N01-06, Na Trang village, Lang Son City: Smithian, Vietnam

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Protozoa - Entactinaria - Tetrentactiniidae
Multisphaera triassorobusta Takahashi 2014
Shigeta et al. 2014
Protozoa - Entactinaria - Palaeoscenidiidae
Parentactinia nakatsugawaensis Sashida 1983
Shigeta et al. 2014
Protozoa - Entactinaria - Entactiniidae
? Plenoentactinia terespongia Takahashi 2014
Shigeta et al. 2014
? Retentactinia parvisphaera Takahashi 2014
Shigeta et al. 2014
Protozoa - Entactinaria - Thalassothamnidae
Triassothamnus verticillatus (Dumitrica 1980)
Shigeta et al. 2014
Protozoa - Spumellaria - Oertlispongidae
Paroertlispongus spinorientalis Takahashi 2014
Shigeta et al. 2014
Cephalopoda - Ceratitida - Xenoceltitidae
Xenoceltites variocostatus Brayard and Bucher 2008
(10 measurements)
Bivalvia - Pectinida - Claraiidae
Crittendenia australasiatica (Krumbeck 1924)
Crittendenia langsonensis Komatsu and Dang 2013
Not listed at this level in Shigeta et al., 2014
Bivalvia - Pectinida - Hunanopectinidae
Leptochondria bittneri (Kiparisova 1938)
Shigeta et al. 2014
Bivalvia - Ostreida - Posidoniidae
Bositra limbata (Guo 1985)
Shigeta et al. 2014
Conodonta - Ozarkodinida - Gondolellidae
? Icriospathodus zaksi (Buryi 1979)
Shigeta et al. 2014
Novispathodus informal sp. A Orchard 2005
Shigeta et al. 2014
Novispathodus pingdingshanensis (Zhao and Orchard 2007)
Shigeta et al. 2014
see common names

Geography
Country:Vietnam
Coordinates: 21.9° North, 106.7° East (view map)
Paleocoordinates:6.3° North, 98.3° East
Basis of coordinate:stated in text
Geographic resolution:small collection
Time
Period:Triassic Epoch:Early/Lower Triassic
Stage:Olenekian 10 m.y. bin:Triassic 1
Key time interval:Smithian
Age range of interval:251.30000 - 247.20000 m.y. ago
Stratigraphy
Formation:Bac Thuy
Stratigraphic resolution:bed
Stratigraphy comments: Upper Smithian
Lithology and environment
Primary lithology:gray lithified mudstone
Secondary lithology:nodular lithified "limestone"
Includes fossils?Y
Lithology description: Elongated spherical calcareous nodules (5-60 cm in length) in dark mudstone
Environment:carbonate indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Collection method comments: Repository: All cephalopod, gastropod, ostracod and conodont specimens are reposited at the National Museum of Nature and Science, Tsukuba. Bivalves are stored in the Faculty of Science, Kumamoto University, Kumamoto, and radiolarian specimens are stored at Tokyo Gakugei University, Koganei.
Metadata
Also known as:NT01-07
Database number:143597
Authorizer:M. Clapham Enterer:M. Clapham
Modifier:M. Clapham Research group:marine invertebrate
Created:2013-04-25 06:30:00 Last modified:2014-04-16 10:33:15
Access level:the public Released:2013-04-25 06:30:00
Creative Commons license:CC BY
Reference information

Primary reference:

46521. T. Komatsu, Y. Shigeta, T. H. Dang, C. T. Dinh, T. Maekawa and G. Tanaka. 2013. Crittendenia (Bivalvia) from the Lower Triassic (Olenekian) Bac Thuy Formation, An Chau Basin, northern Vietnam. Paleontological Research 17:1-11 [M. Clapham/M. Clapham]