Where: Vietnam (21.8° N, 106.7° E: paleocoordinates 6.3° N, 98.3° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: Owenites koeneni ammonoid zone, Bac Thuy Formation, Smithian (251.3 - 247.2 Ma)

• bed-level stratigraphic resolution

Environment/lithology: open shallow subtidal; lithified limestone

Size classes: macrofossils, microfossils

Preservation: mold/impression

Collection methods: 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.

Primary reference: Y. Shigeta, T. Komatsu, T. Maekawa and H. T. Dang. 2014. Olenekian (Early Triassic) stratigraphy and fossil assemblages in northeastern Vietnam. National Museum of Nature and Science Monographs 45:1-309 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 155509: authorized by Matthew Clapham, entered by Matthew Clapham on 15.04.2014

Creative Commons license: CC BY (attribution)