TRACE FOSSILS FROM THE UPPER MEMBER OF LOWER SILURIAN TATAAIERTAGE FORMATION, KALPIN AREA,TARIM BASIN, XINJIANG, CHINA
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Abstract:
Based on the study of the Silurian sections in the Kalpin area of the northwestern Tarim Basin, eight ichnogenus and eight ichnospecies were recognized in the Lower Silurian Tataaiertage Formation. According to the composition, occurrence and distribution characteristics of these trace fossils and their host rock features, two types of ichnoassemblages under different sedimentary environments have been proposed as follows: 1)Thalassinoides-Macaronichnus ichnoassemblage, including such common trace fossils as Thalassinoides suevicus,Macaronichnus segregatis and Rhizocorallium ganxiensis, indicating a sand flat sedimentary environment with high oxygen content and energy; and 2) Scoyenia-Beaconites ichnoassemblage, containing such trace fossils as Scoyenia gracilis, Beaconites antarcticus, Planolites vulgaris, Palaeophycus wutingensis and Monocraterion cf.tentaculatum, suggesting a mixed sand flat-mud flat sedimentary environment with mid-low energy condition.
