Trace fossils and their paleoenvironmental significance of the Permi-an–Triassic succession in the Gannan region of western Qinling
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Abstract:
Abundant trace fossils are found in the Permian Lopingian to Middle Triassic bathyal-abyssal strata of the Gannan region from Western Qinling, China, which can be distinguished into domichnia, fodinichnia, cubichnia and pascichnia. Fourteen ichnogenera were identified, including Arenicolites, Chondrites, Dictyodora, Diplichnites, Diplopodichnus, Helminthopsis, Laevicyclus, Lockeia, Nereites, Palaeophycus, ?Phycodes, Planolites, Protovirgularia, and Scolicia. The Lopingian Maomaolong Formation mainly consists of Protovirgularia, Dictyodora–Helminthopsipsis, and Diplichnites–Palaeophycus assemblages. These three trace fossil assemblages are mainly composed of fodinichnia and pascichnia, indicating a continen-tal slope environment. The Diplopodichnus–Planolites assemblage was identified in the Early Triassic Shan-ga-ling Group, which combining with associated lithology and sedimentary structures, suggest a base-of-slope apron environment. The Middle Triassic Gulangdi Formation is composed of Laevicyclus assemblage and diverse sedimentary structures, represent-ing a proximal-mid fan of turbidite fan environment.
