Honglingshan Fm
Type Locality and Naming
The type section is located nearby Dongshan in Shili Township, 12.5 km south of Xihe County, Gansu Province. It was named by Du Yuansheng et al. in 1988.
Lithology and Thickness
Limestone. The thickness is 310.6 m in total . Lower part is light-gray to gray medium-bedded packstone intercalated with marl, thick-bedded to massive boundstone and packstone.
Middle part of the formation is of gray to dark-gray middle- to thick-bedded banded bioclastic algal packstone.
Upper part is composed of light-gray to gray thick-bedded to massive bio-packstone, skeleton limestone intercalated with medium-bedded dark-gray bioclastic marl.
Relationships and Distribution
Lower contact
Conformably overlies the Huangjiagou Fm (equivalent to the upper part of the Anjiacha Fm).
Upper contact
Conformably overlain by the Shuanglanggou Fm
GeoJSON
Fossils
Its limestone contains a succession of conodonts: the varcus zone, the hermani-cristatus zone, the disparilis zone, the asymmetricus zone, the triangularis zone and the gigas zone; the associated fossils are coral, stromatopora, brachiopod, crinoids.
Age
Depositional setting
It is interpreted as a shelf, platform and biohermal facies, but southwards to the area of Yeshuihe and Tantuguan, it gradually transitions into shelf facies deposits.
Additional Information