Wulipo Bed Fm
Type Locality and Naming
It was proposed by Rong Jiayu (1979). The type section is located near Xunlientien on the top of Wulipo, northwest of the Meitan County seat in northern Guizhou Province. The reference section is at Donggongsi, Zunyi City in northern Guizhou Province.
Synonym: (五里坡层)
Lithology and Thickness
It consists of yellow green shale and is merely 40 cm thick at Wulipo in Meitan. At Donggongsi in Zunyi the Wulipo Bed, 30 cm thick, is characterized by light yellow pelite.
Relationships and Distribution
Lower contact
It rests pseudo-conformably on the Baota Fm (Pagoda Fm) of the Ordovician. At Donggongsi in Zunyi, the Wulipo Bed, rests conformably on the Guanyingqiao Fm of the Upper Ordovician.
Upper contact
At Donggongsi in Zunyi the Wulipo Bed, rests conformably below the Longmaxi Fm. In northern Guizhou, it underlies the Niuchang Fm.
Regional extent
The Wulipo Bed is exposed only in northern Guizhou Province (i.e., the northern margin of the Central Guizhou Oldland).
GeoJSON
Fossils
At the type section locality the Wulipo Bed bears brachiopods Eospirigerina, Hindella, Coolinia, Dolerorthis, Rostricellula, Isorthis, Eostropheodonta, Eospirifer. At Donggongsi the main fossils are also brachiopods Dalmanella, Eospirigerina, Hindella. According to stratigraphic sequence and regional correlation the Wulipo Bed probably corresponds to the age span from the Glyptograptus persculptus zone to the Akidograptus acuminatus zone, i.e. straddling the prevalent boundary of the Ordovician-Silurian systems.
Age
Depositional setting
Additional Information