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Kustatscher E.,Museo di Science Naturali dellAlto Adige | Kustatscher E.,Ludwig Maximilians University of Munich
Review of Palaeobotany and Palynology | Year: 2014

The Middle Jurassic flora of Sardinia has been studied, and 24 taxa (19 genera) belonging to horsetails, ferns (Phlebopteris, Hausmannia, Coniopteris, Todites, Cladophlebis), seed ferns (Sagenopteris, Ptilozamites), cycadophytes (Nilssonia, Pterophyllum, Cycadeospermum, Ptilophyllum, Williamsonia, Weltrichia, Taeniopteris), ginkgophytes (Czekanowskia), conifers (Geinitzia, Brachyphyllum, Elatocladus) and seeds (Carpolithes), have been identified. The flora of Sardinia is the southernmost of all Middle Jurassic European floras. The coeval European and North African floral assemblages (112 genera) are present in a wide variety of environments and different palaeogeographic positions, which is reflected in a wide variety of taxa. A comparison between the coeval floras of Middle Jurassic age reveals a higher degree of dissimilarity than similarity between the various assemblages, which is in disagreement with the general picture of the homogeneity in the Jurassic floras given by previous authors. © 2014 Elsevier B.V.

Dal Corso J.,University of Padua | Roghi G.,CNR Institute of Geosciences and Earth Resources | Kustatscher E.,Museo di Science Naturali dellAlto Adige | Kustatscher E.,Ludwig Maximilians University of Munich | And 3 more authors.
Review of Palaeobotany and Palynology | Year: 2015

An integrated sporomorph and ammonoid biostratigraphy has been carried out in three upper Anisian (Middle Triassic) stratigraphic sections in the Southern Alps (Italy). Two main sporomorph assemblages have been defined and calibrated with ammonoids. The TrSM-A assemblage is marked by the co-occurrence of Stellapollenites thiergartii, Dyupetalum vicentinense, Cristianisporites triangulatus and Staropollenites antonescui. The TrSM-B assemblage is marked by the first occurrence of Cannanoropollis scheuringii. The boundary between the TrSM-A and TrSM-B assemblages falls in the upper part of the reitzi ammonoid subzone (Hungarites zone; Illyrian). The TrSM-A and TrSM-B assemblages have been compared and correlated with other existing sporomorph biozonations for the northwestern Tethys, the Germanic Basin and the Barents Sea.The first occurrence of the genus Ovalipollis is recorded within the assemblage TrSM-A, in the lower-middle reitzi ammonoid subzone.Quantitative palynological data coupled with previously published studies show a shift from hygrophytic to xerophytic elements in the trinodosus-lower reitzi ammonoid subzones. This change in precipitation range can be recognised in other sections in the northwestern Tethys but seems to have preceded a similar shift recorded in the Boreal realm. © 2014 Elsevier B.V.

Scanu G.G.,University of Cagliari | Kustatscher E.,Museo di Science Naturali dellAlto Adige | Pittau P.,University of Cagliari
Bollettino della Societa Paleontologica Italiana | Year: 2012

A preliminary account is presented herein of the revision of 473 slabs containing macrofossil plant remains from the Domenico Lovisato plant Collection. The latter is housed in the Museo Sardo di Geologia e Paleontologia "D. Lovisato" of the Università di Cagliari. The material examined encompasses palaeobotanical remains collected from the Genna Selole Formation and from the basal part of the Dorgali Formation, both of Jurassic age at a variety of localities in Barbagia and Sarcidano, eastern Sardinia. A reconstruction is given of the history of the collection, initiated in 1888, and the scientific studies of the flora by a variety of palaeobotanists. Based on a preliminary revision of the specimens the following genera are recognized: Phlebopteris Brongniart, 1836, Hausmannia Dunker, 1846, Coniopteris Brongniart, 1849, Cladophlebis Brongniart, 1849, Sagenopteris Presl in Sternberg, 1838, Cycadeospermum Saporta, 1875, Ptilophyllum Morris in Grant, 1840, Williamsonia Carruthers, 1870 emend. Harris, 1969, Weltrichia Braun, 1847 emend. Harris, 1969, Taeniopteris Brongniart, 1828, Czekanowskia Heer, 1876 emend. Harris et al., 1974, Brachyphyllum Brongniart, 1828, Elatocladus Halle, 1913 emend. Harris, 1979 and Carpolithes Brongniart, 1822. Some plant remains have been putatively assigned to the following genera: Ptilozamites Nathorst, 1878 emend. Antevs, 1914, Nilssonia Brongniart, 1825, Pterophyllum Brongniart, 1828 and Geinitzia Endlicher, 1847. Several of these genera are known also from the Jurassic flora of Yorkshire and from other Jurassic floras of Italy.

Ronchi A.,University of Pavia | Kustatscher E.,Museo di Science Naturali dellAlto Adige | Pittau P.,University of Cagliari | Santi G.,University of Pavia
Geologia Croatica | Year: 2012

The paper provides an overview of the main Pennsylvanian sites in Italy yielding associations rich in plants and/or palynomorphs. So far in Italy, the principal outcrops are located in the Southern Alps, Tuscany and Sardinia. In the Western Southern Alps and bordering Switzerland, Westphalian outcrops are small and scattered. Nevertheless, one of them yielded an abundant fossil flora, stored at the Museo Civico di Storia Naturale of Milan, (Venzo and Maglia Collection). In the Carnic Alps, (Eastern Southern Alps), continental deposits of Moscovian to Gzhelian age also occur near the border with Austria. They have produced a high number of preserved plant fossils, presently stored in the Museo Friulano di Storia Naturale of Udine. In Tuscany, the two main sections yielding Westphalian to Autunian floras are those of the Iano and Pisani Mountains. A rich collection of plant fossils from those sites is hosted at the Museo di Storia Naturale of Florence University and at the Museum of Natural History of Pisa University. In Sardinia, plant fossil sites are located in the south west and central east parts of the island. The San Giorgio Basin (Iglesiente subregion) and the Tuppa Niedda section (Arburese subregion) are late Westphalian - early Stephanian in age. In the Barbagia at SeuiSeulo and the Gerrei subregions, other continental basins yielded transitional 'StephanianAutunian' fossil plant associations. The slabs are stored as part of the Lovisato Collection at the Lovisato Museum of the Chemical and Geoscience Department of Cagliari University. Smaller historical outcrops of Carboniferous age are also known from other Italian regions, such as Liguria.

Dal Corso J.,University of Padua | Preto N.,University of Padua | Kustatscher E.,Museo di Science Naturali dellAlto Adige | Mietto P.,University of Padua | And 2 more authors.
Palaeogeography, Palaeoclimatology, Palaeoecology | Year: 2011

The carbon-isotope signatures of Carnian (Late Triassic) amber drops from Rifugio Dibona (Southern Alps, Italy) were studied and compared with that of other Middle-early Late Triassic fossil plant remains, namely wood and leaves. Amber, wood and leaf carbon-isotope data are highly variable within the same beds. δ13Camber values vary by up to 5.4‰ and are enriched by ~2.5‰ with respect to associated wood. δ13Cwood and δ13Cleaf ranges are narrower than that of amber (~2-3‰) and the isotopic offset within each bed is similar over time. The high Triassic amber carbon-isotope variability is similar to that of recent resin. Despite the high variability, δ13Cwood and δ13Cleaf illustrate a Middle-early Late Triassic secular positive trend that is similar to that of marine δ13Cinorg data and must record the carbon-isotope evolution of the ocean-atmosphere system. © 2011 Elsevier B.V.

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