Tantou Fm
Type Locality and Naming
The naming section is located near Tantou Township ~25 km northeast of Luanchuan County, Henan. Named by Zhang Renjie in 1974.
Lithology and Thickness
Mainly grayish green, grayish white and grayish black mudstone, shale, oil shale and marlstone with sandstone. The lithology shows certain lateral change. In the vicinity of Tanyugou, Luanchuan County, the Lower part is grayish brown conglomerate with grayish green pebbly sandstone and sandy mudstone or alternating beds of them; the Middle part, mainly yellowish green mudstone with grayish brown, grayish white and grayish black sandstone, marlstone and oil shale; the Upper part, grayish yellow, yellowish green and grayish black mudstone, marlstone and oil shale. In the vicinity of Gaoyugou the lithology becomes fine; in the vicinity of Baizhuang about 5 km northeast of Tantou mainly light yellow sandy conglomerate is found. The thickness is about 130–450 m.
Relationships and Distribution
Lower contact
It has a conformable contact with the underlying Middle Paleocene Dazhang Fm.
Upper contact
Its upper part was eroded; so the top is not observed. Regionally, the next younger unit is the Lushi Fm.
Regional extent
This formation is distributed at Gaoyugou, Tanyugou, Tantou, Baizhuang and Ganlusi in Luanchuan County, and a similar horizon is possibly exposed in the vicinity of Dazhang, Songxian County.
GeoJSON
Fossils
This formation contains bivalves, ostracods, the turtles Sinoharianus sichuanensis and mammals. Ostracods occur in the middle and upper parts of the formation, mainly including such species as Cypris henanensis and Sinocypris funingensis. Fossil mammals occur in the middle part of the formation, mainly represented by Prodinoceratinae and Pantolambdodontidae (including Archaeolambdidae).
Age
Depositional setting
It is interpreted to lacustine-swampy deposits.
Additional Information