Jurassic phytogeography and climates: new data and model comparisons

Rees, P. J.; Zeigler, AM; Valdes, PJ

doi:10.1017/cbo9780511564512.011

Cited by 167 publications

(224 citation statements)

References 32 publications

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“…Vardabasso, 1959;Cherchi and Schroeder, 1985a), the paleogeographic separation from W and E Sardinia only existed during the early part of the Middle Jurassic: in fact, evidences of Middle Triassic to Early Jurassic removed sedimentary cover have been found as pebbles in the conglomerates of eastern Sardinia and Corsica.. Casellato et al (2012) and Jadoul et al (2010) hypothesize about the gradual growth of several isolated shallow carbonate bodies that merged later in E Sardinia during the late Midpalynologic and plant assemblages (Del Río, 1984;Rees et al, 2000) and the pedogenetic evidence (laterites and calcretes). The horst flanks supplied debris for the rapid infilling of the grabens, preventing pedogenesis there.…”

Section: Discussion: the Eastern Sardinia-corsica Highmentioning

confidence: 99%

“…As a consequence, the areas that have been longer exposed during Middle Jurassic emersion can be identified. In fact, these areas are marked by the same type of lateritic alteration, which is variable in grade, but not in kind, and is driven by a warm-humid climate (Rees et al, 2000). This is typical of Sardinia during this period (Scanu et al, 2014), and is thus unmistakable with respect to other emersion periods of different ages and showing diverse features: e.g., the Permian emersion periods are never marked by pedogenetic processes.…”

Section: Middle Jurassic Alpine Tethyan Unconformitymentioning

confidence: 94%

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The Middle Jurassic Alpine Tethyan Unconformity and the Eastern Sardinia - Corsica Jurassic High: A sedimentary and regional analysis

Costamagna

2016

Journal of Iberian Geology

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Investigations performed along the Middle Jurassic Alpine Tethyan unconformity surface of E Sardinia evidenced an elaborate surface that developed over older Late Paleozoic to Triassic rocks. This surface is covered by the Middle Jurassic Genna Selole Fm, which has different sedimentological and petrographical characteristics and thicknesses according to its location and the morphology and evolution of the lower substrate.An analysis of the unconformity and the rocks located above and below it revealed that a tectonic high emerged early during the Middle Jurassic from E Sardinia to Corsica in response to the extensional tectonics leading to the Alpine Tethys opening. This high was almost immediately fragmented in secondary blocks, and an irregular morphology of minor lows and highs thus formed upon it. The high was, on the whole, subjected to strong erosion. Its deposits accumulated along the rims of the high and in the lows of its surface, smoothing the landscape and preparing it for the marine transgression that followed. The tectonic high rapidly collapsed starting from its North side as show the older age of the marine deposits first investigated.A similar rise-and-collapse tectosedimentary evolution can be seen in some of the W Mediterranean domains next to the Sardinia-Corsica block. Indeed, they are all related to the Alpine Tethys opening and may mark a discontinuous high separating the Paleoeuropa from the Tethyan domain. Consequently, a comparison with all of these domains has been attempted by trying to set the Sardinia-Corsica block in this extensional margin scenario.Keywords: Alpine Tethys, Unconformity, Jurassic, Paleogeography, Sedimentology, Eastern Sardinia-Corsica Tectonic high ResumenInvestigaciones llevadas a cabo en la superficie discordante del Jurásico Medio del Tetis alpino evidencia que esta superficie está muy elaborada y se desarrolló sobre rocas que abarcan desde un registro Paleozoico Superior a Triásico. Esta superficie está cubierta por la Fm Genna Selole, de edad Jurásico Medio, que tiene diferentes características sedimentológicas y petrológicas y una potencia que depende de su localización y la morfología y evolución del substrato inferior.Un análisis de esta discordancia y de las rocas localizadas por encima y debajo de la misma revela que hubo un importante alto tectónico in etapas iniciales del Jurásico Medio que afectaba desde el E de Cerdeña a Córcega en respuesta a una tectónica extensional relacionada con la apertura del Tetis alpino. Esta área elevada fue rápidamente fragmentada en bloques desarrollándose una morfología de zonas altas y deprimidas previa a la transgresión marina que llegó seguidamente. Por los datos que muestran los primeros registros marinos se puede deducir que la fragmentación del citado alto tectónico se inició por su parte norte. Una evolución similar en zonas altas y bajas puede observarse igualmente en otras zonas del Mediterráneo occidental próximas al bloque de Córcega-Cerdeña. De hecho, todas ellas están relacionadas con la apertura de...

