Keziluoyi Fm
Type Locality and Naming
Kashi-Yarkand region (NW Tarim). The type section is located at Kzeziluoyi (E75°10′, N39°34′), Ulugqat County, northwestern Tarim Basin in Xinjiang. It was formally named by the Regional Stratigraphic Chart Editorial Group of Xinjiang Uygur Autonomous Region (RSCEGXUAR) (1981).
Lithology and Thickness
Lower member is formed by brownish-grey mudstones and sandy siltstones with gypsum laminations or blocks. The bottom of the lower member is a layer of granule conglomerate in about 0.5 m thickness. Upper member is characterized by a series of brownish-red mudstones and sandy mudstones interbedded with laminations of greyish-green siltstones and fine sandstones. It contains fossil ostracods, foraminifers, charophytes, and sporopollens. Its thickness is in range of 280~1000 m.
Relationships and Distribution
Lower contact
In the type section, the Keziluoyi Fm disconformably contacts with the underlying Eocene or Oligocene Bashibulake Fm (=Baxbulake Fm).
Upper contact
In the type section, the Keziluoyi Fm is conformably overlain by the Miocene Anjuan Fm.
Regional extent
The formation is restricted in Ulugqat area, northwestern Tarim Basin.
GeoJSON
Fossils
Ostrocods: Ilyocypris manasensis, Cyrpinotus (Heterocypris) daductus, Potamocypris reflecta, Cytheridea sp., Hemicyprinotus valvaetumidus, Candona (Pseudocandona) subequalis, Limnoncythere aligra, Cyclocypri cavernosa, Eucypris longa, Ilyocypris dunschanensis, I. errabundis, Dawinula stenvensoni, Paijenborchella tricostata, Trachyleberis kashkarensis. Foraminifers: Quinqueloculina sp., Nonionella hebes, N. sp., Boliuna sp., Anomalina sp., Cibicides sp., Ammonina beccarii, A. limnetes, A. tepida, A. honyaensis, Cibicidina sp., Florilus sp., Rotalia lacera. Charophyte: Chara sp..
Age
Depositional setting
It is interpreted as a river or riverside depositional environment.
Additional Information