期刊
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
卷 485, 期 -, 页码 351-360出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.palaeo.2017.06.025
关键词
Ichnology; Opportunistic ichnotaxa; Biotic recovery; Diplocraterion; Longmendong section
资金
- Natural Science Foundation of China [41602112, 41290260]
- China Postdoctoral Science Foundation [2016M592288]
- Key Scientific Research Fund of University of Henan Province [17A17001]
- Specialized Research Fund for the Doctoral Program of Higher Education [20134116120002]
- Program for Innovative Research Team (in Science and Technology) in University of Henan Province [16IRTSTHN014]
- Natural Sciences and Engineering Research Council of Canada (NSERC) [311727-15, 311726-13]
New ichnological data from the Lower Triassic (Induan) Dongchuan Formation (Longmendong, South China) record the recovery interval of marginal-marine communities following the end-Permian mass extinction. Here, we document six ichnogenera from the upper part of the Dongchuan Formation of Dienerian (Early Triassic) age in the Longmendong area, Sichuan Province, South China. These are Cylindrichnus, Diplocraterion, Palaeophycus, Planolites, Siphonichnus, and Teichichnus, illustrating a depauperate Cruziana Ichnofacies. Facies analysis suggests that the depauperate Cruziana Ichnofacies is present in deposits recording the transition from fluvial to tide-dominated estuarine settings. Compilation of worldwide brackish-water ichnofaunas from Permian (average alpha ichnodiversity = 6.2) to Triassic (average alpha ichnodiversity = 5.5) suggests that no significant ichnodiversity decrease took place in these settings as a result of the mass extinction and further implies that the impact of the mass extinction may have been less severe in marginal-marine settings. Ichnofaunas in pre- and post-extinction marginal-marine environments are remarkably similar and tend to be dominated by facies-crossing ichnotaxa (e.g., Diplocraterion, Palaeophycus, Planolites) produced by opportunistic faunas. (C) 2017 Elsevier B.V. All rights reserved.
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