Chasm Creek Formation, Upper Member 1 (Churchill River Exposure): Richmondian - Gamachian, Canada

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Strophomenata - Strophomenida - Furcitellidae
Megamyonia nitens (Billings 1860)
Rhynchonellata - Rhynchonellida - Rhynchotrematidae
Lepidocyclus perlamellosus (Whitfield 1878)
recombined as Lepidocyclus perlamellosa
Rhynchonellata - Orthida - Plaesiomyidae
Plaesiomys occidentalis (Ladd 1929)
    = Dinorthis occidentalis Okulitch 1943
Wright and Stigall 2013
Cephalopoda - Apsidoceratidae
Fremontoceras cf. loperi
Apsidoceras milleri n. sp.
Gastropoda - Murchisoniina - Trochonematidae
Trochonema coxi Wilson 1938
Anthozoa - Stauriida - Stauriidae
Favistella alveolata
Palaeophyllum stokesi
Palaeophyllum raduguini
Palaeophyllum raduguini n. nov.
Anthozoa - Stauriida - Streptelasmatidae
Bighornia bottei n. sp.
Bighornia patella (Wilson 1926)
Lobocorallium trilobatum
Lobocorallium trilobatum var. major nov.
Anthozoa - Favositida - Favositidae
Palaeofavosites capax
original and current combination Paleofavosites
Palaeofavosites okulitchi
original and current combination Paleofavosites
Anthozoa - Lichenariida - Lyoporidae
Lyopora manitobensis n. sp.
Lyopora churchillensis n. sp.
Anthozoa - Heliolitida - Halysitidae
Manipora amicarum
Manipora irregularis
Anthozoa - Sarcinulida - Syringophyllidae
Calapoecia anticostiensis Billings 1865
see common names

Geography
Country:Canada State/province:Manitoba
Coordinates: 58.1° North, 94.8° West (view map)
Paleocoordinates:6.9° South, 50.9° West
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period:Ordovician Epoch:Late/Upper Ordovician
10 m.y. bin:Ordovician 5
*Period:Late/Upper Ordovician *Local age/stage:Late/Upper Richmondian - Gamachian
Key time interval:Richmondian - Gamachian
Age range of interval:449.80000 - 443.80000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Churchill River Formation:Chasm Creek Member:1
Stratigraphic resolution:member
Stratigraphy comments: Faunal assemblage with this collection is associated with the upper 11 feet of Member No.1. In the upper 11 feet, "Palaeofavosites okulitchi . . . appears for the first time. This species is considered diagnostic for the upper Stony Mountain Formation (Gunton Member) of southern Manitoba and suggests that these upper beds of Member No. 1 and the higher strata of the formation may correlate with the Gunton."
Lithology and environment
Primary lithology:dolomitic,gray "limestone"
Includes fossils?Y
Lithology description: "At least 55 feet thick . . . consists of very resistant, light-yellowish-gray to buff, microcrystalline, iron-rich, in many places fucoidal, dolomitic to slightly dolomitic limestone, in massive beds weathering yellow and orange. Organic detritus is rather sparse and finely fragmented."
Environment:carbonate indet.
Geology comments: Environmental call by T. Hanson
Taphonomy
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:23024
Authorizer:S. Holland, P. Wagner Enterer:T. Hanson, P. Wagner
Modifier:S. Holland Research group:marine invertebrate
Created:2002-07-08 11:00:34 Last modified:2003-09-01 20:52:48
Access level:the public Released:2002-07-08 11:00:34
Creative Commons license:CC BY
Reference information

Primary reference:
6140. S. J. Nelson. 1963. Ordovician paleontology of the Northern Hudson Bay lowland. Geological Society of America Memoir 90:1-152 [S. Holland/T. Hanson/T. Hanson]

Secondary references:

64957 D. F. Wright and A. L. Stigall. 2013. Phylogenetic revision of the Late Ordovician orthid brachiopod genera Plaesiomys and Hebertella from Laurentia. Journal of Paleontology 87(6):1107-1128 [P. Wagner/P. Wagner]