Western Prince of Wales Island, Section 7, Unit 3, GSC loc. C26852: Lochkovian, Canada

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Conodonta - Ozarkodinida
Ozarkodina remscheidensis Ziegler 1960
recombined as Nicollidina remscheidensis
Strophomenata - Strophomenida - Amphistrophiidae
Mesodouvillina musculusvarius
Rhynchonellata - Orthida - Schizophoriidae
Schizophoria fossula n. sp.
Rhynchonellata - Rhynchonellida - Trigonirhynchiidae
Ancillotoechia plicaminor n. sp.
Rhynchonellata - Athyridida - Athyrididae
Protathyris sp.
see common names

Geography
Country:Canada State/province:Nunavut
Coordinates: 73.5° North, 100.0° West (view map)
Paleocoordinates:2.2° South, 30.2° West
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period:Devonian Epoch:Early/Lower Devonian
Stage:Lochkovian 10 m.y. bin:Devonian 1
Key time interval:Lochkovian
Age range of interval:419.20000 - 410.80000 m.y. ago
Stratigraphy
Stratigraphic resolution:bed
Stratigraphy comments: Unnamed formation. "Lochkovian, but not earliest Lochkovian"
Lithology and environment
Primary lithology:shelly/skeletal,gray packstone
Secondary lithology:shelly/skeletal,gray grainstone
Lithology description: Section in general: "The characteristic lithology is very silty, thin-bedded lime mudstone containing argillacoue seams and common dark grey-black laminations." "..composed of heavily argillaceous, carbonaceous lime-mudstone with abudnant angular quartz silt and abundant fecal fellets. In additon to the brachiopod fauana, it contains gastropods, pelecypods, ostracodes and rare crinoids." For this unit: "Lime mudstone-wackestone: thin to med. bedded, fairly lenticular; med. dark grey, weathering med. lt. grey to grey-brown; well indurated, fetid fossiliferous...fossils dispersed but locally concentrated in lenses of 3-10 cm...at 8.8 m, GSC loc. C26852, small packstone-grainstone lens with tremendous amounts of rhynchonellids, lesser strophomenids and orthids;"
Environment:lagoonal/restricted shallow subtidal Tectonic setting:passive margin
Geology comments: Deposits in this region are of two general kinds: shallow-water stable carbonate platform (generally in the NW part of Arctic Archipelago) and deeper basinal facies (generally to the SE). This collection is in the former. This is in Smith's Mesodouvillina-Ancillotoechia Community, which he places in the second of six zones from nearshore to offshore, shallow subtidal. "This comm. probably occupied a somewhat restricted, shallow-water environment. The lack of such common taxa as Howellella, Atrypa, and Gypidula suggests and abnormal environment, possibly shallower and more restricted than the Schizophoria-Howellella environemnt. The high concentration of argillaceous and carbonaceous matter would have restricted the growth of large numbers of the normal marine fauans, e.e., corals, bryozoans, and echinoderm fragments."
SEP environmental call based on given info and regional context
Taphonomy
Collection methods and comments
Reason for describing collection:biostratigraphic analysis
Museum repositories:GSC
Collection method comments: Smith gives specimen counts.
Taxonomic list comments:Focus of the entire monograph is on brachiopods. Other taxa mentioned but not necessarily listed in detail.
Metadata
Also known as:Mesodouvillina-Ancillotoechia Community
Database number:26481
Authorizer:M. Foote Enterer:M. Foote
Modifier:M. Foote Research group:marine invertebrate
Created:2002-10-16 07:31:53 Last modified:2006-09-15 15:13:14
Access level:the public Released:2002-10-16 07:31:53
Creative Commons license:CC BY
Reference information

Primary reference:
7273. R. E. Smith. 1980. Lower Devonian (Lochkovian) biostratigraphy and brachiopod faunas, Canadian arctic islands. Geological Survey of Canada Bulletin 308:1-155 [M. Foote/M. Foote/P. Wagner]