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Shuzhong Shen - One of the best experts on this subject based on the ideXlab platform.
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first record of cisuralian guadalupian plant fossils from the shan plateau eastern myanmar
Palaeoworld, 2020Co-Authors: Weiming Zhou, Shuzhong Shen, Yichun Zhang, Kyi Pyar Aung, Li Liu, Than Zaw, Jun WangAbstract:Abstract Permian plant fossils have never been reported from the Shan Plateau in eastern Myanmar. Recently, a black to gray carbonaceous mudstone unit containing abundant plant fossils was discovered just below the lowest part of Thitspin Limestone Formation from the Linwe Area, eastern Myanmar. Although only five taxa were identified, the plant assemblage provides the first evidence of the occurrence of Cathaysian elements in eastern Myanmar and potentially indicates the presence of a highly diverse Permian flora. Among the five species, Cordaites principalis and Annularia mucronata were cosmopolitan species; while Callipteridum cf. koraiense, Taeniopteris crassinervis Mo and Rhipidopsis lobata were mostly recorded in the Cathaysia Flora. Therefore, the present assemblage generally indicates a palaeobiogeographical affinity to the Cathaysian Province. Stratigraphically, Callipteridum cf. koraiense was mainly reported from Cisuralian to Wordian; whereas Taeniopteris crasssnervis Mo and Rhipidopsis lobata were recorded from Capitanian to Changhsingian, which suggests a general Permian age based on the plant assemblage itself only. However, the carbonaceous mudstone at the outcrop is overlain by the Thitspin Limestone Formation containing middle Guadalupian fusulinids. Based on previous faunal analyses, the Sibumasu terrane contains typical Gondwanan cold-water faunas during the early Cisuralian, warm-water faunas occurred after Sakmarian. Thus, age of the fossil-plant-containing carbonaceous mudstone is very likely between late Cisuralian and early Guadalupian as constrained by its overlying fusulinids and its warm Cathaysian palaeobiogeographical affinity.
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early permian cisuralian global brachiopod palaeobiogeography
Gondwana Research, 2013Co-Authors: Shuzhong Shen, G.r. Shi, Hua Zhang, Junfang Xie, Junxuan FanAbstract:Abstract Palaeobiogeography of four consecutive Early Permian (Cisuralian) stages is quantitatively analyzed based on a global database of brachiopods consisting of 9131 occurrences, 3003 species of 515 genera of brachiopods from 2757 localities all over the world. Our analyses reveal three distinct largely palaeolatitude-related palaeobiogeographical realms developed during the Cisuralian like the other stages of the Permian. Six distinct provinces are distinguished during the Asselian. The Asselian brachiopod faunas from Gondwanaland and its surrounding areas in general are not well differentiated at the provincial level and characterized an Indoralian province. A large transitional zone (Southern Transitional Zone, STZ) between the Palaeoequatorial and Gondwanan Realms and another distinct Austrazean province in the eastern margin of Gondwanaland were formed from Sakmarian, contemporaneous with the largest peak of the Late Palaeozoic Ice Age. In contrast to the STZ, the palaeogeographical stations in the northern temperate transitional zone are not differentiated before Kungurian; instead they are grouped with the stations in the palaeoequatorial region, thus collectively constituting a large asymmetrical Cathaysian province stretching from South China, Iran in the western Palaeotethys to the Mongolian continent in the north. The Northeast European province mainly consisting of the stations in the Ural Fold Belt and eastern and northeastern parts of the European Platform shows a closer palaeobiogeographical relationship with the Cathaysian province when the Ural seaway opened to the Palaeotethys in the southern end before the Kungurian, but became more distinguished during the Kungurian after the closure of the Ural seaway and showed a relationship with the faunas of the Boreal Realm and the Northern Transitional Zone (NTZ). The stations in Texas, western North America constitute a distinct Grandian province based on the high-diversity brachiopod faunas with abundant endemic taxa, and became distinguishable even at the realm level during the Kungurian. Three high-latitude provinces, the Verkolyman province with characteristic Boreal brachiopod faunas, the Paratinan province with some bipolar and cosmopolitan genera in South America, and the Austrazean province in eastern Australia and New Zealand, were present from the Sakmarian. Further Principal Co-Ordinate analysis (PCO) and Minimum Spanning Tree (MST) analysis suggest that palaeolatitude-related thermal gradient was the major controlling determinant for the Cisuralian provincialism and brachiopod distribution. In addition, geographic barriers and regional eustatic changes also played some roles in the brachiopod distribution and Cisuralian marine palaeobiogeography. The transition from an icehouse to greenhouse stage led to a steady increase in brachiopod diversity and provincialism during the Cisuralian and Guadalupian.
