Where: Thailand (18.5° N, 100.5° E: paleocoordinates 13.4° N, 105.2° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Phra Wihan Formation, Berriasian to Berriasian (145.0 - 125.0 Ma)

• Unit ms4. These fossiliferous beds represent a short period during deposition in the Upper Triassic to Upper Jurassic Nan - Phayao Basin. The exact stratigraphic age of the fossils is unknown due to the lack of index species in the non-marine series. Ward & Bunnag (1964) suggested a Middle Jurassic age for the Phra Wihan Formation from its relative position within the succession.

• bed-level stratigraphic resolution

Environment/lithology: lacustrine; lithified, black, gray shale

Size classes: macrofossils, mesofossils

Preservation: adpression

Collection methods: Repository: Department of Mineral Resources, Geological Survey Division, Thailand (TF-numbers); Institute of Systematics and Evolution of Animals, Polish Academy of Sciences, Krakow (IF/MP)

Primary reference: H. Heggemann, R. Kohring, and T. Schlüter. 1990. Fossil plants and arthropods from the Phra Wihan Formation, presumably Middle Jurassic, of northern Thailand. Alcheringa 14:311-316 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 122855: authorized by Matthew Clapham, entered by Matthew Clapham on 06.01.2012

Creative Commons license: CC BY (attribution)