Section AV4, 126mT, Avalanche Lake (Silurian of Canada)

Where: Northwest Territories, Canada (62.4° N, 127.1° W: paleocoordinates 6.9° N, 51.6° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Delorme Formation, Sheinwoodian (433.4 - 430.5 Ma)

• talus sample from 126 m above base of the section

• bed-level stratigraphic resolution

Environment/lithology: offshore; lithified lime mudstone and lithified wackestone

• Benthic Assemblage 5
• thin-bedded lime mudstones to wackestone

Size class: macrofossils

Primary reference: J. K. Rigby and B. D. E. Chatterton. 1999. Silurian (Wenlock) demosponges from the Avalanche Lake area of the Mackenzie Mountains, southwestern District of Mackenzie, Northwest Territories, Canada. Palaeontographica Canadiana 16:1-43 [W. Kiessling/U. Merkel]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 121299: authorized by Wolfgang Kiessling, entered by Uta Merkel on 02.12.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Sphinctozoa
 Sphinctozoa -
Sphinctozoa indet.
cryptocoeliid(?) sphinctozoan
Demospongea
 Tetractinomorpha -
Belemnospongia epiradiatus n. sp. Rigby and Chatterton 1999 demosponge
 Streptosclerophorida - Hindiidae
Hindia sphaeroidalis Duncan 1879 demosponge
 Spirosclerophorida - Haplistiidae
? Haplistion frustrum Rigby and Chatterton 1989 demosponge
 Lithistida - Anthaspidellidae
Anthaspidellidae indet. Miller 1889 demosponge
Archaeoscyphia alternata de Freitas 1989 demosponge
Archaeoscyphia annulata Rigby 1973 demosponge
Archaeoscyphia scalaria de Freitas 1989 demosponge
Archaeoscyphia rectilinearis de Freitas 1989 demosponge
Archaeoscyphia attenuata de Freitas 1989 demosponge
Patellispongia mackenziensis Rigby and Chatterton 1999 demosponge
Patellispongia alternata Rigby and Chatterton 1989 demosponge
 Lithistida - Astylospongiidae
Carpospongia castanea Roemer 1861 demosponge
Astylospongia praemorsa Goldfuss 1826 demosponge