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cancrinella and costatumulus brachiopoda from the permian of south mongolia and south china their morphology biostratigraphy and distribution
Geobios, 2012Co-Authors: G.r. Shi, Ariunchimeg Yarinpil, Shuzhong ShenAbstract:Two brachiopod genera, Cancrinella Fredericks and Costatumulus Waterhouse, are studied from the Permian of South Mongolia and South China. Many of the specimens previously described as Cancrinella are revised and assigned to Costatumulus. The new data presented in this paper indicate that these two genera are similar to each other, but are distinguishable by different features in relation to their morphology. Several species of both genera are described here, providing critical new information on the morphology and taxonomy of Cancrinella and Costatumulus. The reported biostratigraphical information reveals that species of Cancrinella are present from the Lower Carboniferous (Tournaisian) to Middle Permian (Capitanian), whereas species of Costatumulus are mostly restricted to the Lower Permian (Sakmarian) to Upper Permian (Changhsingian). An analysis of the palaeogeographical distribution of Cancrinella and Costatumulus reveals that Cancrinella was more commonly distributed in the Northern Transitional Zone and the Boreal Realm, in contrast to Costatumulus, which tended to be more common in the Southern Transitional Zone and Gondwanan Realm.
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carbon isotope chemostratigraphy and implications of palaeoclimatic changes during the cisuralian early permian in the southern urals russia
Gondwana Research, 2012Co-Authors: Jun Zeng, Vladimir I Davydov, Shuzhong ShenAbstract:Abstract In order to meet the requirements for potential GSSPs in the Cisuralian Series (Early Permian), isotopic chemostratigraphy from the Carboniferous/Permian boundary to middle Artinskian using bulk carbonates was investigated under high-resolution biostratigraphical and new geochronologic constrains from three GSSP candidate sections at Usolka, Kondurovsky and Dal'ny Tulkas in the southern Urals, Russia. A gradually increasing trend in carbonate carbon isotope (δ 13 C) has been observed in the interval from the base of Asselian to early Sakmarian, which is generally consistent in timing with the increasing development of Glacial III or P1 from the latest Carboniferous to early Sakmarian (Early Permian) which prevailed in southern Gondwana. An excursion with double negative shifts in δ 13 C value is present around the Asselian/Sakmarian boundary in both the Usolka and Kondurovsky sections, which may have great potential to serve as chemostratigraphical marks for intercontinental correlation. The following highly positive excursion of δ 13 C in early Sakmarian indicates the maximium expansion of Glacial III or P1. The negative δ 13 C shift in the middle Sakmarian is possibly related to the quick collapse of Glacial III or P1 on the Gondwanaland. This negative shift is largely correlative with those documented in other areas of Russia, the North American Craton and South China, but further precise biostratigraphical and geochronologic constrains are neccessary to confirm this global signal. The late Sakmarian is characterized by a strong oscillation stage of δ 13 C, which probably indicates a complex climate transition marked by smaller alternating glacial–interglacial transitions during Glacial P2 superimposed on an overall warming trend. The sharp negative δ 13 C shift around the Sakmarian/Artinskian boundary at the Dal'ny Tulkus section is difficult to interpret. This is followed by long-term low values ( 13 C values in the Artinskian at the Dal'ny Tulkas section might result regionally from the enhanced input of organic carbon after the melt-out of ice sheets and the subsequent degradation and isotopic refractionation of the microbial chemosynthetic processes on the buried organic matter.
Shintani Tomohiko - One of the best experts on this subject based on the ideXlab platform.
