Aegiria-Alveolitid Comm., Black Bog Fm. below Yarwood Siltstone, Yass Syncline: Ludfordian, Australia

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Strophomenata - Strophomenida - Stropheodontidae
Strophomenata - Orthotetida - Chilidiopsidae
Rhynchonellata - Spiriferida - Cyrtiidae
Rhynchonellata - Spiriferida - Reticulariidae
Spirinella sp. Johnston 1941
Rhynchonellata - Atrypida - Septatrypidae
Atrypoidea sp. Mitchell and Dun 1920
Trilobita - Corynexochida - Styginidae
Trilobita - Phacopida - Cheiruridae
Trilobita - Phacopida - Encrinuridae
Pacificurus mitchelli (Foerste 1888)
Anthozoa - Favositida - Alveolitidae
Kitakamiia sp. Sugiyama 1940
see common names

Geography
Country:Australia State/province:New South Wales
Coordinates: 35.0° South, 149.0° East (view map)
Paleocoordinates:14.2° South, 123.9° East (Wright 2013)
Basis of coordinate:based on political unit
Geographic resolution:local area
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 - 422.7 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Black Bog
Stratigraphic resolution:member
Stratigraphy comments: Parts of formation below the Yarwood siltstone.
Lithology and environment
Primary lithology:gray,green siltstone
Includes fossils?Y
Lithology description: "outcrops of sparsely fossiliferous gray-green siltstone.."
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
Metadata
Database number:25635
Authorizer:M. Foote Enterer:M. Foote
Modifier:M. Uhen Research group:marine invertebrate
Created:2002-09-19 12:11:51 Last modified:2025-02-22 15:12:02
Access level:the public Released:2002-09-19 12:11:51
Creative Commons license:CC0
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]