Kuta Brachiopod fauna (Triassic of Papua New Guinea)

Where: Western Highland, Papua New Guinea (5.6° S, 144.1° E: paleocoordinates 36.0° S, 104.6° E)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Kuta Formation, Rhaetian (208.5 - 201.3 Ma)

• In places the limestone appears to grade laterally into calcareous breccia containing fragments of metamorphic rocks. The limestone rests on, and in places grades laterally into, a coarse, calcerous arkose, which in turn unconformably overlies the Kubor Granodiorite of the Omung Metamorphics. The formation is overlain by either the Late Jurassic Maril Shale or the Early Crestaceous Kondake Tuff.

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; limestone

• shallow water near fringing reefs
• The Kuta Formation consists of a suite of marine arkose, limestone, and shale outcropping in the central highlands of Papua New Guinea. The formation is 30 to 250 m thick and mainly consists of hard, buff to dark grey massive, cyrstalline, coarse to fine-grained limestone.

Size class: macrofossils

Collection methods: In the present study the author have had access to the collection reported on by Rickwood (1955) and subsequent material collected by Bain et al. (1970) and by Brown and Skwarko in 1972. Much of Rickwood material was calcined so that the specimens could be extracted with greater ease. Nevertheless it has still proved suitable for sectioning, and by further breaking up some of the blocks more genera have been obtained.

•The Rickwood specimens are unnumbered, but some of them are in the original labelled boxes so that it is possible to refer to the individuals he used. The following notes are based on these specimens, supplemented where possible by others from the same collection and from the more recent collections.

Primary reference: S. K. Skwarko, R. S. Nicoll, and K. S. W. Campbell. 1976. The Late Triassic molluscs, conodonts, and brachiopods of the kuta Formation, Papua New Guinea. Journal of Austrialian Geology and Geophysics 1:219-230 [D. Bottjer/N. Bonuso/N. Bonuso]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 42523: authorized by David Bottjer, entered by Nicole Bonuso on 31.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Rhynchonellata
 Spiriferinida - Sinucostidae
Sinucosta sp. Dagys 1963
 Spiriferinida - Rastelligeridae
 Spiriferinida - Spondylospiridae
Zugmayerella sp. Dagys 1963
 Rhynchonellida - Tetrarhynchiidae
Costirhynchia sp. Buckman 1917
 Rhynchonellida - Allorhynchidae
? Hagabirhynchia sp. Jefferies 1961
 Rhynchonellida - Wellerellidae
 Athyridida - Diplospirellidae
 Terebratulida - Zeilleriidae
Zeilleria sp. Bayle 1878
 Terebratulida - Dielasmatidae
"Dielasma" cf. elongatum von Schlotheim 1816