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Early Permian (Sakmarian) brachiopods from the Nagaiwa‒Sakamotozawa area, South Kitakami Belt, northeastern Japan, Part 3: Productidina
新潟大学理学部, 2015Co-Authors: Tazawa Jun-ichi, Shintani TomohikoAbstract:In this third manuscript in a series, the following 10 species of productid brachiopods (suborder Productidina), including one new species, are described from the lowest part of the Sakamotozawa Formation (Sakmarian) in the Nagaiwa‒Sakamotozawa area, South Kitakami Belt, northeastern Japan: Echinauris opuntia (Waagen), Reticulatia cf. donetziana (Licharew), Echinaria sp., Juresania sp., Waagenoconcha humboldti (d’Orbigny), Edriosteges cf. multispinosus Muir-Wood and Cooper, Linoproductus simensis (Tschernyschew), Auriculispina kanmerai Tazawa and Shintani, sp. nov., Terrakea sp. and Cyclacantharia sp. The Nagaiwa‒Sakamotozawa fauna is a mixed Boreal‒Tethyan fauna, with a predominance of Boreal elements
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Early Permian (Sakmarian) brachiopods from Kamiyasse, South Kitakami Belt, northeast Japan
新潟大学理学部, 2014Co-Authors: Tazawa Jun-ichi, Shintani TomohikoAbstract:An early Permian (Sakmarian) brachiopod fauna, consisting of 20 species in 14 genera, is described from the basal part of the Nakadaira Formation in the Kamiyasse area, South Kitakami Belt, northeast Japan. The new species described here are Derbyia yukisawensis Tazawa and Shintani, Nipponirhynchia kamiyassensis Tazawa and Shintani, Spiriferellina nanbuensis Tazawa and Shintani and Crenispirifer nakamurai Tazawa and Shintani. The Kamiyasse fauna is a mixed Boreal–Tethyan fauna, and has some affinities with the early Permian brachiopod faunas of northern Russia (Kolyma, Pechora and the northern Urals), northwest China (Xinjiang) and north China (Inner Mongolia). Palaeobiogeographical data for the Kamiyasse fauna suggest that during the Sakmarian the South Kitakami region was probably located at mid-latitudes in the Northern Hemisphere, immediately east of North China (Sino-Korea)
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Orthotetoids from the Lower Permian (Sakmarian) of the Nagaiwa-Sakamotozawa area, South Kitakami Belt, northeast Japan
新潟大学理学部, 2011Co-Authors: Shintani TomohikoAbstract:A lot of brachiopods occur in the basal part of the Sakamotozawa Formation (Sakmarian) in the Nagaiwa-Sakamotozawa area, South Kitakami Belt, northeast Japan. Orthotetoid brachiopods are the most abundant taxa within the Nagaiwa-Sakaotozawa fauna. In this paper, the following five species of the orthotetoid brachiopods are described: Meekella striatocostata (Cox), Meekella nagaiwensis sp. nov., Derbyia crassa (Meek and Hayden), Derbyia dorsosulcata Liu and Waterhouse, and Derbyia sakamotozawensis sp. nov
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A fusuline fauna from the basal part of the Sakamotozawa Formation in the Kamiyasse area, South Kitakami Belt, Northeast Japan
新潟大学理学部, 2011Co-Authors: Ueno Katsumi, Shintani Tomohiko, Tazawa Jun-ichiAbstract:This paper describes schwagerinid fusulines from a sandstone bed in the basal part of the Sakamotozawa Formation distributed in the Kamiyasse area of Kesennuma, South Kitakami Belt, Northeast Japan. The fauna includes Dutkevitchia? hindukushiensis, Pseudofusulina cf. callosa, Pseudochusenella ex gr. cushmani, Nipponitella sp., Eoparafusulina sp., and others, and is referable to the Sakmarian of the Early Permian. Thus, this study first clarified the age of the basal part of the Permian succession in the Kamiyasse area with solid paleontological evidence. It also suggests that the basal part of the Sakamotozawa Formation in this area is almost coeval with that in the type locality of the Nagaiwa-Sakamotozawa area farther to the northeast in the South Kitakami Mountains although the faunal compositions are essentially different in these two areas
Formoso M.l.l. - One of the best experts on this subject based on the ideXlab platform.
