The environmental implications of upper Paleozoic plant-fossil assemblages with mixtures of wetland and drought-tolerant taxa in tropical Pangea

Bashforth, Arden R.; DiMichele, William A.; Eble, Cortland F.; Falcon-Lang, Howard J.; Looy, Cindy V.; Lucas, Spencer G.

doi:10.1016/j.geobios.2021.04.002

Cited by 33 publications

(5 citation statements)

References 346 publications

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“…Hygromorphic elements like lycophytes and ferns, on the other hand, were rare and distributed mainly close to the margin of the lakes. A general semiarid climate with several minor spells of local drier and wetter conditions is reconstructed by the various proxies such as geochemis-try and palynology, in agreement with the stepwise aridification trend that started in the Pennsylvanian (e.g., DiMichele et al 2008DiMichele et al , 2009Bashforth et al 2021). The climatic fluctuations are only observed in the marginal facies of Gorl, underscoring how sensitive these marginal lake environments were also to minor climatic shifts.…”

Section: Discussionsupporting

confidence: 61%

“…At low latitudes, a stepwise aridification trend, interrupted by wetter intervals (e.g., DiMichele et al 2008DiMichele et al , 2009, started in the Late Pennsylvanian (e.g., Schneider et al 2006;DiMichele et al 2008DiMichele et al , 2009Montañez et al 2016;Bashforth et al 2021) and continued until the Late Triassic (e.g., Schneider et al 2020). This led to changes in the composition of the tropical Euramerican floras and in biome distributions during the Permian (e.g., DiMichele et al 2008;Bashforth et al 2021), from dominant wetland to dryland biomes (Bashforth et al 2021). As shown recently by Marchetti et al (2022), a dramatic increase in both diversity and relative abundance of drought-tolerant taxa took place in central Pangaea during the Artinskian, at about 287 Ma.…”

Section: Introductionmentioning

confidence: 99%

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Reconstructing Kungurian (Cisuralian, Permian) Terrestrial Environments Within a Megacaldera in the Southern Alps (N-Italy) Using Lithofacies Analysis, Palynology and Stable Carbon Isotopes

Vallé¹,

Nowak²,

Kustatscher³

et al. 2023

RIPS

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During the Permian, climate experienced a change from icehouse to greenhouse conditions. Few multidisciplinary studies have investigated Kungurian (late Cisuralian) tropical terrestrial ecosystem and climate changes. Here, we apply an interdisciplinary approach to two alluvial-lacustrine successions of the Athesian Volcanic Group (Southern Alps, northern Italy) deposited in a Kungurian megacaldera during periods of volcanic quiescence. Sedimentological analysis combined with palynofacies studies allowed the reconstruction of the depositional environments. The study of sporomorph assemblages and stable organic carbon isotopes provided information on plant communities and the climate context. Two different depositional environments were present in the megacaldera: one proximal and one more distal with respect to the source, distinguished by a slightly different composition of the sediments, palynofacies and organic carbon isotopes. The plant community in the area was dominated by xeromorphic-hygromorphic taxa. The δ13Corgvalues are comparable to those of other Cisuralian continental organic matter and plants. The stable carbon isotope values show a small variability, which correlates weakly, but significantly, with the abundance of xeromorphic elements. All observations support deposition during semiarid to arid climate conditions, typical of the mid-late Cisuralian in the area.

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Section: Discussionsupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Reconstructing Kungurian (Cisuralian, Permian) Terrestrial Environments Within a Megacaldera in the Southern Alps (N-Italy) Using Lithofacies Analysis, Palynology and Stable Carbon Isotopes

Vallé¹,

Nowak²,

Kustatscher³

et al. 2023

RIPS

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“…These species may be associated either with communities of tree ferns or mixed communities of tree ferns and pteridosperms. These plant assemblages generally developed in basal areas, on moist mineral soils, or ephemeral swamps, far enough from rivers to avoid being disturbed by sediment discharges [34][35][36].…”

