Ko Muk Island, Collection 3 (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, calcareous sandstone

• 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.
• Layers of pebbly calcareous sandstone, 3-5 cm thick

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 40150: authorized by David Bottjer, entered by Matthew Clapham on 18.06.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Pholadida - Vacunellidae
? Vacunella sp. Waterhouse 1965 clam
Strophomenata
 Productida - Monticuliferidae
"Cancrinelloides monticulus" = Bandoproductus monticulus
"Cancrinelloides monticulus" = Bandoproductus monticulus Waterhouse 1982
115 ventral valves, 39 dorsal, 12 articulated
 Productida - Rugosochonetidae
Komukia solita Waterhouse 1982
3 ventral valves, 1 dorsal
 Orthotetida - Schuchertellidae
Arctitreta percostata n. sp. Waterhouse 1982
11 ventral valves, 7 dorsal
Rhynchonellata
 Terebratulida - Dielasmatidae
Elasmata retusus n. gen. n. sp.
Elasmata retusus n. gen. n. sp. Waterhouse 1982
7 ventral valves, 4 dorsal, 6 articulated
 Spiriferinida - Paraspiriferinidae
"Arionthia sapa n. sp." = Lamniplica sapa
"Arionthia sapa n. sp." = Lamniplica sapa Waterhouse 1982
8 ventral valves, 6 dorsal, 3 articulated
 Spiriferida - Trigonotretidae
Sulciplica thailandica Hamada 1960
260 ventral valves, 51 dorsal, 8 articulated
 Spiriferida - Elythidae
"Kitakamithyris buravasi" = Spirelytha buravasi
"Kitakamithyris buravasi" = Spirelytha buravasi Hamada 1960
3 ventral valves, 1 dorsal
 Rhynchonellida - Rhynchoporidae
Rhynchopora culta Waterhouse 1982
23 ventral valves, 19 dorsal, 2 articulated
Anthozoa
 Stauriida - Hapsiphyllidae
Euryphyllum sp. Hill 1937 horn coral