Selong Xishan, Bed 17 (Permian of China)

Where: Xizang, China (28.7° N, 85.8° E: paleocoordinates 52.5° S, 63.9° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: Kangshare Formation, Changhsingian (254.2 - 252.2 Ma)

• The contact between the Selong Group and the overlying Kangshare Formation is marked by the Caliche Bed, a thin layer of pedogenic calcrete which varies laterally in thickness. The Kangshare Formation is 7.0 m thick and is divided into three beds (Jin et al., 1996): Waagenites Bed, Otoceras Bed, and Ophiceras Bed. The Otoceras and Ophiceras Beds are Triassic in age.

• bed-level stratigraphic resolution

Environment/lithology: open shallow subtidal; lithified packstone

• This bed represents lag carbonate deposits formed in shallow, medium-energy shoal and in inter-shoal depressions.
• Bioclasts are finer in size and form around 35%, and sometimes less than 10%, of the rock. Bioclastics are usually well sorted, ranging from 0.5 mm to 2.0 mm in diameter. Packstone with poorly sorted bioclastics is also observed where the diameter of bioclastics may be up to 20 mm with slightly abraded unbroken crinoid stems. Contains greater amounts of ostracod and gastropod shells.

•JA: described by Shen et al. 2000 as a brown dolomitized crinoid packstone with brachiopods, corals, bryozoans, ostracods, foraminifers and calcareous sponges, above the "Caliche Bed", 0.07 m thick

Size class: macrofossils

Collected by S.Z. Shen in 1996,1998

Primary reference: S. Z. Shen, N. W. Archbold, G. R. Shi and Z. Q. Chen. 2000. Permian brachiopods from the Selong Xishan Section, Xizang (Tibet), China. Part 1: Stratigraphy, Strophomenida, Productida and Rhynchonellida. Geobios 33(6):725-752 [W. Kiessling/U. Merkel]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 117541: authorized by Matthew Clapham, entered by Matthew Clapham on 23.09.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Strophomenata
 Productida - Productellidae
"Krotovia arcuata" = Lazarevonia arcuata
"Krotovia arcuata" = Lazarevonia arcuata Waterhouse 1978
 Productida - Strophalosiidae
Marginalosia ? kalikotei
Marginalosia ? kalikotei Waterhouse 1975
Rhynchonellata
 Spiriferida - Elythidae
? Bullarina striata
? Bullarina striata Shen et al. 2001
 Spiriferida - Spiriferellidae
Spiriferella rajah, "Spiriferella qubuensis" = Arcullina qubuensis
Spiriferella rajah Salter 1865
"Spiriferella qubuensis" = Arcullina qubuensis Zhang 1976
 Athyridida - Athyrididae
Cleiothyridina sp.
Cleiothyridina sp. Buckman 1906