Shezi Fm
Type Locality and Naming
The type section is located at Shezi Village near the Burma Road 4 km north of Feng Country and Langping Town, Yunnan. It was named by Chen Guangyuan, Zhang Kai and Xu Hongyou in 1943. It is equivalent to the uppermost coal-bearing strata of Yipinglang Coal Measure, which lies between Fengjiahe Fm of Lower Jurassic and Ganhaizi Fm of Upper Triassic, and represents the middle and late Late Triassic. Lu Zhaoqia and Wang Hengsheng (1936) established the Yipinglang Coal Series, which was dated as the Late Triassic. In 1943, Chen Guangyuan et al. further divided Yipinglang Coal Measures into Pujiacun Fm, Ganhaizi Fm and Shezi Fm in order, and regarded as the Late Triassic Norian.
Synonym: Shezhi Fm (spelling).
Lithology and Thickness
Lower part is mainly composed of grayish-black, yellowish-green and yellowish-brown carbonaceous shale intercalated with coal seams. Upper part is mainly composed of grayish-green, yellowish-green, purple, purplish-red sandstone and fine sandstone intercalated with mudstone.
Relationships and Distribution
Lower contact
The Shezi Fm is conformable in contact to the sandstone and siltstone of underlying Ganhaizi Fm with a bed of grayish-yellow, gray block medium sandstone.
Upper contact
This formation is conformable in contact to the purplish-red mudstone and grayish-green, grayish-purple quartz sandstone of overlying Fengjiahe Fm or Xialvfeng Fm
Regional extent
The formation is distributed widely along the Lvzhi river and Yilangping. The thickness varies largely ranging from 320 to 671 m. This formation is equivalent to the Shezi Fm in Lvfeng, Baoding Fm in Yongren, and Baitutian Fm in Xiangyun.
GeoJSON
Fossils
Bivalves: Modiolus aff. frugi；Plants: Dictyophyllum nathorsti, Clathropteris meniscioides, Ptilozamites chinensis, Pterophyllum ptilum, Anthrophyopsis crassinervis; Ostracoda: Darwinula medialis; Conchostracans: Euestheria minuta.
Age
Depositional setting
It is interpreted as coal-bearing deposits in marine and continental interchange.
Additional Information