Aegiria-Alveolitid Community, Yarwood Siltstone, Yass Syncline (Silurian of Australia)

Where: New South Wales, Australia (35.0° S, 149.0° E: paleocoordinates 0.1° S, 175.8° E)

• coordinate based on political unit

• basin-level geographic resolution

When: Yarwood Siltstone Member (Black Bog Formation), Ludfordian (425.6 - 423.0 Ma)

• member-level stratigraphic resolution

Environment/lithology: marine; calcareous siltstone and calcareous sandstone

• "Underlain by coralline Hume Limestone...Most of the Black Bog formation beneath Yarwood siltstone consists of structureless dark-gray siltstones and mudstones. [Increase in silt content from Hume to Black Bog.]...Lack of sedimentary structures...Boundary with Yarwood gradational..Change to a strongly bioturbated calcareous siltstone with a significant shelly fauna supports [inferred, gradual shallowing]....Many shells disarticulated...Assignment to moderate-energy BA 4 seems appropriate, perhaps toward the shallow end...open water below wave base but subject to storm activity."
• "siltstone...fauna is most abundant in lenses of decalcified fine sandstone and siltstone which show evidence of being current-winnowed, althought not strongly."

Size class: macrofossils

Collection methods: Abundances of trilobites and brachiopods for four localities given in table 14.1 These taxa, plus others mentioned in text, are included in faunal list.

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 25634: authorized by Michael Foote, entered by Michael Foote on 19.09.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Trilobita
 Corynexochida - Styginidae
 Odontopleurida - Odontopleuridae
 Aulacopleurida - Aulacopleuridae
Otarion horani Etheridge and Mitchell 1893 trilobite
 Aulacopleurida - Brachymetopidae
 Phacopida - Encrinuridae
"Batocara bowningi" = Batocara, "Pacificurus sp." = Batocara, Staurocephalus mitchelli
"Batocara bowningi" = Batocara trilobite
"Pacificurus sp." = Batocara Strusz 1980 trilobite
 Phacopida - Cheiruridae
 Phacopida - Calymenidae
Apocalymene sp. Chatterton and Campbell 1980 trilobite
 Harpida - Harpetidae
Scotoharpes trinucleoides Etheridge and Mitchell 1917 trilobite
 Proetida - Proetidae
Ostracoda
 Beyrichiacea -
Beyrichiacea indet. Matthew 1886 ostracod
 Podocopa -
Podocopida indet. Sars 1866 ostracod
Platycopida indet. Sars 1866 ostracod
 Lophophorata -
Tentaculitida indet. Ljaschenko 1955
Strophomenata
 Productida - Strophochonetidae
? Strophochonetes sp. Muir-Wood 1962
 Productida - Chonetidae
Chonetidae indet. Bronn 1862
 Orthotetida - Chilidiopsidae
 Strophomenida - Aegiromenidae
"Aegiria minuta" = Epelidoaegiria minuta
"Aegiria minuta" = Epelidoaegiria minuta Mitchell 1923
 Strophomenida - Leptostrophiidae
 Strophomenida - Rafinesquinidae
Leptaena sp. Dalman 1828
 Strophomenida - Strophodontidae
 Strophomenida - Amphistrophiidae
Maoristrophia sp. Allan 1947
Rhynchonellata
 Athyridida - Nucleospiridae
Nucleospira sp. Hall 1859
 Athyridida - Anoplothecidae
? Coelospira sp. Hall 1863
"Coelospira &/or Atrypina"
 Spiriferida - Cyrtiidae
Striispirifer sp. Cooper and Muir-Wood 1951
genus name in quotes
 Spiriferida - Delthyrididae
? Howellella sp. Kozlowski 1946
 Spiriferida - Reticulariidae
cf. Vadum sp.
spiriferid cf. Vadum
 Pentamerida - Clorindidae
 Protorthida - Skenidiidae
Skenidioides sp. Schuchert and Cooper 1931
 Atrypida - Atrypinidae
? Atrypina sp. Hall and Clarke 1893
"Coelospira &/or Atrypina"
? Gracianella sp. Johnson and Boucot 1967
 Atrypida - Lissatrypidae
Atrypoidea sp. Mitchell and Dun 1920
? Lissatrypa sp. Twenhofel 1914
 Atrypida - Punctatrypidae
 Orthida -
Orthida indet. Schuchert and Cooper 1932
Salopinid? n. gen.
 Orthida - Draboviidae
 Orthida - Dicoelosiidae
Dicoelosia sp. King 1850
[entered as Dicoleosia sp.]
 Orthida - Dalmanellidae
? Isorthis (? Protocortezorthis) sp. Walmsley and Boucot 1975
 Orthida - Hesperorthidae
Dolerorthis sp. Schuchert and Cooper 1931
Craniata
 Craniopsida - Craniopsidae
Craniops sp. Hall 1859
Bivalvia
  -
"Pelecypoda indet." = Bivalvia
"Pelecypoda indet." = Bivalvia Linnaeus 1758 clam
Gastropoda
  -
Gastropoda indet. Cuvier 1797 snail
Cephalopoda
 Nautiloidea -
Nautiloidea indet. Agassiz 1847 nautiloid
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831
Stenolaemata
 Fenestrida - Fenestellidae
Conodonta
  -
Conodonta indet. Eichenberg 1930 conodont
Graptolithina
 Dendroidea -
Dendroidea indet. Nicholson 1872 graptolite
Crinoidea
  -
Crinoidea indet. Miller 1821 Sea lily
Anthozoa
 Favositida - Favositidae
Favosites sp. Lamarck 1816 tabulate coral
 Favositida - Alveolitidae
Kitakamiia sp. Sugiyama 1940 tabulate coral
 Heliolitida - Heliolitidae
Heliolites sp. Dana 1846 tabulate coral
 Cystiphyllida - Tryplasmatidae
 Stauriida - Mucophyllidae
Mucophyllum sp. Etheridge 1894 horn coral
 Stauriida - Lykophyllidae
 Stauriida - Arachnophyllidae
 Rugosa -
Zenophilia walli horn coral