USNM9268, Khao Tok Nam Hill, Rat Buri (Permian of Thailand)

Where: Ratchaburi, Thailand (13.5° N, 99.7° E: paleocoordinates 30.9° S, 100.4° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Rat Buri Formation, Roadian (272.3 - 268.8 Ma)

• The age of the Rat Buri fauna is problematic. "Rat Buri" limestones likely range in age from Kungurian through Capitanian to perhaps Wuchiapingian. Wordian fusulinids appear most common in other collections, but are not found in association with the brachiopod localities. The brachopod fauna is most similar to the Wordian Amb Formation of the Salt Range, in Pakistan, tentatively indicating a Wordian age.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, shelly/skeletal, red limestone

• Peculiar pink colour that left no terrigenous residue, but a great amount of fragmentary shelly material

Size class: macrofossils

Preservation: replaced with silica

Collection methods: bulk, chemical,

Primary reference: R. E. Grant. 1976. Permian brachiopods from southern Thailand. Paleontological Society Memoir 9:1-269 [D. Bottjer/M. Clapham/M. Clapham]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 40936: authorized by David Bottjer, entered by Matthew Clapham on 03.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Concentrates on brachiopods; other groups are mentioned briefly in text
Fusulinina
 Fusulinoidea - Ozawainellidae
Ozawainella sp. Thompson 1935
Gastropoda
 Bellerophontida -
Bellerophontida indet. Ulrich and Scofield 1897 snail
 Pleurotomariacea -
"Pleurotomariacea indet." = Pleurotomarioidea
"Pleurotomariacea indet." = Pleurotomarioidea Swainson 1840 snail
At least 5 genera
Stenolaemata
 Cystoporida - Fistuliporidae
Fistuliporidae indet. Ulrich 1882
Encrusting
Strophomenata
 Productida - Echinoconchidae
Bilotina acantha Waterhouse and Piyasin 1970
 Productida - Productellidae
Echinauris sp. Muir-Wood and Cooper 1960
Pseudoavonia kunlunensis de Terra 1932
 Productida - Rugosochonetidae
"Waagenites speciosus" = Waterhouseiella speciosa Waterhouse and Piyasin 1970
Striochonetes scutella Waterhouse and Piyasin 1970
 Orthotetida - Meekellidae
Meekella colpata Grant 1976
Rhynchonellata
 Athyridida - Neoretziidae
Hustedia ratburiensis Waterhouse and Piyasin 1970
 Athyridida - Athyrididae
Cleiothyridina seriata, "Composita dolabrata n. sp." = Posicomta dolabrata
"Composita dolabrata n. sp." = Posicomta dolabrata Grant 1976
 Spiriferinida - Paraspiriferinidae
 Spiriferida - Ambocoeliidae
Orbicoelia fraterculus Waterhouse and Piyasin 1970
 Rhynchonellida - Stenoscismatidae
Stenoscisma "sp. C" Conrad 1839
 Orthida - Schizophoriidae
"Orthotichia waterhousei n. sp." = Kotlaia waterhousei
"Orthotichia waterhousei n. sp." = Kotlaia waterhousei Grant 1976
 Orthida - Rhipidomellidae
Anthozoa
 Stauriida - Aulophyllidae
Amygdalophyllum sp. Dun and Benson 1920 horn coral
Demospongea
 Agelasida - Girtyocoeliidae
cf. Girtycoelia sp. King 1933 demosponge