Study on the Geological Environmental Disturbance and Reclamation Technology of Underground Coalmines: A Case Study, Xinjiang, China

Zhang, Zhiyi; Su, Hui; Guan, Wutai

doi:10.1007/s10706-022-02364-7

“…In the Devonian, western Junggar belonged to the Kazakhstan Block in the Northern Hemisphere. The marine deposits are rich in trilobite fossils in this area, but most of these trilobites have been listed only briefly in the Geological Survey Reports from the 1960s to the 1980s or simply described in the Paleontological Atlas of Northwest China (Xinjiang part) (Zhang, 1983). Only a few species have been systematically studied (Xiang, *Corresponding author.…”

Section: Introductionmentioning

confidence: 99%

Variation in eye lenses of two new Late Devonian phacopid trilobites from western Junggar, NW China

Zong

¹

2023

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The suborder Phacopina, characterized by schizochroal eyes, is among the most common groups of trilobites in Devonian strata. The marine sediments of the Famennian in western Junggar, Xinjiang, contain abundant low-disparity phacopids, which have previously been designated to Omegops accipitrinus mobilis, Phacops circumspectans tuberculosus, and Omegops cornelius on the basis of small numbers of poorly preserved specimens. In this study, these phacopids were identified as two new species of Omegops, O. honggulelengensis n. sp. and O. xiangi n. sp., on the basis of nearly 200 well-preserved specimens. The intraspecific variations of eye lenses of these specimens were quantitatively analyzed. On the basis of differences in the total number, number of dorsoventral files, and arrangement of the eye lenses, the absence of lenses in the middle part of the visual surface, and asymmetry of the number and/or arrangement of lenses in the two eyes, it was concluded that the reasons for intraspecific variation in eye lenses of Late Devonian Omegops from western Junggar were different from previously described factors but were likely genetic or embryological malfunctions or abnormalities caused by pathological conditions. Diversity of lenses in the schizochroal eyes shows that the number and arrangement of eye lenses was not stable in Phacopina. Therefore, many specimens are needed for quantitative study to determine the true characteristics of the number or arrangement of eye lenses when these features are used in the systematic taxonomy of Phacopina. UUID: http://zoobank.org/6bd14390-05fe-45ad-8eeb-3bf397a46a68

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“…In the Devonian, western Junggar belonged to the Kazakhstan Block in the Northern Hemisphere. The marine deposits are rich in trilobite fossils in this area, but most of these trilobites have been listed only briefly in the Geological Survey Reports from the 1960s to the 1980s or simply described in the Paleontological Atlas of Northwest China (Xinjiang part) (Zhang, 1983). Only a few species have been systematically studied (Xiang, *Corresponding author.…”

Section: Introductionmentioning

confidence: 99%

Variation in eye lenses of two new Late Devonian phacopid trilobites from western Junggar, NW China – CORRIGENDUM

Zong¹

2023

J. Paleontol.

0

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The suborder Phacopina, characterized by schizochroal eyes, is among the most common groups of trilobites in Devonian strata. The marine sediments of the Famennian in western Junggar, Xinjiang, contain abundant low-disparity phacopids, which have previously been designated to Omegops accipitrinus mobilis, Phacops circumspectans tuberculosus, and Omegops cornelius on the basis of small numbers of poorly preserved specimens. In this study, these phacopids were identified as two new species of Omegops, O. honggulelengensis n. sp. and O. xiangi n. sp., on the basis of nearly 200 well-preserved specimens. The intraspecific variations of eye lenses of these specimens were quantitatively analyzed. On the basis of differences in the total number, number of dorsoventral files, and arrangement of the eye lenses, the absence of lenses in the middle part of the visual surface, and asymmetry of the number and/or arrangement of lenses in the two eyes, it was concluded that the reasons for intraspecific variation in eye lenses of Late Devonian Omegops from western Junggar were different from previously described factors but were likely genetic or embryological malfunctions or abnormalities caused by pathological conditions. Diversity of lenses in the schizochroal eyes shows that the number and arrangement of eye lenses was not stable in Phacopina. Therefore, many specimens are needed for quantitative study to determine the true characteristics of the number or arrangement of eye lenses when these features are used in the systematic taxonomy of Phacopina.

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Cooperative Failure of Overburden-Surface and Its Control Measures in Longwall Mining

He

¹

,

Chen

²

,

Yang

³

et al. 2023

Geotech Geol Eng

2

0

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Study on the Geological Environmental Disturbance and Reclamation Technology of Underground Coalmines: A Case Study, Xinjiang, China

Cited by 4 publications

References 21 publications

Variation in eye lenses of two new Late Devonian phacopid trilobites from western Junggar, NW China

Variation in eye lenses of two new Late Devonian phacopid trilobites from western Junggar, NW China

Variation in eye lenses of two new Late Devonian phacopid trilobites from western Junggar, NW China – CORRIGENDUM

Cooperative Failure of Overburden-Surface and Its Control Measures in Longwall Mining

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