Taizicun Fm
Type Locality and Naming
Turpan-Hami region. The naming section is located at South Mountain of the Lianmuqin Gully over 20 km west of the seat of Shanshan County and ~5 km south of Lianmuqin Township, Xinjiang. Named by Zhai Renjie in 1978.
Lithology and Thickness
Lower part is grayish white or gray pebbly sandstone, brick-red or brownish red muddy sandstone. Middle part is grayish white or cream-colored sandstone and alternating dark red sandy mudstone and mudstone. Upper part is brownish red, grayish purple and orange-yellow sandy mudstone and mudstone, with grayish green sandstone and marlstone. The rocks contain abundant calcareous concretions. The thickness is ~35–65 m. Generally speaking, the formation thins and the lithology becomes coarse progressively from west to east in the west part of the basin.
Relationships and Distribution
Lower contact
According to what is seen in the Huoyanshan area, the formation has a disconformable contact with the underlying Late Cretaceous Subashi Fm.
Upper contact
According to what is seen in the Huoyanshan area, the formation has a disconformable contact with the overlying Middle Eocene Liankan Fm. China Lexicon chart schematically shows its age relation as regionally below the Dabu Fm; with dashed age span of uppermost Danian through Thanetian.
Regional extent
The formation is mainly distributed at Shengjinkou, Subashi and Lianmuqin of Huoyanshan, as well as Hongshan and Taizicun. Now it is not yet clear whether the formation is distributed in the eastern part of the basin.
GeoJSON
Fossils
According to the records, besides the ostracod Eucypris and Limnocythere and the turtle Mongolemys tufanensis, the mammals in the Taizicun fauna also includes 5 orders, 8 families and 13 species of fossils, of which the families Prodinoceridae and Phanacolophidae are most abundant. Their elements are Pseudictops chaii, Tienshanilophus subashiensis, T. lianmuqinensis, Archaeolambda cf. planicanina, Prodinoceras turfanenses and Houyanotherium primigenum, and in addition there are fossils Mesonychids, Eurymylidae, etc.
Age
Depositional setting
Additional Information