Ko Muk Island, Collection 6 (Permian of Thailand)

Where: Thailand (7.4° N, 99.3° E: paleocoordinates 33.2° S, 122.6° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Lower Formation (Phuket Group), Asselian (298.9 - 295.5 Ma)

• An interval of rock some 65 m thick lies between the fossil bands and Kungurian Rat Buri Limestone, potentially including beds equivalent to Sakmarian upper Ko Yao Noi Formation - suggests late Asselian age; Equivalent to Kaeng Krachan Group

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, pebbly mudstone

• Sediments consist mostly of sandstone and siltstone, frequently with small scattered pebbles, rounded or angular, composed chiefly of quartz, limestone, granite, or granodiorite, up to 10 cm in diameter. Calcareous beds are rare and a few layers have been burrowed.

Size class: macrofossils

Preservation: mold/impression

Primary reference: J. B. Waterhouse. 1982. An Early Permian cool-water fauna from pebbly mudstones in south Thailand. Geological Magazine 119(4):337-354 [D. Bottjer/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 40153: authorized by David Bottjer, entered by Matthew Clapham on 18.06.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Strophomenata
 Productida - Monticuliferidae
"Cancrinelloides monticulus" = Bandoproductus monticulus
"Cancrinelloides monticulus" = Bandoproductus monticulus Waterhouse 1982
24 ventral valves
Rhynchonellata
 Spiriferida - Trigonotretidae
Sulciplica thailandica Hamada 1960
2 ventral valves
 Rhynchonellida - Rhynchoporidae
Rhynchopora culta Waterhouse 1982
1 ventral valve, 1 dorsal, 1 articulated