Trimurellina-"Eoconchidium" Comm., Huangnigang (Ordovician of China)

Where: Zhejiang, China (28.8° N, 118.6° E: paleocoordinates 1.7° N, 124.2° E)

• coordinate based on political unit

• local area-level geographic resolution

When: Nankinolithus nankinensis trilobite zone, Lower Member (Huangnigang Formation), Ashgill (449.5 - 443.7 Ma)

• "The composition of the fauna indicates a probably early Ashgillian age. The H. Fm. rests below the Wufeng Fm., graptolite-bearing equivalent, the Yuqian Fm. of the Ashgillian; it also lies above the Caradocian Pagoda Lst. equivalent."

• formation-level stratigraphic resolution

Environment/lithology: marine; calcareous mudstone

• "absence of dicoelosids or Skenidioides suggests, in presence of high number of plicate virgianids,...normal marine environment near BA3-4 boundary. However, P.M. Sheehan (written commun. 1982) concluded from the presence of Foliomena and Cyclospira that a deeper position is more likely."
• "shells occur in a calcareous, very fine-grained mudstone as scattered, disarticulated shells"

Size class: macrofossils

Primary reference: Y. Wang, A. J. Boucot, J.Y. Rong and X.C. Yang. 1987. Community paleoecology as a geologic tool: the Chinese Ashgillian-Eifelian (latest Ordovician through early Middle Devonian) as an example. Geological Society of America Special Paper 211:1-100 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 25864: authorized by Michael Foote, entered by Michael Foote on 26.09.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Brachiopoda
  -
Brachiopoda indet.
Brachiopoda indet. Cuvier 1805
"at least four other distinctive forms that have not yet been identified satisfactorily"
Strophomenata
 Strophomenida - Christianiidae
Christiania nilssoni
Christiania nilssoni Sheehan 1973
 Strophomenida - Sowerbyellidae
Sowerbyella sp.
Sowerbyella sp. Jones 1928
 Strophomenida - Hesperomenidae
Kassinella anisa, "Trimurellina sp." = Kassinella (Trimurellina)
Kassinella anisa Percival 1979
"Trimurellina sp." = Kassinella (Trimurellina) Mitchell 1977
 Strophomenida - Foliomenidae
Foliomena folium
Foliomena folium Barrande 1879
Rhynchonellata
 Pentamerida - Virgianidae
"Eoconchidium" sp.
"Eoconchidium" sp. Rozman 1967
form with marked fold and sulcus
 Atrypida - Cyclospiridae
? Cyclospira cf. scanica
 Atrypida - Atrypinidae
Eospirigerina sp.
Eospirigerina sp. Schuchert and Cooper 1930