Reer Gr
Type Locality and Naming
The type section is located at the area 55 km north of Ruoerge County, Sichuan (northernmost Sichuan at border with Gansu; south Qinling tectonic region). It was named by Xi’an Institute of Geology and Mineral Resources and No. 1 Team of Gansu Regional Geological in 1973, and published by Qinfeng and Ganyan in 1976.
Lithology and Thickness
Siltstone, Sandstone, Limestone. Lower part of the Group, 500 m thick, is composed of a variegated alternation of siltstone, sandstone and shale intercalated with thin- to medium-bedded limestone and clayey limestone. Upper part, 1223.6 m thick, consists of cyclic deposits of purplish-red and grayish-green conglomerate, pebbly sandstone and sandstone siltstone. Eastward, the clastics of the Lower part become coarser grained and increase in thickness, and the clastics of the Upper part become finer grained and decrease in thickness.
Relationships and Distribution
Lower contact
It rests conformably on the Silurian Bailongjiang Gr
Upper contact
Major unconformity. No Middle through Late Devonian "for this reference column"; lack of exposure?
Regional extent
Major unconformity. No Middle through Late Devonian "for this reference column"; lack of exposure?
GeoJSON
Fossils
Lower part of the Group contains abundant coral Squameofavosites thetidis, Favosites admirabilis, Lecomptia sp., Qinlingopora sp., and brachiopods Protothyris sp., Howellella sp.
Upper part yields plant Zosterophyllum cf. yunnanicum, Drepnophycus spinaeformis and Taeniocrada cf. decheniana.
Age
Depositional setting
Additional Information