Aegiria-Alveolitid Community, Yarwood Siltstone, Yass Syncline: Ludfordian, Australia

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Anthozoa - Heliolitida - Heliolitidae
Heliolites sp. Dana 1846
Anthozoa - Favositida - Favositidae
Favosites sp. Lamarck 1816
Anthozoa - Favositida - Alveolitidae
Kitakamiia sp. Sugiyama 1940
Anthozoa - Stauriida - Arachnophyllidae
Idiophyllum patulum
Anthozoa - Stauriida - Mucophyllidae
Mucophyllum sp. Etheridge 1894
Anthozoa - Stauriida - Lykophyllidae
Phaulactis shearsbyi
Anthozoa - Cystiphyllida - Tryplasmatidae
Tryplasma ? derrengullense
Anthozoa
Zenophilia walli
unclassified
Bryozoa indet. Ehrenberg 1831
Stenolaemata - Cryptostomata - Fenestellidae
Fenestella cf. yassensis
Tentaculitida
Tentaculitida indet. Ljaschenko 1955
Craniata - Craniopsida - Craniopsidae
Craniops sp. Hall 1859
Rhynchonellata - Athyridida - Nucleospiridae
Nucleospira sp. Hall 1859
Rhynchonellata - Athyridida - Anoplothecidae
? Coelospira sp. Hall 1863
"Coelospira &/or Atrypina"
Rhynchonellata - Pentamerida - Clorindidae
Barrandina cf. wilkinsoni
Rhynchonellata - Spiriferida - Reticulariidae
cf. Vadum sp.
spiriferid cf. Vadum
Spirinella ? caecistriata Johnston 1941
Rhynchonellata - Spiriferida - Delthyrididae
? Howellella sp. Kozlowski 1946
Rhynchonellata - Spiriferida - Cyrtiidae
Striispirifer sp. Cooper and Muir-Wood 1951
genus name in quotes
Hedeina bowningensis
Rhynchonellata - Orthida
Orthida indet. Schuchert and Cooper 1932
Salopinid? n. gen.
Rhynchonellata - Orthida - Hesperorthidae
Dolerorthis sp. Schuchert and Cooper 1931
Rhynchonellata - Orthida - Draboviidae
Salopina cf. mediocostata
Rhynchonellata - Orthida - Dalmanellidae
? Isorthis (? Protocortezorthis) sp. Walmsley and Boucot 1975
Rhynchonellata - Orthida - Dicoelosiidae
Dicoelosia sp. King 1850
[entered as Dicoleosia sp.]
Rhynchonellata - Protorthida - Skenidiidae
Skenidioides sp. Schuchert and Cooper 1931
Rhynchonellata - Atrypida - Septatrypidae
Atrypoidea sp. Mitchell and Dun 1920
Rhynchonellata - Atrypida - Atrypinidae
Spirigerina marginalis (Dalman 1828)
? Atrypina sp. Hall and Clarke 1893
"Coelospira &/or Atrypina"
? Gracianella sp. Johnson and Boucot 1967
Rhynchonellata - Atrypida - Lissatrypidae
? Lissatrypa sp. Twenhofel 1914
Rhynchonellata - Atrypida - Punctatrypidae
Reticulatrypa ? pulchra
Strophomenata - Orthotetida - Chilidiopsidae
Morinorhynchus oepiki
Strophomenata - Strophomenida - Aegiromenidae
Aegiria minuta (Mitchell 1923)
Strophomenata - Strophomenida - Strophodontidae
Pholidostrophia (Mesopholidostrophia) bendeninensis
Strophomenata - Strophomenida - Strophochonetidae
? Strophochonetes sp. Muir-Wood 1962
Strophomenata - Strophomenida - Chonetidae
Chonetidae indet. Bronn 1862
Strophomenata - Strophomenida - Amphistrophiidae
Maoristrophia sp. Allan 1947
Strophomenata - Strophomenida - Rafinesquinidae
Leptaena sp. Dalman 1828
Strophomenata - Strophomenida - Leptostrophiidae
? Leptostrophia (Mitchellella) quadrata
Cephalopoda
Nautiloidea indet. Agassiz 1847
Gastropoda
Gastropoda indet. Cuvier 1795
Bivalvia
Pelecypoda indet. Goldfuss 1820
Ostracoda - Platycopida
Platycopida indet. Sars 1866
Ostracoda - Podocopida
Podocopida indet. Sars 1866
Ostracoda
Beyrichiacea indet. Matthew 1886
Trilobita - Phacopida - Cheiruridae
Sphaerexochus ? lorum
Crotalocephalus silverdalensis Etheridge and Mitchell 1917
Trilobita - Phacopida - Encrinuridae
Staurocephalus mitchelli
Batocara bowningi
Pacificurus sp.
Trilobita - Phacopida - Calymenidae
Apocalymene sp. Chatterton and Campbell 1980
Sthenarocalymene australis
Trilobita - Odontopleurida - Odontopleuridae
Dudleyaspis bowningensis
Trilobita - Corynexochida - Styginidae
Australoscutellum longospinifex
Kosovopeltis jenkinsi
Trilobita - Proetida - Scharyiidae
Scharyia ritchiei
Trilobita - Proetida - Proetidae
Prantlia yassensis (Etheridge and Mitchell 1892)
Trilobita - Proetida - Tropidocoryphidae
Decoroproetus australis
Trilobita - Proetida - Otarionidae
Otarion horani (Etheridge and Mitchell 1893)
Trilobita - Harpetida - Harpetidae
Scotoharpes trinucleoides (Etheridge and Mitchell 1917)
Crinoidea
Crinoidea indet. Miller 1821
unclassified
Hollinanacea indet.
Pterobranchia - Dendroidea
Dendroidea indet. Nicholson 1872
Conodonta
Conodonta indet. Pander 1856
see common names

Geography
Country:Australia State/province:New South Wales
Coordinates: 35.0° South, 149.0° East (view map)
Paleocoordinates:0.1° South, 175.8° East
Basis of coordinate:based on political unit
Geographic resolution:basin
Time
Period: Silurian Epoch: Ludlow
Stage: Ludfordian 10 m.y. bin: Silurian 2
*International age/stage:Early/Lower Ludfordian
Key time interval: Ludfordian
Age range of interval: 425.6 - 423 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Black Bog Member:Yarwood Siltstone
Stratigraphic resolution:member
Lithology and environment
Primary lithology: calcareous siltstone
Secondary lithology: calcareous sandstone
Includes fossils?Y
Includes fossils?Y
Lithology description: "siltstone...fauna is most abundant in lenses of decalcified fine sandstone and siltstone which show evidence of being current-winnowed, althought not strongly."
Environment:marine indet.
Geology comments: "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."
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Collection method comments: 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.
Metadata
Database number:25634
Authorizer:M. Foote Enterer:M. Foote
Modifier:M. Uhen Research group:marine invertebrate
Created:2002-09-19 12:05:40 Last modified:2017-05-07 15:19:47
Access level:the public Released:2002-09-19 12:05:40
Creative Commons license:CC BY
Reference information

Primary reference:
7152. 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]