Alternating siltstone (upper) facies (of Bao and Jago), Birch Inlet fauna (Cambrian to of Australia)

Where: Tasmania, Australia (43.3° S, 145.1° E: paleocoordinates 43.3° S, 145.1° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Payntonian to Payntonian (494.0 - 485.0 Ma)

• STRATIGRAPHIC RELATIONS: Unnamed stratigraphic unit of Upper Carboniferous age. The Cambrian succession in this area occurs in a narrow fault slice with the base faulted against Precambrian slate and quartzite. The fossiliferous sequence is disconformably overlain by unfossiliferous sandstone and conglomerate, which is in turn overlain by the Ordovician Gordon Group (Jago and Brown 1989). AGE: late Late Cambrian (Payntonian-earliest Datsonian) on the north Australian biostratigraphic scale. STRATIGRAPHIC POSITION: Collection from the lower part of the "alternating yellow-green and purple siltstone" facies, about 70 m in thickness in total, near the middle of the section, immediately above the lower part of the same facies unit (PBDB 62277), above the "grey and green siltstone" facies (PBDB 62275), and below the grey micaceous siltstone (PBDB 62279). Collections are differentiated on the basis of facies on the stratigraphic column and range chart of Fig. 1 (Bao and Jago 2000) in the absence of stratigraphic heights, lithostratigraphic members or beds, or sample names. Additionally facies units are divided by the enterer into upper and lower halves to further differentiate the faunal succession.

• group of beds-level stratigraphic resolution

Environment/lithology: basinal (); lithified, green, yellow siltstone

• ENVIRONMENT: Authors refer to the collection as a basinal assemblage, similar to the basinal assemblage of the Hedinapsis Local Range Zone of Taylor (1976) from Nevada. Therefore assigned to a siliciclastic - basinal environment.
• SPECIFIC LITHOLOGY: Alternation of yellow-green and purple siltstone. LITHIFICATION: Lithified, assumed on the basis of age and figured specimens.

Size class: macrofossils

Preservation: cast, mold/impression

Collection methods: peel or thin section,

• COLLECTORS: Presumably the authors J.-S. Bao and J.B. Jago. REPOSITORY: Specimens are registered in either the collection of the University of Tasmania (UT) or that of the Tasmanian Mines Department (TMD), now housed in the Tasmanian Museum, Hobart.

Primary reference: J.-S. Bao and J.B. Jago. 2000. Late Late Cambrian trilobites from near Birch Inlet, south-western Tasmania. Palaeontology 43(5):881-917 [A. Miller/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 62278: authorized by Austin Hendy, entered by Austin Hendy on 17.07.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• COMPLETENESS: Limited to trilobita, but presumably exhaustive for that group. NOMENCLATURE: Authortative publication, with modern nomenclature at species-level resolution.
Trilobita
 Olenida - Eulomidae
Proteuloma huochengensis Zhang 1981 trilobite
 Olenida - Olenidae
Olenus sp. Dalman 1827 trilobite
Artiopoda
 Agnostida -
Leiagnostus inletensis Bao and Jago 2000
 Agnostida - Agnostidae