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Wang C.-Z.,Henan Polytechnic University | Wang J.,Henan Polytechnic University | Wang J.,Key Laboratory of Biogenic Traces & Sedimentary Minerals of Henan Province | Hu B.,Key Laboratory of Biogenic Traces & Sedimentary Minerals of Henan Province | Lu X.-H.,Henan Polytechnic University
Geodinamica Acta | Year: 2015

The Upper Cretaceous Gaogou, Majiachun and Sigou formations in the Xixia Basin are composed of terrestrial clastic deposits, which are dominated by red-violet mudstones, muddy siltstones, siltstones, grayish fine-grained sandstones, intercalated with grayish, off-white medium- and coarse-grained sandstones or conglomerates. They contain 10 ichnogenera and 22 ichnospecies and Rhizoliths, including Arenicolites isp., Archaeonassa isp., Beaconites antarcticus, B. capronus, B. coronus, Cylindricum isp., Gastruichnus xixiaensis, Palaeophycus megas, P. tubularis, P. heberti, P. sulcatus, P. cf. sulcatus, P. striatus, Planolites beverleyensis, P. isp., Scoyenia gracilis, Skolithos verticalis, S. linearis, S. isp., Taenidium irregularis, T. serpentinum and T. barretti. From north to south across the basin, alluvial fan, braided and meandering fluvial and fluvio-lacustrine systems are recognised on the basis of sedimentary features. In reference to them, four ichnoassemblages are recognised: (1) Skolithos-Gastruichnus ichnoassemblage in the channel environment of braided and meandering river, (2) Beaconites-Taenidium ichnoassemblage in the natural levee and crevasse splays, (3) Beaconites-Palaeophycus ichnoassemblage in the flood plain and (4) Taenidium-Scoyenia ichnoassemblage in the periodically exposed fluvio-lacustrine (pond or very shallow lacustrine) sedimentary environments. The present work not only enrich the trace fossils database of terrestrial origin but also offer new data to complete further continental ichnofacies mode and also provide the constraints on palaeoenvironments of the Xixia Basin. © 2015 Taylor & Francis


Song H.-B.,Henan Polytechnic University | Song H.-B.,Key Laboratory of Biogenic Traces & Sedimentary Minerals of Henan Province | Wang H.,Henan Polytechnic University | Wang F.,Henan Polytechnic University | And 2 more authors.
Geodinamica Acta | Year: 2015

Thirteen ichnogenera and seventeen ichnospecies were recognised in carbonate rocks from the Lower Permian Taiyuan Formation in North China Basin. Based on the composition, occurrence and diversity of ichnofossils, intensity of bioturbation, lithologic characteristics, especially on the variation of individual size and the filling colour diversities of the Zoophycos burrows, four types of ichnofabrics were recognised, that is (1) epigenic tiering ichnofabric – mainly appeared on or near the bedding plane and formed in restricted bay or lagoon sedimentary environments; (2) shallow tiering ichnofabric – developed less than 15 cm under the bedding plane and occurred in the upper shallow-marine environment; (3) medium tiering ichnofabric – mainly distributed from 15 to 20 cm under the bedding plane and generated in the mid-upper shallow sea (restricted–open platform); (4) deep tiering ichnofabric – distributed from 25 to 30 cm under the bedding plane and occurred in lower shallow sea (open platform) far from shore. Based on ichnological and sedimentological analyses above four types of ichnofabrics, the sedimentary environment model of the ichnofabrics in carbonate rocks from the Taiyuan Formation in North China Basin is proposed in this paper. © 2015 Taylor & Francis


Zhang L.,Henan Polytechnic University | Zhang L.,Key Laboratory of Biogenic Traces & Sedimentary Minerals of Henan Province | Zhao Z.,Henan Polytechnic University | Zhao Z.,Key Laboratory of Biogenic Traces & Sedimentary Minerals of Henan Province | Gong Y.,Wuhan University
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2015

In this paper, we review the biotic and environmental events by examining the trace fossil records in association with the 'Big 5' mass extinctions in Phanerozoic, including the transitions of Ordovician-Silurian, Frasnian-Famennian, Permian-Triassic, Triassic-Jurassic and Cretaceous-Paleogene. The benthic fauna reflected in the trace fossil records show a negative response to all of the 'Big 5' events, documented by the decreases in the ichnodiversity, burrow size, bioturbation depth, and ichnofabric tier. The behavior and food-feeding strategy of benthic fauna is found to vary among the 'Big 5' mass extinctions. The deposit-feeding strategy dominated after the mass extinctions during Ordovician-Silurian and Cretaceous-Paleogene transitions, whilst the suspension-feeding strategy dominated after the mass extinction during Triassic-Jurassic transition. Opportunistic trace fossils, such as Planolites, and both the deposit- and suspension-feeding strategies dominated after the mass extinctions during Frasnian-Famennian and Permian-Triassic transitions. The benthic ecosystems, reflected in the trace fossil records after the mass extinctions during Frasnian-Famennian and Permian-Triassic transitions, changed from simple to complex pattern, from two-dimensional to three-dimensional ecospace. ©, 2015, China University of Geosciences. All right reserved.

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