Lumeiyi Fm
Type Locality and Naming
The naming section is located between Shilin and Lumeiyi, Lunan County, Yunnan. Named by Zheng Jiajian et al. in 1978.
Lithology and Thickness
Base is a conglomerate bed or pebbly sandstone; Lower part is dominated by sandy mudstone alternating or intercalated with muddy sandstone, with marlstone predominating. According to Zheng Jiajian et al. (1978), the thickness of the formation measured in the Shilin-Lumeiyi section is over 535 m, while the thickness in the Shangpucao Village-Lunan section is over 752 m.
Relationships and Distribution
Lower contact
The formation has an unconformable contact with the underlying Paleozoic grayish black and gray, thick-bedded limestone.
Upper contact
The upper part is covered by regolith and is probably in disconformable contact with the Late Eocene Xiaotun Fm.
Regional extent
It is mainly exposed at Lumeiyi, Lunan, Taoyuan, Anren Village, Dayemaban and Dake.
GeoJSON
Fossils
The formation yields abundant vertebrates, especially mammals. From the upper and lower horizons, two parts may be broadly distinguished. In the lower horizon these are such genera as Protitan, Lophialetes, Breviodon, Helaletes, Prohyracodon, Teilhardia, Caenolophus, Amynodon and Gobiohyus. Although some of these genera are found in the Shara Murun fauna, most of them are similar to related genera in the Irdin Manha fauna. In the upper horizon there are such genera as Teleolopthus, Prohyracodon, “Indricotherium” and Ilianodon, some of which are more advanced than those in the lower horizon. Therefore, according to the fossils, combined with the properties of sediments and sequence of strata, the geologic age of the Lumeiyi Formation should be late Middle Eocene.
Age
Depositional setting
Additional Information