Atrypina (Atrypinopsis)-Lissidium Community, uppermost Whittaker Formation, NWT: Wenlock - Ludlow, Canada

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Rhynchonellata - Spiriferida - Delthyrididae
Howellella cf. arctica
Rhynchonellata - Spiriferida - Cyrtiidae
? Striispirifer sp. Cooper and Muir-Wood 1951
Rhynchonellata - Orthida - Dicoelosiidae
Epitomyonia triseptata Lenz 1977
Epitomyonia cf. clausula Johnson et al. 1976
Rhynchonellata - Orthida - Rhipidomellidae
Dalejina sp. Havlicek 1953
Rhynchonellata - Orthida - Dalmanellidae
? Isorthis sp. Kozlowski 1929
Rhynchonellata - Orthida - Hesperorthidae
Dolerorthis sp. Schuchert and Cooper 1931
sp. 1; genus name in quotes
Rhynchonellata - Pentamerida
Pentamerida indet. Schuchert and Cooper 1931
rugate subrianinid
Rhynchonellata - Pentamerida - Pentameridae
Harpidium (Lissocoelina) sp. Kirk 1925
Rhynchonellata - Pentamerida - Subrianidae
Lissidium erugata
Rhynchonellata - Atrypida - Glassiidae
Glassia sp. Davidson 1881
sp. 2
Rhynchonellata - Atrypida - Punctatrypidae
? Reticulatrypa sp.
sp. 1
Rhynchonellata - Atrypida - Lissatrypidae
Lissatrypidae indet. Twenhofel 1914
Rhynchonellata - Atrypida - Atrypidae
Spinatrypa sp. Stainbrook 1951
Rhynchonellata - Atrypida - Atrypinidae
Gracianella lissumbra Johnson and Boucot 1967
Atrypina (Atrypinopsis) sp. ()
? Nalivkinia sp.
Rhynchonellata - Athyridida - Meristellidae
Whitfieldella sp. Hall and Clarke 1893
Rhynchonellata - Rhynchonellida - Rhynchotrematidae
Stegerhynchus sp. (Foerste 1909)
original and current combination Rhynchonella (Stegerhynchus)
see common names

Geography
Country:Canada State/province:Northwest Territories
Coordinates: 63.8° North, 125.3° West (view map)
Paleocoordinates:5.3° North, 48.4° West
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period:Silurian
10 m.y. bin:Silurian 2
*Epoch:Late/Upper Wenlock - Early/Lower Ludlow
Key time interval:Wenlock - Ludlow
Age range of interval:433.40000 - 423.00000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Whittaker
Stratigraphic resolution:member
Stratigraphy comments: Uppermost beds (169-197 m of section), Late Wenlock and/or early Ludlow
Lithology and environment
Primary lithology: dolomite
Includes fossils?Y
Lithology description: Lenz (1989) (PBDB ref. 6992): "very fossiliferous, thick, poorly bedded dolostones...all brachiopods silicified..."
Environment:deep subtidal shelf Tectonic setting:passive margin
Geology comments: "The deeper end of BA 3 seems reasonable, particularly in view of the presence of Epitomyonia. The rubbly nature of the rock suggests moderate agitation with some shell destruction and with some sorting and winnowing...Community is highest in a continuous sequence comprising, from oldest to youngest, Reveroides-Harpidium, Glassia-Harpidium, and [this Comm.]...sequence interpreted as progressive deepening." Lenz (1989--PBDB ref. 6992 interprets sequence as carbonate platform margin.
SEP environmental call based on given information
Taphonomy
Modes of preservation:replaced with silica
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Collection method comments: Relative abundances (abundant, common, few, rare, very rare) given in table 46.1. Three collections at 169 m, 184 m, and 197 m are combined.
Metadata
Database number:24918
Authorizer:M. Foote Enterer:M. Foote
Modifier:M. Foote Research group:marine invertebrate
Created:2002-08-22 15:20:57 Last modified:2006-09-15 15:14:05
Access level:the public Released:2002-08-22 15:20:57
Creative Commons license:CC BY
Reference information

Primary reference:
6991. A. C. Lenz. 1999. Wenlockian to Pragian brachiopod communities of the northern Canadian Cordillera. In A. J. Boucot and J. D. Lawson (eds.), Paleocommunities--a case study from the Silurian and Lower Devonian 784-792 [M. Foote/M. Foote/M. Foote]