Selong Xishan, Waagenites Bed (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)

• Equivalent to Bed 17 in Shen et al. (2000). 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 1994

Primary reference: S. Shen and Y. Jin. 1999. Brachiopods from the Permian-Triassic boundary beds at the Selong Xishan section, Xizang (Tibet), China. Journal of Asian Earth Sciences 17:547-559 [T. Olszewski/L. Fall/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 51401: authorized by Tom Olszewski, entered by Leigh Fall on 03.06.2005, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

Strophomenata
 Strophomenida - Rugosochonetidae
"Tethyochonetes sp." = Fusichonetes1
"Tethyochonetes sp." = Fusichonetes1 Liao 1981
 Productida - Productellidae
"Krotovia arcuata" = Lazarevonia arcuata
"Krotovia arcuata" = Lazarevonia arcuata Waterhouse 1978
Rhynchonellata
 Rhynchonellida - Stenoscismatidae
"Stenoscisma selongensis n. sp." = Coledium selongensis
"Stenoscisma selongensis n. sp." = Coledium selongensis Shen and Jin 1999
 Spiriferida - Martiniidae
Martinia sp. M'Coy 1844
Martinia attenuatelloides n. sp. Shen and Jin 1999
 Spiriferida - Spiriferellidae
Spiriferella rajah Salter 1865
Spiriferella nepalensis Legrand-Blain 1976
 Spiriferida - Elythidae
? Bullarina striata2 Shen et al. 2001
 Athyridida - Athyrididae
"Cleiothyridina deroyssii" = Cleiothyridina deroissyi
"Cleiothyridina deroyssii" = Cleiothyridina deroissyi Leveille 1835
 Terebratulida - Cranaenidae
? Girtyella sp. Weller 1911