Section: Palaeoecological Commentsmentioning

confidence: 99%

The First Representative of the Roachoid Family Spiloblattinidae (Insecta, Dictyoptera) from the Late Pennsylvanian of the Iberian Peninsula

Nel

Santos

Hernández-Orúe

et al. 2022

Insects

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Sysciophlebia ‘sp. form Villablino’, the first Iberian representative of the Palaeozoic–Early Mesozoic family Spiloblattinidae, is described and illustrated. Its forewing colour pattern is strongly similar to those of the Gzhelian–early-middle Asselian species Sysciophlebia euglyptica, Sysciophlebia ilfeldensis, Sysciophlebia rubida, and ‘Sysciophlebia sp. form KBQ’, supporting the currently proposed Gzhelian age for its type locality. It supports the use of the representatives of the Spiloblattinidae for stratigraphic purposes. The diagnoses and limits of the families Subioblattidae, Phyloblattidae, Compsoblattidae, Spiloblattinidae, and of the spiloblattinid genera are discussed.

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“…Wood characteristics and sclerenchyma distribution identify the stromatolite-encased axes from Manebach as slender woody stems and branches of conifers of the Tylodendron -type, which were characteristic elements of mesophilous to xerophilous vegetation types of drier lakeshores, distal river sites, and elevated hinterland areas (Looy et al 2014; Trümper et al 2021; Bashforth et al 2022). The occurrence of stromatolites on conifer axes is somewhat unexpected because late Paleozoic conifers are generally interpreted as extrabasinal elements with a low likelihood of being preserved (Kerp 1996).…”

Section: Discussionmentioning

confidence: 99%

Freshwater Stromatolites From an Early Permian Wetland (Manebach, Thuringian-Forest Basin, Germany): Structure, Development, and Paleoenvironmental Context

HELLWIG,

TRÜMPER,

RÖßLER

et al. 2023

Palaios

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Fossil stromatolites enclosing structurally preserved land plant remains have rarely been documented and studied in detail. Permineralized woody Tylodendron sp. conifer axes (slender stems, branches) from a lacustrine sedimentary sequence in the lower Permian fossil Lagerstätte of Manebach (Thuringian-Forest Basin, central Germany) are frequently surrounded by stromatolites that consist of successive, usually asymmetrical microbial layers. The stromatolites show various growth forms ranging from laminar to palisadic. They developed in stagnant water from microbial overgrowth dominated by slender, unbranched sessile cyanobacterial filaments aligned vertically into tufts or turf-like stands. Interspersed among the filaments were other filamentous and coccoid microorganisms. Preservation of the Tylodendron axes can be exquisite and sometimes even includes extraxylary tissues containing remains of fungi, suggesting that stromatolite formation began soon after the axes had entered the water and were perhaps even conducive to their preservation. Structurally similar fossil microbialitic structures from elsewhere likewise demonstrate that they were effective in preserving plant morphology. The Manebach stromatolites and the plant remains they contain contribute to a more accurate understanding of the complex biological processes in late Paleozoic lake ecosystems.

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The environmental implications of upper Paleozoic plant-fossil assemblages with mixtures of wetland and drought-tolerant taxa in tropical Pangea

Cited by 33 publications

References 346 publications

Reconstructing Kungurian (Cisuralian, Permian) Terrestrial Environments Within a Megacaldera in the Southern Alps (N-Italy) Using Lithofacies Analysis, Palynology and Stable Carbon Isotopes

Reconstructing Kungurian (Cisuralian, Permian) Terrestrial Environments Within a Megacaldera in the Southern Alps (N-Italy) Using Lithofacies Analysis, Palynology and Stable Carbon Isotopes

The First Representative of the Roachoid Family Spiloblattinidae (Insecta, Dictyoptera) from the Late Pennsylvanian of the Iberian Peninsula

Freshwater Stromatolites From an Early Permian Wetland (Manebach, Thuringian-Forest Basin, Germany): Structure, Development, and Paleoenvironmental Context

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