Nam Sam Formation, Sam Nua Basin, NE Laos (Triassic of Laos)

Where: Laos (20.5° N, 104.0° E: paleocoordinates 5.6° N, 94.1° E)

• coordinate estimated from map

• basin-level geographic resolution

When: Nam Sam Formation, Anisian (247.2 - 242.0 Ma)

• 1200-1400 m thick. Fossils largely in upper part.

• formation-level stratigraphic resolution

Environment/lithology: marine; siliciclastic sediments

• Siltstone, clay shale, and sandstone in upper part (largely volcanic and volcaniclastic in lower). Fossils in fine-grained rocks.

Size class: macrofossils

Primary reference: V. Khuc. 2000. The Triassic of Indochina Peninsula and its interregional correlation. Permian-Triassic Evolution of Tethys and Western Circum-Pacific 221-233 [D. Bottjer/M. Clapham/M. Clapham]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 44797: authorized by David Bottjer, entered by Matthew Clapham on 17.09.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

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Bivalvia
 Ostreida - Posidoniidae
Posidonia aequilatera
 Trigoniida - Myophoriidae
Costatoria curvirostris
Cephalopoda
 Ceratitida - Ceratitidae
Paraceratites trinodosus, Kellnerites samneuaensis
Paraceratites trinodosus von Mojsisovics 1878 ceratite
 Ceratitida - Balatonitidae
Cuccoceras sp.
Cuccoceras sp. Diener 1907 ceratite
 Ceratitida - Acrochordiceratidae
Acrochordiceras sp.
Acrochordiceras sp. Hyatt 1877 ceratite