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An accurate record of volcanic ash fall deposition as characterized by dispersed organic matter in a Lower Permian tonstein bed (Faxinal Coalfield, Paraná Basin, Brazil)
2021Co-Authors: Simas M.w., Guerra-sommer M, Mendonça J.g., Cazzulo-klepzig, Filho M., Formoso M.l.l.Abstract:For the first time, the dispersed organic matter in the tonstein layer interbedded with a coal seam in the Faxinal Coalfield (Sakmarian, Southern Paraná Basin, Brazil) is characterized. The deposition of clusters of pollen grains was highly influenced by the intense ash fall process that probably occurred during seasonal dehiscence of reproductive structures. The well-preserved phytoclasts with their upper and lower leaf cuticles stuck together indicate that the rapid fall of ash on this material hindered organic biodegradation. The preservation of seemingly autochthonous Botryococcus colonies at the top of the tonstein layer is evidence of the subaqueous deposition of this layer. The darkening in cuticles and xylem phytoclasts can be attributed to different causes: the thermal influence of ash fall during deposition, chemical effects of the ash, prolonged oxidation of organic matter in low water level conditions or the burning of plant organs by wildfires. Analyses of dispersed organic matter along the tonstein layer showed that the organic matter succession reflects the composition of different plant strata (herbaceous pteridophytes and arboreal glossopterids-cordaitaleans) around the deposition site
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An accurate record of volcanic ash fall deposition as characterized by dispersed organic matter in a lower Permian tonstein layer (Faxinal Coalfield, Paraná Basin, Brazil)
'Edicions de la Universitat de Barcelona', 2013Co-Authors: Simas M.w., Guerra-sommer M, MendonÇa Filho J.g., Cazzulo-klepzig M., Formoso M.l.l.Abstract:For the first time, the dispersed organic matter in the tonstein layer interbedded with a coal seam in the Faxinal Coalfield (Sakmarian, Southern Paraná Basin, Brazil) is characterized. The deposition of clusters of pollen grains was highly influenced by the intense ash fall process that probably occurred during seasonal dehiscence of reproductive structures. The well-preserved phytoclasts with their upper and lower leaf cuticles stuck together indicate that the rapid fall of ash on this material hindered organic biodegradation. The preservation of seemingly autochthonous Botryococcus colonies at the top of the tonstein layer is evidence of the subaqueous deposition of this layer. The darkening in cuticles and xylem phytoclasts can be attributed to different causes: the thermal influence of ash fall during deposition, chemical effects of the ash, prolonged oxidation of organic matter in low water level conditions or the burning of plant organs by wildfires. Analyses of dispersed organic matter along the tonstein layer showed that the organic matter succession reflects the composition of different plant strata (herbaceous pteridophytes and arboreal glossopterids-cordaitaleans) around the deposition site
Guerra-sommer M - One of the best experts on this subject based on the ideXlab platform.
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An accurate record of volcanic ash fall deposition as characterized by dispersed organic matter in a Lower Permian tonstein bed (Faxinal Coalfield, Paraná Basin, Brazil)
2021Co-Authors: Simas M.w., Guerra-sommer M, Mendonça J.g., Cazzulo-klepzig, Filho M., Formoso M.l.l.Abstract:For the first time, the dispersed organic matter in the tonstein layer interbedded with a coal seam in the Faxinal Coalfield (Sakmarian, Southern Paraná Basin, Brazil) is characterized. The deposition of clusters of pollen grains was highly influenced by the intense ash fall process that probably occurred during seasonal dehiscence of reproductive structures. The well-preserved phytoclasts with their upper and lower leaf cuticles stuck together indicate that the rapid fall of ash on this material hindered organic biodegradation. The preservation of seemingly autochthonous Botryococcus colonies at the top of the tonstein layer is evidence of the subaqueous deposition of this layer. The darkening in cuticles and xylem phytoclasts can be attributed to different causes: the thermal influence of ash fall during deposition, chemical effects of the ash, prolonged oxidation of organic matter in low water level conditions or the burning of plant organs by wildfires. Analyses of dispersed organic matter along the tonstein layer showed that the organic matter succession reflects the composition of different plant strata (herbaceous pteridophytes and arboreal glossopterids-cordaitaleans) around the deposition site
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HEPATICITES IPORANGAE N. SP., RIO BONITO FORMATION, EARLY PERMIAN (Sakmarian), PARANA BASIN, BRAZIL, WESTERN GONDWANA
