern Gondwana, Tronquimalal Group, Neuquén Basin, Mendoza Province, Argentina

“…In the Triassic basins of Argentina, the genus Classopollis has been recorded previously (sporadically) in late Late Triassic units (=Norian to Rhaetian). These Cheirolepidiacean pollen grains are frequent to dominant in Jurassic strata of Argentina and Gondwana (Grant-Mackie et al, 2000; Cúneo et al, 2013; de Jersey and McKellar, 2013; Olivera et al, 2015, and references therein).…”

Palaeogeographical evolution of the Rattray Volcanic Province, Central North Sea

“…The palynological data was subjected to principle component analysis, correspondence analysis and detrended correspondence analysis (for an overview of these methods see Hammer & Harper 2007), however, because of the nature of the data set, no statistically significant results were obtained. An alternative approach using broad palynomorph ecogroups after Abbink et al (2004) and Olivera et al (2015) was used, in conjunction with the definition of petrophysical and seismic facies, to indicate broad palaeoenvironmental conditions during the development of the Rattray Volcanic Province. The absence of quantitative data meant that the grouping of different species into different palynomorph ecogroups is subjective and should be considered as a preliminary environmental model for the area.…”

“…clubmosses) spores, xerophytic gymnosperms, and gymnosperm families. Fern, bryophytes and lycopsid spores are indicative of plants which likely grew in relatively wet lowland environments (Abbink et al 2004;Olivera et al 2015), e.g. fluvial floodplains or lake-side vegetation.…”