Locality B50, 18 km northeast of Amdo, Qiangtang Terrane (Jurassic of China)

Where: Xizang, China (32.5° N, 91.8° E: paleocoordinates 15.2° N, 87.4° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Sewa Formation, Kimmeridgian (157.3 - 152.1 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: basinal (siliceous); lithified, gray mudstone

• shelf basinal facies
• grey mudrock

Size classes: macrofossils, microfossils

Collection methods: Paleontological collections made on the 1985 Geotraverse.

Primary reference: A. B. Smith and J. Xu. 1988. Palaeontology of the 1985 Geotraverse, Lhasa to Golmud. Philosophical Transactions of the Royal Society of London A 327:53-105 [M. Aberhan/S. Nurnberg/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 61451: authorized by Martin Aberhan, entered by Sabine Nürnberg on 12.06.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Mendicodinium
  -
Paragonyaulacysta
  -
Dapcodinium
  -
Dichadogonyaulax
  -
Ambonosphaera
  -
Cephalopoda
 Ammonitida - Ataxioceratidae
Katroliceras sp. Spath 1924 ammonite
 Ammonitida - Perisphinctidae
? Torquatisphinctes sp. Spath ammonite
probably Torquatisphinctes
Bivalvia
 Pectinida - Entoliidae
Entolium sp. Meek 1865 scallop
 Pectinida - Pectinoidae
Chlamys sp. Röding 1798 scallop
Radulopecten sp. Rollier 1911 scallop
 Ostreida - Palaeolophidae
Actinostreon sp. Bayle 1878 oyster
 Ostreida - Gryphaeidae
cf. Gryphaea hennigi oyster
exogyriform oyster cf. 'Gryphaea' hennigi
 Mytilida - Mytilidae
Inoperna sp. Conrad 1873 mussel
 Pholadomyida - Pholadomyidae
Pholadomya cf. hemicardia clam
listed as Pholadomya cf. hemicaredia
 Cardiida - Arcticidae
Arcticidae indet. Newton 1891 clam
Rhynchonellata
 Rhynchonellida -
Rhynchonellida indet. Kuhn 1949
indet. rhynchonellids
Dinophyceae
  - Pareodiniaceae
Pareodinia ceratophora Deflandre 1947
dinoflagellate
 Gonyaulacales - Gonyaulacaceae
 Peridiniales - Peridiniaceae
Subtilisphaera sp. Jain and Millepied 1971
dinoflagellate