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Section: Discussion: the Eastern Sardinia-corsica Highmentioning

confidence: 99%

Section: Middle Jurassic Alpine Tethyan Unconformitymentioning

confidence: 94%

The Middle Jurassic Alpine Tethyan Unconformity and the Eastern Sardinia - Corsica Jurassic High: A sedimentary and regional analysis

Costamagna

2016

Journal of Iberian Geology

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“…One hypothesis (Feild et al 2004(Feild et al , 2009) is based on the fact that the living ANITA lines (except for Nymphaeales, which are derived in being aquatic) are ecologically restricted to wet forest understorey habitats, as in New Caledonia and Queensland today, and low in diversity (only 0.1% of angiosperm species). This suggests that pre-Cretaceous ANITA-grade angiosperms could have escaped detection because wet habitats suitable for them were geographically restricted, because arid and semiarid conditions prevailed across most of the tropics (Rees et al 2000;Ziegler et al 2003). The rise of angiosperms observed in the Cretaceous might reflect the origin and radiation of mesangiosperms, assuming that these were able to escape from the original wet understorey niche (as argued by Feild et al 2004) and had higher rates of diversification (as inferred by Magallón and Sanderson 2001).…”

Section: Concluded Thatmentioning

confidence: 97%

Recognising angiosperm clades in the Early Cretaceous fossil record

Doyle

2014

Historical Biology

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Studies of the earliest Cretaceous angiosperms in the 1970s made only broad comparisons with living taxa, but discoveries of fossil flowers and increasingly robust molecular phylogenies of living angiosperms allow more secure recognition of extant clades. The middle to late Albian rise of tricolpate pollen and the first local dominance of angiosperm leaves mark the influx of near-basal lines of eudicots. Associated flowers indicate that palmately lobed 'platanoids' and Sapindopsis are both stem relatives of Platanus, while Nelumbites was related to Nelumbo (also Proteales) and Spanomera to Buxaceae. Monocots are attested by Aptian Liliacidites pollen and Acaciaephyllum leaves and Albian araceous inflorescences. Several Albian-Cenomanian fossils belong to Magnoliidae in the revised monophyletic sense, including Archaeanthus in Magnoliales and Virginianthus and Mauldinia in Laurales, while late Barremian pollen tetrads (Walkeripollis) are related to Winteraceae. In the basal ANITA grade, Nymphaeales are represented by Aptian and Albian flowers and whole plants (Monetianthus, Carpestella and Pluricarpellatia). Epidermal similarities of lower Potomac leaves to woody members of the ANITA grade are consistent with Albian flowers assignable to Austrobaileyales (Anacostia). Aptian to Cenomanian mesofossils represent both crown group Chloranthaceae (Asteropollis plant) and stem relatives of Chloranthaceae and/or Ceratophyllum (Canrightia, Zlatkocarpus, Pennipollis plant and possibly Appomattoxia).

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“…Bornholm was situated at a latitude of 358N during deposition of the Bagå Formation sediments (Scotese 2003), which places Bornholm firmly within the Jurassic warm temperature biome (Rees et al 2000). However, the presence of ginkgoaleans and the absence of very large-leafed bennettites suggest the climate was somewhat seasonal and not so warm as to be considered tropical or megathermal.…”

Section: Palaeo-environment and Climate Interpretationmentioning

confidence: 99%

A Jurassic (Pliensbachian) flora from Bornholm, Denmark – a study of a historic plant-fossil collection at Lund University, Sweden

Mehlqvist

Vajda

Larsson

2009

GFF

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A historic collection of plant fossils from the Bagå Formation, Bornholm, Denmark registered at the Lund University is reviewed and found to be dominated by ferns with subsidiary Ginkgoales, Coniferales, Bennettitales and Equisitales. Ten genera are represented, of which six can be confidently identified to species level. The Bagå Formation flora is most similar in age to the flora of the Middle Jurassic Mariedals Formation of Eriksdal, Skåne, although there are important compositional differences between these assemblages. The Bagå flora is characteristic of the temperate (warm and humid) biome of the Early-mid Jurassic. A historical investigation reveals that at least four scientists contributed material to the collections. A palynological investigation made on samples from the leaf fossils reveals that the macroflora was most probably collected from the Sorthat beds as the palynoflora corresponds to the Pliensbachian Chasmatosporites Zone.

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Jurassic phytogeography and climates: new data and model comparisons

Cited by 167 publications

References 32 publications

The Middle Jurassic Alpine Tethyan Unconformity and the Eastern Sardinia - Corsica Jurassic High: A sedimentary and regional analysis

The Middle Jurassic Alpine Tethyan Unconformity and the Eastern Sardinia - Corsica Jurassic High: A sedimentary and regional analysis

Recognising angiosperm clades in the Early Cretaceous fossil record

A Jurassic (Pliensbachian) flora from Bornholm, Denmark – a study of a historic plant-fossil collection at Lund University, Sweden

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