USNM9266, Block 1, Khao Mang Lat Hill, Ban Kao (Permian of Thailand)

Where: Kanchanaburi, Thailand (14.0° N, 99.4° E: paleocoordinates 31.3° S, 99.8° E)

• coordinate based on nearby landmark

• small collection-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: shallow subtidal; shelly/skeletal, silty, sandy limestone

• Depositional setting reconstructed as fairly shallow water, near shore and a source of terrigenous sediment, with a fairly firm substrate, in somewhat turbid water.
• Sandy silty limestone, with the maximum size of the sand in the medium range. Sand makes up about 10% of the rock and silt about 15%; the cement is calcite.

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 40855: authorized by David Bottjer, entered by Matthew Clapham on 01.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Concentrates on brachiopods, accompanying faunas are mentioned but likely not fully described
Strophomenata
 Productida - Productellidae
"Marginifera arenaria" = Marginifera (Arenaria) arenaria
"Marginifera arenaria" = Marginifera (Arenaria) arenaria Grant 1976
 Orthotetida - Schuchertellidae
 Orthotetida - Derbyiidae
Derbyia sp. Waagen 1884
 Orthotetida - Meekellidae
Meekella bisculpta Grant 1976
Rhynchonellata
 Athyridida - Athyrididae
"Composita subsolana" = Posicomta subsolana
"Composita subsolana" = Posicomta subsolana Grant 1976
 Terebratulida - Dielasmatidae
Dielasmatinae indet. Schuchert 1913
Dielasmina or Fletcherithyris sp.
 Spiriferinida - Spiriferellinidae
 Spiriferida - Spiriferellidae
Spiriferella sp. Tschernyschew 1902