EUA, 2015Co-Authors: Ricardi-branco F, Rs Feria, Jasper A, Guerra-sommer MAbstract:Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)The formal description of a liverwort from the Parana Basin is presented. The fossil was found in the Rio Bonito Formation, Early Permian (Sakmarian), and is identified as a new species of the genus Hepaticites, named H. iporangae n. sp. The samples studied were collected from the macrofossil-rich roof-shale layer of the Quiteria Outcrop in the municipality of Encruzilhada do Sul, state of Rio Grande do Sul, Brazil. H. iporangae is one of the oldest liverworts reported from South America. The fossil described here provides more evidence of the relative diversity of liverworts in Paleozoic Gondwana despite the severe climatic conditions during the glaciations of the Permo-Carboniferous.852360368Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Foundation for the Support of Research of the state of Rio Grande do Sul (FAPERGS)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)FAPESP [06/1365-9
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An accurate record of volcanic ash fall deposition as characterized by dispersed organic matter in a lower Permian tonstein layer (Faxinal Coalfield, Paraná Basin, Brazil)
'Edicions de la Universitat de Barcelona', 2013Co-Authors: Simas M.w., Guerra-sommer M, MendonÇa Filho J.g., Cazzulo-klepzig M., Formoso M.l.l.Abstract:For the first time, the dispersed organic matter in the tonstein layer interbedded with a coal seam in the Faxinal Coalfield (Sakmarian, Southern Paraná Basin, Brazil) is characterized. The deposition of clusters of pollen grains was highly influenced by the intense ash fall process that probably occurred during seasonal dehiscence of reproductive structures. The well-preserved phytoclasts with their upper and lower leaf cuticles stuck together indicate that the rapid fall of ash on this material hindered organic biodegradation. The preservation of seemingly autochthonous Botryococcus colonies at the top of the tonstein layer is evidence of the subaqueous deposition of this layer. The darkening in cuticles and xylem phytoclasts can be attributed to different causes: the thermal influence of ash fall during deposition, chemical effects of the ash, prolonged oxidation of organic matter in low water level conditions or the burning of plant organs by wildfires. Analyses of dispersed organic matter along the tonstein layer showed that the organic matter succession reflects the composition of different plant strata (herbaceous pteridophytes and arboreal glossopterids-cordaitaleans) around the deposition site
Stuart C Tye - One of the best experts on this subject based on the ideXlab platform.
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the lower permian wasp head formation sydney basin high latitude shallow marine sedimentation following the late asselian to early Sakmarian glacial event in eastern australia
Sedimentology, 2008Co-Authors: Michael C Rygel, Lauren P Birgenheier, Tracy D Frank, Christopher R Fielding, Kerrie L. Bann, Stuart C TyeAbstract:The Lower Permian Wasp Head Formation (early to middle Sakmarian) is a ~95 m thick unit that was depos- ited during the transition to a non-glacial period following the late Asselian to early Sakmarian glacial event in eastern Australia. This shallow marine, sandstone-dominated unit can be subdivided into six facies associa- tions. (i) The marine sediment gravity flow facies association consists of breccias and conglomerates deposited in upper shoreface water depths. (ii) Upper shoreface deposits consist of cross-stratified, conglomeratic sand - stones with an impoverished expression of the Skolithos Ichnofacies. (iii) Middle shoreface deposits consist of hummocky cross-stratified sandstones with a trace fossil assemblage that represents the Skolithos Ichnofacies. (iv) Lower shoreface deposits are similar to middle shoreface deposits, but contain more pervasive bioturba- tion and a distal expression of the Skolithos Ichnofacies to a proximal expression of the Cruziana Ichnofacies. (v) Delta-influenced, lower shoreface-offshore transition deposits are distinguished by sparsely bioturbated carbo - naceous mudstone drapes within a variety of shoreface and offshore deposits. Trace fossil assemblages repre- sent distal expressions of the Skolithos Ichnofacies to stressed, proximal expressions of the Cruziana Ichnofacies. Impoverished trace fossil assemblages record variable and episodic environmental stresses possibly caused by fluctuations in sedimentation rates, substrate consistencies, salinity, oxygen levels, turbidity and other physio- chemical stresses characteristic of deltaic conditions. (vi) The offshore transition-offshore facies association con- sists of mudstone and admixed sandstone and mudstone with pervasive bioturbation and an archetypal to dis- tal expression of the Cruziana Ichnofacies. The lowermost ~50 m of the formation consists of a single deepening upward cycle formed as the basin transitioned from glacioisostatic rebound following the Asselian to early Sak- marian glacial to a regime dominated by regional extensional subsidence without significant glacial influence. The upper ~45 m of the formation can be subdivided into three shallowing upward cycles (parasequences) that formed in the aftermath of rapid, possibly glacioeustatic, rises in relative sea-level or due to autocyclic progra- dation patterns. The shift to a parasequence-dominated architecture and progressive decrease in ice-rafted de- bris upwards through the succession records the release from glacioisostatic rebound and amelioration of cli- mate that accompanied the transition to broadly non-glacial conditions.
