M Shell Bed: Middle Triassic - Anisian, China

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Rhynchonellata - Spiriferinida - Mentzeliidae
Mentzelia mentzeli (Dunker 1851)
38 specimens
Madoia sp. Sun and Ye 1982
73 specimens
Rhynchonellata - Spiriferinida - Sinucostidae
Sinucosta sp. Dagys 1963
38 specimens
Rhynchonellata - Spiriferinida - Spiriferellinidae
Pseudospiriferina multicostata Yang and Xu 1966
Rhynchonellata - Rhynchonellida - Cyclothyrididae
Septaliphoria sinensis Yang and Xu 1966
23 specimens
recombined as Costirhynchopsis sinensis
Rhynchonellata - Rhynchonellida - Norellidae
Diholkorhynchia sinensis (Koken 1910)
11 specimens
Nudirostralina minima
Costinorella sp. Dagys 1974
Rhynchonellata - Rhynchonellida - Erymnariidae
Crurirhynchia subssicostata
9 specimens
Rhynchonellata - Terebratulida - Zeilleriidae
Aulacothyris angustaeformis Yang and Xu 1966
35 specimens
recombined as Sacothyris angustaeformis
Rhynchonellata - Terebratulida - Angustothyrididae
Rhaetina angustaeformis (Boekh 1872)
55 specimens
recombined as Angustothyris angustaeformis
see common names

Geography
Country:China State/province:Guizhou
Coordinates: 26.3° North, 106.7° East (view map)
Paleocoordinates:13.3° North, 95.1° East
Basis of coordinate:stated in text
Geographic resolution:small collection
Time
Period:Triassic Epoch:Middle Triassic
10 m.y. bin:Triassic 2
Key time interval:Middle Triassic - Anisian
Age range of interval:247.20000 - 237.00000 m.y. ago
Stratigraphy
Formation:Qingyan Member:Yingshangpo
Stratigraphic resolution:group of beds
Stratigraphy comments: 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.
Lithology and environment
Primary lithology:gray lithified wackestone
Secondary lithology:black lithified packstone
Includes fossils?Y
Lithology description: the Yingshangpo Member is composed of grey medium-bedded bioclastic limestone interbedded with black shale. Brachiopod skeletal packstone-wackestone.
Environment:intrashelf/intraplatform reef
Geology comments: 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
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Temporal resolution:snapshot
Collection methods and comments
Collection excludes:some macrofossils
Collection methods:surface (in situ),mechanical,field collection
Collection size:400 specimens
Reason for describing collection:paleoecologic analysis
Collection method comments: Brachiopod specimens statistically studied in this paper were obtained from one shell slab, 45 cm x 25 cm x 10 cm, of the Yingshangpo Member and another shell slab, 60 cm x 30 cm x 5 cm, of the Leidapo Member at the Qingyan section.
Metadata
Database number:111833
Authorizer:N. Bonuso Enterer:N. Bonuso
Modifier:N. Bonuso Research group:marine invertebrate
Created:2011-06-29 04:38:45 Last modified:2011-06-28 15:02:49
Access level:the public Released:2011-06-29 04:38:45
Creative Commons license:CC BY
Reference information

Primary reference:
36557. 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]