R Shell Bed (Triassic to of China)

Where: Guizhou, China (26.3° N, 106.7° E: paleocoordinates 13.3° N, 95.1° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Leidapo Member (Qingyan Formation), Middle Triassic to Middle Triassic (247.2 - 242.0 Ma)

• The Middle Triassic succession at Qingyan is lithologically divided into the Qingyan and Guiyang Formations. The Qingyan Formation is an 890 m-thick succession composed of five members: Xiaoshan, Mafengpo, Yingshangpo, Leidapo and Yuqing Members in ascending order. The Xiaoshan Member is dominated by grey medium- bedded limestone; the Mafengpo Member consists of dark mudstone; the Yingshangpo Member is composed of grey medium-bedded bioclastic limestone interbedded with black shale; and the Leidapo Member is characterized by black mudstone in the lower part and calcareous mudstone in the upper part.

• group of beds-level stratigraphic resolution

Environment/lithology: intrashelf or intraplatform reef; lithified packstone and lithified, black mudstone

• Qingyan was situated on a shallow carbonate bank, the junction between the carbonate platform in the north and west and a deep basin in the south and east during the Early and Middle Triassic times.
• brachiopod skeletal packstone. The Leidapo Member is characterized by black mudstone in the lower part and calcareous mudstone in the upper part.

Size class: macrofossils

Collection methods: surface (in situ), mechanical,

• brachiopod shell bed is yielded from the middle part of the Leidapo Member. shell slab, 60 cm x 30 cm x 5 cm, of the Leidapo Member at the Qingyan section.

Primary reference: J. Chen, Z. Chen, and J. Tong. 2010. Palaeoecology and taphonomy of two brachiopod shell beds from the Anisian (Middle Triassic) of Guizhou, Southwest China: Recovery of benthic communities from the end-Permian. Global and Planetary Change 73:149-160 [N. Bonuso/N. Bonuso]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 111855: authorized by Nicole Bonuso, entered by Nicole Bonuso on 29.06.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Rhynchonellata
 Rhynchonellida - Cyclothyrididae
"Septaliphoria sinensis" = Costirhynchopsis sinensis
"Septaliphoria sinensis" = Costirhynchopsis sinensis Yang and Xu 1966
 Rhynchonellida - Erymnariidae
 Rhynchonellida - Norellidae
 Terebratulida - Zeilleriidae
"Aulacothyris angustaeformis" = Sacothyris angustaeformis
"Aulacothyris angustaeformis" = Sacothyris angustaeformis Yang and Xu 1966
 Terebratulida - Angustothyrididae
"Rhaetina angustaeformis" = Angustothyris angustaeformis
"Rhaetina angustaeformis" = Angustothyris angustaeformis Boekh 1872
 Spiriferinida - Laballidae
Paralepismatina semiconica Yang and Xu 1966
 Spiriferinida - Mentzeliidae
Mentzelia mentzeli Dunker 1851
 Spiriferinida - Spiriferellinidae
 Spiriferinida - Lepismatinidae
Lepismatina hsui Wang 1955
 Athyridida - Neoretziidae
"Neoretzia fuchsi" = Schwagerispira fuchsi
"Neoretzia fuchsi" = Schwagerispira fuchsi Koken 1900