'Striispirifer'-Spirinella Community, Yarralumla Fm., Canberra loc. CC16 (Silurian of Australia)

Also known as Fauna transitional between 'Striispirifer'-Spirinella and Halysitid Communities, Yarralumla

Where: Australian Capital Territory, Australia (35.3° S, 149.1° E: paleocoordinates 2.0° N, 175.8° E)

• coordinate based on political unit

• local area-level geographic resolution

When: Yarralumla Formation, Gorstian (427.4 - 425.6 Ma)

• Age of community given as Late Wenlockian? to Early Ludlovian. Correlation chart gives lowermost Gorstian for Cliftonwood Limestone (PBDB coll. 25680), with which this formation is said to be coeval.

• formation-level stratigraphic resolution

Environment/lithology: marine; volcaniclastic, silty, calcareous mudstone

• "As interpreted by Link (1971), the clastic sediments of the Cliftonwood Lst were deposited in a quiet transgression and were high subtidal to locally intertidal. The lower, sandier part of his Yass Subgroup has common ripple marked and occasional raindrop? marked bedding surfaces...Mud cracks filled with fine sand are not uncommon in the lower beds. Fossils are usually scattered...brachiopods commonly articulated...some evidence of bioturbation. The overall aspect of the fauna suggests assignment to BA 3. In the Canberra area, wehre the Yarralumla Form. is muddier and more obviously volcanogenic and local relief was probably greater, some occurrences may be deeper, but this has yet to be established....The is some evidence for lateral transition to the Halysitid community in the Canberra area, in both the Canberra Formation and the Yarralumla Formation. Thus, at locality CC16, the Yarralumla Formation is more calcareous than usual, approaching the silty calcarenites typical of the Halysitid Community..."
• See geology.

Size class: macrofossils

Collection methods: Taxa listed in table 14.10, with abundances. Yarralumla Formation only.

Primary reference: D. L. Strusz and M. J. Garratt. 1999. Australian communities. In A. J. Boucot, J. D. Lawson (eds.), Paleocommunities - a case study from the Silurian and Lower Devonian 177-199 [M. Foote/M. Foote/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 25683: authorized by Michael Foote, entered by Michael Foote on 20.09.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Anthozoa
 Favositida - Favositidae
Favosites spp.
Favosites spp. Lamarck 1816 tabulate coral
 Favositida - Pachyporidae
? Cladopora sp.
? Cladopora sp. Hall 1851 tabulate coral
 Auloporida - Syringoporidae
Syringopora sp.
Syringopora sp. Goldfuss 1826 tabulate coral
 Heliolitida - Halysitidae
Halysitidae indet.
Halysitidae indet. Milne-Edwards and Haime 1849 tabulate coral
 Heliolitida - Heliolitidae
Heliolites sp.
Heliolites sp. Dana 1846 tabulate coral
 Rugosa -
Rugosa indet.
Rugosa indet. horn coral
 Cystiphyllida - Tryplasmatidae
? Tryplasma sp.
? Tryplasma sp. Lonsdale 1845 horn coral
 Stauriida - Lykophyllidae
Phaulactis shearsbyi
 Stauriida - Entelophyllidae
Entelophyllum ? latum
Demospongiae
 Chaetetida - Tiverinidae
? Barrandeolites spp.
? Barrandeolites spp. Sokolov and Prantl 1965 chaetetid sponge
Stromatoporoidea
 Stromatoporoidea -
Stromatoporoidea indet.
Stromatoporoidea indet. stromatoporoid sponge
Bryozoa
  -
Bryozoa indet.
Bryozoa indet. Ehrenberg 1831
Brachiopoda
  -
Brachiopoda indet.
Brachiopoda indet. Cuvier 1805
Rhynchonellata
 Spiriferida - Delthyrididae
Howellella nucula
Howellella nucula
"Howellella nucula (& 'Striispirifer'?)"
 Spiriferida - Reticulariidae
Spirinella caecistriata
 Spiriferida - Cyrtiidae
? Striispirifer sp.
? Striispirifer sp. Cooper and Muir-Wood 1951
 Athyridida - Retziellidae
Retziella capricornae
 Atrypida - Septatrypidae
Atrypoidea australis
 Atrypida - Atrypidae
Atrypa cf. dzwinogrodensis
 Orthida - Draboviidae
Salopina ? mediocostata
Strophomenata
 Strophomenida - Strophochonetidae
Protochonetes cf. minimus
 Strophomenida - Aegiromenidae
"Aegiria (Epelidoaegiria) ? chilidifera" = Epelidoaegiria minuta chilidifera
"Aegiria (Epelidoaegiria) ? chilidifera" = Epelidoaegiria minuta chilidifera Strusz 1982
 Strophomenida - Leptostrophiidae
Leptostrophia (Mitchellella) quadrata
Polychaeta
 Cuniculepadida - Turrilepadidae
Turrilepas sp.
Turrilepas sp. Woodward 1865 scale worm
Gastropoda
  -
Gastropoda indet.
Gastropoda indet. Cuvier 1795 snail
Trilobita
  -
Trilobita indet.
Trilobita indet. Walch 1771 trilobite
 Corynexochida - Styginidae
Scutelluidae indet.
Scutelluidae indet. Richter and Richter 1955 trilobite
 Phacopida - Encrinuridae
"Pacificurus sp." = Batocara
"Pacificurus sp." = Batocara Strusz 1980 trilobite