Baillie-Hamilton Island, Section 12, Unit 20, GSC loc. C26982: Lochkovian, Canada

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Conodonta - Ozarkodinida
Ozarkodina cf. remscheidensis Ziegler 1960
recombined as Nicollidina remscheidensis
Strophomenata - Orthotetida - Chilidiopsidae
Iridistrophia johnsoni n. sp.
Rhynchonellata - Spiriferida - Delthyrididae
Acanthospirifer norfordi n. sp.
Howellella informal sp. 1 Kozlowski 1946
Rhynchonellata - Athyridida - Meristellidae
? Meristina sp. Hall 1867
Rhynchonellata - Spiriferinida - Cyrtinidae
? Cyrtina sp. Davidson 1858
Rhynchonellata - Rhynchonellida - Hebetoechiidae
"Tadschikia" crassiforma n. sp.
Rhynchonellata - Orthida - Schizophoriidae
Schizophoria fossula n. sp.
see common names

Geography
Country:Canada State/province:Nunavut
Coordinates: 76.8° North, 94.3° West (view map)
Paleocoordinates:2.2° South, 25.0° 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
*International age/stage:Early/Lower Lochkovian
Key time interval:Lochkovian
Age range of interval:419.20000 - 410.80000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Stratigraphic resolution:bed
Stratigraphy comments: Unnamed formation about Cape Phillips Formation. "The age of this carbonate unit is early Lochkovian, corresponding to Klapper's faunas 1 and 2."
Lithology and environment
Primary lithology:gray argillaceous,silty,sandy lime mudstone
Lithology description: This part of section as a whole: "Unnamed carbonate unit (at least 500 m thick) which can be broken into three members. The lower member is coposed of thin-bedded argillaceous lime-mudstone containing common argillaceous seams and contains a varied brachiopod fauna as well as corals, gastropods and, in the upper parts, oncoloites....second member consisting of thin to med. bedded silty lime-mudstone containing common to abundant colonial corals as well as bryozoans. The third member is thin to very thin bedded, silty argillaceous lime mudstone containing in places lime mud intraclasts exhibiting sedimentary drape, channeling, as well as what appear to be small-scale ripple marks and common to abundant leperditiid ostracodes." This unit: "Argillaceous lime mudstone: thin bedded, undulatory; med. dk. grey to grey-brown,...well indurated, common yellow-grey argillaceous seams, other seams grey-green; few brachiopods, common colonial corals; slightly silty to sandy; some beds have fair amount of tiny comminuted debris..."
Environment:deep subtidal shelf 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. Smith's Gypidula-Atrypa-Schizophoria Community, which sits in zone 3 in his 6-zone onshore to offshore gradient, shallow to deep subtidal, below wave base.
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:Gypidula-Atrypa-Schizophoria Community
Database number:26538
Authorizer:M. Foote Enterer:M. Foote
Modifier:M. Foote Research group:marine invertebrate
Created:2002-10-16 14:01:44 Last modified:2006-09-15 15:13:14
Access level:the public Released:2002-10-16 14:01:44
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]