T0 Early Permian coal-forest preserved in situ in volcanic ash bed in the Wuda Coalfield, Inner Mongolia, China

Opluštil, Stanislav; Wang, Jun; Pfefferkorn, Hermann W.; Pšenička, Josef; Bek, Jiřı́; Libertı́n, Milan; Wang, JinRong; Wan, Mingli; He, Xingyuan; Yan, Mengxiao; Wei, Hang; Frojdová, Jana Votočková

doi:10.1016/j.revpalbo.2020.104347

Cited by 8 publications

(3 citation statements)

References 65 publications

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“…In this paper, a similar physical model of the coal fire was established based on the geological conditions of the Wuda mining area in Inner Mongolia, China. 36 The length, width, and height of the model experimental platform were 2, 0.2, and 1 m, respectively. The length and width represent the strike and dip direction of the model, respectively.…”

Section: Building a Similar Physical Modelmentioning

confidence: 99%

Breaking law of overlying strata in shallow coal seam fire area under thermal–mechanical coupling effect

Zhu

Gao

et al. 2023

Energy Science & Engineering

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The cracks formed by the breaking and collapse of the overlying strata are the oxygen supply channels for the continuous combustion of coal fires. The development of cracks is of great significance for determining the scope of the fire area and controlling the fire efficiently and accurately. To study the development law of cracks, a breaking model of the overlying strata in the shallow coal seam fire area is established on the basis of beam theory considering the coupling effect of gravity load and temperature field. The physical model of the coal fire is established based on the similarity principle.The temperature data from rock strata in the model are monitored by the infrared thermal imager. The dynamic distribution function of the roof temperature field is obtained by fitting. According to the breaking model theory, the position of the maximum tensile stress on the roof of the shallow fire area is the middle of the lower surface. The theoretical calculation value of the first breaking distance of the roof is 0.575 m, which is consistent with the experimental results of the physical model. The maximum tensile stress of the roof under the thermal-mechanical coupling is slightly less than that under the load only. For shallow coal seams, the thermal stress generated by the coal fire increases the first breaking distance of the roof.

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Section: Building a Similar Physical Modelmentioning

confidence: 99%

Breaking law of overlying strata in shallow coal seam fire area under thermal–mechanical coupling effect

Zhu

Gao

et al. 2023

Energy Science & Engineering

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“…Lastly, evidence from in situ forests suggests that late Pennsylvanian forests, while taxonomically and vertically heterogeneous, had rather open canopy strata with spatially separated arborescent taxa resulting in little crown overlap (reviewed in DiMichele and Falcon-Lang, 2011, but see Opluštil et al, 2009Opluštil et al, , 2014. In contrast, Cisularian forests show evidence of denser communities, suggestive of more continuous canopy strata (Gulbranson et al, 2012;Wang et al, 2012;Luthardt et al, 2016), although less dense forests also occurred (Gulbranson et al, 2012;Opluštil et al, 2021). It could thus be argued that selective pressure for an aerial locomotion in a continuous canopy was minimal prior to the Cisularian, but this assumption requires further paleoecological studies, especially with respect to canopy density and continuity.…”

Section: Paleoecology Of Weigeltisauridsmentioning

confidence: 99%

The postcranial skeleton of the gliding reptileCoelurosauravus elivensisPiveteau, 1926 (Diapsida, Weigeltisauridae) from the late Permian of Madagascar

Buffa¹,

Frey

Steyer³

et al. 2022

Journal of Vertebrate Paleontology

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The postcranial skeleton of the gliding neodiapsid reptile Coelurosauravus elivensis (Lower Sakamena Formation, late? Permian, southwestern Madagascar) is redescribed in detail based on all previously referred specimens. The exquisite preservation of the material provides three-dimensional details of the individual bones, which are missing in the Laurasian weigeltisaurid material. A new skeletal reconstruction of C. elivensis is proposed including the first reconstruction of a weigeltisaurid reptile in lateral view. The reexamination of the material highlights interspecific differences in the postcranium of weigeltisaurids, in particular in the trunk and patagial spars. These animals have long been considered as arboreal and gliding reptiles. However, new information on the postcranium of C. elivensis reveals strong similarities with both extant and extinct quadrupeds specialized for a clinging arboreal lifestyle. Additionally, the presence of an additional phalanx in the fifth digit of the manus is now attested for all weigeltisaurids where this region is preserved. We suggest that this morphology could have allowed weigeltisaurids to grasp their patagium as observed in the extant gliding agamid Draco. Weigeltisaurids are thus the earliest known gliding vertebrates and some of the first tetrapods with an obligatory arboreal lifestyle, but also represent the only known vertebrates with a hyperphalangy aligned with a gliding apparatus.

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“…These have allowed lateral variation in the swamp vegetation at one stratigraphical level to be investigated; for instance, studies at the Štilec and Ovčín localities, about 20 km apart, yielded two contrasting assemblages, representing different stages of vegetation succession (Opluštil et al 2007(Opluštil et al , 2009a(Opluštil et al ,b, 2014Libertín et al 2009a). A similar situation is present in the earliest Permian Wuda ash bed that occurs over an area of more than 60 km 2 , enabling distinct assemblages to be recognised both vertically and laterally (Wang et al 2012;Opluštil et al 2020).…”

mentioning

confidence: 99%

Palaeobotanical experiences of plant diversity in deep time. 1: How well can we identify past plant diversity in the fossil record?

Cleal

Pardoe

Berry

et al. 2021

Palaeogeography, Palaeoclimatology, Palaeoecology

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T0 Early Permian coal-forest preserved in situ in volcanic ash bed in the Wuda Coalfield, Inner Mongolia, China

Cited by 8 publications

References 65 publications

Breaking law of overlying strata in shallow coal seam fire area under thermal–mechanical coupling effect

Breaking law of overlying strata in shallow coal seam fire area under thermal–mechanical coupling effect

The postcranial skeleton of the gliding reptileCoelurosauravus elivensisPiveteau, 1926 (Diapsida, Weigeltisauridae) from the late Permian of Madagascar

Palaeobotanical experiences of plant diversity in deep time. 1: How well can we identify past plant diversity in the fossil record?

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