Fauna j, Section AV5, Delorme Fm., Mackenzie Mts.: Whitwellian, Canada

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Trilobita - Phacopida - Encrinuridae
Struszia (Avalanchurus) lennoni n. sp.
Edgecombe and Chatterton 1993
Trilobita - Phacopida - Calymenidae
Diacalymene gabrielsi Siveter and Chatterton 1996
Calymene polgari Siveter and Chatterton 1996
C. (s.l.)
Trilobita - Proetida - Otarionidae
Otarion huddyi n. sp. Adrain and Chatterton 1994
Adrain and Chatterton 1994
Strophomenata - Strophomenida - Strophodontidae
Brachyprion (Protomegastrophia) sp. Caster 1939
Jin and Chatterton 1997
reassigned as Megastrophia (Protomegastrophia)
Strophomenata - Strophomenida - Sowerbyellidae
Eoplectodonta (Eoplectodonta) paucicostellata Jin and Chatterton 1997
Jin and Chatterton 1997
Strophomenata - Strophomenida - Furcitellidae
Pentlandina harperi Zhang 1989
Jin and Chatterton 1997
Strophomenata - Orthotetida - Chilidiopsidae
Morinorhynchus crispus (Lindström 1861)
Jin and Chatterton 1997
Strophomena crispa
Rhynchonellata - Protorthida - Skenidiidae
Skenidioides operosa Johnson et al. 1976
Jin and Chatterton 1997
Rhynchonellata - Rhynchonellida - Trigonirhynchiidae
Hercotrema pentaforma (Lenz 1977)
Jin and Chatterton 1997
Ancillotoechia pentaforma
Rhynchonellata - Orthida - Dicoelosiidae
Epitomyonia amplissima Zhang 1989
Jin and Chatterton 1997
Rhynchonellata - Orthida - Dalmanellidae
Isorthis (Arcualla) boreaina Zhang 1989
Jin and Chatterton 1997
Isorthis (Arcualla) microscapha Johnson et al. 1976
Jin and Chatterton 1997
Rhynchonellata - Atrypida - Atrypidae
Atrypa (Gotatrypa) variabilis Johnson et al. 1976
Jin and Chatterton 1997
see common names

Geography
Country:Canada State/province:Northwest Territories
Coordinates: 62.4° North, 127.0° West (view map)
Paleocoordinates:4.7° North, 49.3° West
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period:Silurian Epoch:Wenlock
Stage:Homerian 10 m.y. bin:Silurian 2
*Epoch:Early/Lower Wenlock
Key time interval:Whitwellian Zone: Kockelella patula
Age range of interval:426.20000 - 425.40000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Delorme
Stratigraphic resolution:group of beds
Stratigraphy comments: Zonation based on conodonts present in AV sections 1, 2, and 4. (AV 3 and DR sections correlated with these on basis of trilobite faunal assemblages. I'm assuming AV5 can be correlated as well.) See PBDB ref. 7215.
Lithology and environment
Primary lithology: argillaceous "limestone"
Secondary lithology: "shale"
Lithology description: "...sequence of buff and light brown weathering, thinly bedded limestones, dolomites and shales that overlie the Whittaker Formation and underlie the Camsell Formation...The beds above and including a distinctive buff-brown shale unit in the sections near Avalanche Lake are included in the Delorme Formation in this work, although the lowest buff-brown shaly beds (below distinctive orange coloured limestones and dolomites) could be regarded as transitional between the Road River and Delorme..." (PBDB ref. 7215)
Environment:slope Tectonic setting:passive margin
Glacial or sequence phase:highstand systems tract
Geology comments: Grand Cycle 3.
SEP environmental call based primarily on PBDB ref. 7215.
Taphonomy
Modes of preservation:replaced with silica
Collection methods and comments
Collection excludes:some macrofossils
Reason for describing collection:taxonomic analysis
Metadata
Database number:26058
Authorizer:M. Foote Enterer:M. Foote
Modifier:P. Wagner Research group:marine invertebrate
Created:2002-10-01 13:51:29 Last modified:2007-04-10 16:40:00
Access level:the public Released:2002-10-01 13:51:29
Creative Commons license:CC BY
Reference information

Primary reference:

7217. D. J. Siveter and B. D. E. Chatterton. 1996. Silicified calymenid trilobites from the Mackenzie Mountains, northwest Canada. Palaeontographica Abteilung A 239(1-3):43-60 [M. Foote/M. Foote/M. Foote]

Secondary references:

7226 J. M. Adrain and B. D. E. Chatterton. 1994. The aulacopleurid trilobite Otarion, with new species from the Silurian of northwestern Canada. Journal of Paleontology 68(2):305-323 [M. Foote/M. Foote/M. Foote]
7220 G. D. Edgecombe and B. D. E. Chatterton. 1993. Silurian (Wenlock-Ludlow) encrinurine trilobites from the Mackenzie Mountains, Canada, and related species. Palaeontographica Abteilung A 229(4-6):75-112 [M. Foote/M. Foote/M. Foote]
7218 J. Jin and B. D. E. Chatterton. 1997. Latest Ordovician-Silurian articulate brachiopods and biostratigraphy of the Avalanche Lake area, southwestern District of Mackenzie, Canada. Palaeontographica Canadiana 13:1-62 [M. Foote/M. Foote/M. Foote]