Xiaoling Fm
Type Locality and Naming
It was named by Wang Yu and others as the “Xiaoling Volcanics” in 1954. The naming section is located in the area of the Xiaoling Mts, Benxi City, Liaoning Province, with its reference section being situated to the west of the Dongcha River of Huairen County and in the area extending from the Qiujiabao Fortress to the Shangdabao Fortress of Xinbin County.
Synonym: （小岭组）
Lithology and Thickness
Lower part is composed of sandy conglomerate, andesite, andesitic breccia, tuff and lava breccia, with a thickness of about 232 m. Middle part is andesite, basalt and rhyolitic volcaniclastics, with a thickness of 1222 m. Upper part is andesite, breccia, olivine-basalt and andesitic lithic-crystal tuff, with a thickness of about 295 m. The total thickness is 1749 m.
Relationships and Distribution
Lower contact
Its basal part is in a conformable contact with the underlying Xiaodonggou Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Oiushugou Fm [Not found in Lexicons or Strat-names of China]. Next younger unit in schematic strat column is the Nie'erku Fm (No Lexicon entry; but Geol. Formation Names of China: " grayish black siltstone and shale, with interbeds of gravel-bearing sandstone and coal seams; type section Nie’erku close to Zamu Township, south of Xinbin County, Liaoning Province)
Regional extent
It is distributed essentially in the Benxi, Xinbin and Youyan counties and Dandony City of southern Liaoning. Its thickness is varying in a range from 900 m to 3000 m.
GeoJSON
Fossils
In the Zhangjiawopu area of the Huanghuadianzi Pasture, Youyan County the formation is found to yield a small amount of plant fossils such as Acanthopteris gothani, Onychiopsis psilotoides, Cladophlebis delicatula, Ginkgo sibirica and Pityophyllum spp., and to yield “conchostracan” fossils as represented by Eosestheria aff. qingquanensis, Yanjiestheria cf. binggouensis, as well as Ostracoda fossils as represented by Cypridea sp. and Darwinula legumiella in the Hongmiaozi Basin of Xinbin County.
Age
Depositional setting
The formation to volcanic eruption-facies and lacustrine-facies deposits formed during the eruption interval.
Additional Information