| 1. |
- Kustatscher, Evelyn, et al.
(författare)
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Flora of The Late Triassic
- 2017. - 1
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Ingår i: The Late Triassic World: Earth in a Time of Transition. - New York : Springer International Publishing. - 9783319680088 ; , s. 545-622
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Bokkapitel (refereegranskat)abstract
- The Triassic was a crucial period of botanical evolutionary innovations and plant diversification. Key plant groups (Bennettitales, Czekanowskiales, Gnetales and several modern fern and conifer families) originated during this span of time, together with some taxa putatively related to angiosperms. The composition of the various plant assemblages shows a more homogeneous flora globally than during the Permian. Nonetheless two major floristic provinces are distinguishable during the Late Triassic (Gondwana and Laurussia) together with several subprovinces (two within Gondwana, nine within Laurussia), based on palyno- and macro-floras.The latter are differentiated by contrasting taxonomic composition and group abundances related to different climatic and regional environmental conditions. Many plant families and genera are widely distributed in the Late Triassic, at least in the respective hemispheres. Based on the array of preserved damage types on leaves and wood, insect faunas appear to have recovered from the end-Permian mass extinction by the Late Triassic, with a major expansion of herbivory in Gondwana. All modern functional feeding groups (FFG) were present by the Triassic, including external foliage feeding, piercing-and-sucking, galling, leaf mining and seed predation, with some evidence for the development of very specialized feeding traits and egg-laying strategies.
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| 2. |
- Pott, Christian, et al.
(författare)
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New data on Selaginellites coburgensis from the Rhaetian of Wüstenwelsberg (Upper Franconia, Germany).
- 2016
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Ingår i: Neues Jahrbuch für Geologie und Palaontologie - Abhandlungen. - Stuttgart : E. Schweizerbart'sche Verlagsbuchhandlung. - 0077-7749. ; 280, s. 177-181
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Tidskriftsartikel (refereegranskat)abstract
- A branched shoot with several attached microsporangiate strobili of the Rhaetian (late Triassic) herbaceous lycophyte Selaginellites coburgensis is described from Wüstenwelsberg near Coburg, Germany, the locus typicus of the species. The strobili all contain Uvaesporites-type microspores, precisely as the single, detached strobilus fragment found in association with one of the original specimens
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| 3. |
- Qu, Yuangao, et al.
(författare)
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Traces of Ancient Life in Oceanic Basalt Preserved as Iron-Mineralized Ultrastructures: Implications for Detecting Extraterrestrial Biosignatures
- 2023
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Ingår i: Astrobiology. - : Mary Ann Liebert. - 1531-1074 .- 1557-8070. ; 23:7, s. 769-785
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Tidskriftsartikel (refereegranskat)abstract
- Benefiting from their adaptability to extreme environments, subsurface microorganisms have been discovered in sedimentary and igneous rock environments on Earth and have been advocated as candidates in the search for extraterrestrial life. In this article, we study iron-mineralized microstructures in calcite-filled veins within basaltic pillows of the late Ladinian Fernazza group (Middle Triassic, 239 Ma) in Italy. These microstructures represent diverse morphologies, including filaments, globules, nodules, and micro-digitate stromatolites, which are similar to extant iron-oxidizing bacterial communities. In situ analyses including Raman spectroscopy have been used to investigate the morphological, elemental, mineralogical, and bond-vibrational modes of the microstructures. According to the Raman spectral parameters, iron minerals preserve heterogeneous ultrastructures and crystallinities, coinciding with the morphologies and precursor microbial activities. The degree of crystallinity usually represents a microscale gradient decreasing toward previously existing microbial cells, revealing a decline of mineralization due to microbial activities. This study provides an analog of possible rock-dwelling subsurface life on Mars or icy moons and advocates Raman spectroscopy as an efficient tool for in situ analyses. We put forward the concept that ultrastructural characteristics of minerals described by Raman spectral parameters corresponding to microscale morphologies could be employed as carbon-lean biosignatures in future space missions. Key Words: Ultrastructures—Iron minerals—Oceanic basalt—Subsurface biosignatures.
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| 4. |
- Slater, Sam M, et al.
(författare)
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An introduction to Jurassic biodiversity and terrestrial environments
- 2018
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Ingår i: Palaeobiodiversity and Palaeoenvironments. - Berlin : Springer Berlin/Heidelberg. - 1867-1594 .- 1867-1608. ; 98, s. 1-5
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Tidskriftsartikel (refereegranskat)abstract
- This special issue of Palaeobiodiversity and Palaeoenvironments is devoted to studies of Jurassic terrestrial floras. The special issue Jurassic biodiversity and terrestrial environments includes nine contributions that investigate plant fossils and their spores and pollen from a range of localities across the globe that stratigraphically span the Jurassic (Fig. 1). These papers are a collective contribution to the IGCP project 632: Continental crises of the Jurassic: Major extinction events and environmental changes within lacustrine ecosystems.
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| 5. |
- Van Konijnenburg-van Cittert, JHA, et al.
(författare)
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A Selaginellites from the Rhaetian of Wüstenwelsberg (Upper Franconia, Germany)
- 2014
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Ingår i: Neues Jahrbuch für Geologie und Palaontologie - Abhandlungen. - E. Schweizerbart’sche Verlagsbuchhandlung, Stuttgart : Schweizerbart. - 0077-7749. ; 272, s. 115-127
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Tidskriftsartikel (refereegranskat)abstract
- Sterile shoots and a microsporangiate strobilus of a new herbaceous lycophyte, Selaginellites coburgensis nov. spec., are described from the Rhaetian (uppermost Triassic) of Wüstenwelsberg near Coburg, Germany. Shoots branch dichotomously and bear two lateral rows of larger and two median rows of smaller microphylls. Sporophylls are scale-like; sporangia contain Uvaesporites-type spores, which permit a direct comparison of macrofossil evidence with the dispersed spore record. Sellaginellites coburgensis is significant because lycophyte macrofossils are exceedingly rare in the Rhaeto-Liassic of Franconia. The plant probably grew in habitats that were shady and relatively humid, perhaps within dense vegetation and/or in close proximity to bodies of water that locally provided a favourable microclimate.
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