Portage Chute Formation, Member 2 (Churchill River Exposure) (Ordovician to of Canada)

Where: Manitoba, Canada (58.0° N, 95.0° W)

• Paleocoordinates: 1.4° S, 108.0° W (Wright 2013)

• coordinate estimated from map

• outcrop-level geographic resolution

When: 2 Member (Portage Chute Formation), Edenian to Edenian (451.0 - 445.5 Ma)

Environment/lithology: dolomitic, gray limestone

• Environmental call by T. Hanson.
• "Gray- to buff-weathering, light-gray, microcrystalline, slightly dolomitic limestone in beds 1 inch to 2 feet thick. Fragmental organic material is common. Closely-spaced, rusty-weathering, anastamosing laminae within the limestone are characteristic and in many places give the member a nodular appearance upon weathering."

Size class: macrofossils

Primary reference: 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]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 13654: authorized by Steven Holland, entered by Tori Hanson on 16.04.2002

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Exomegoceras wyomingense
Cephalopoda
 Dissidocerida - Narthecoceratidae
Narthecoceras crassisiphonatum
 Actinocerida - Actinoceratidae
Paractinoceras canadense
 Actinocerida - Gonioceratidae
Lambeoceras landerense, Lambeoceras baffinense
Lambeoceras baffinense Miller et al. 1954
 Oncocerida - Oncoceratidae
Digenuoceras latum, Neumatoceras churchillense n. sp.
 Multiceratoidea - Apsidoceratidae
Wilsonoceras squawcreekense, Charactoceras manitobense n. sp.
 Ascocerida - Ascoceratidae
Billingsites costulatus, Billingsites landerensis
 Discosorida - Westonoceratidae
Westonoceras nelsonense, Winnipegoceras laticurvatum
 Discosorida - Cyrtogomphoceratidae
Cyrtogomphoceras turgidum, Cyrtogomphoceras nutatum, Cyrtogomphoceras baffinense, Cyrtogomphoceras thompsoni, Cyrtogomphoceras alcocki n. sp.
Cyrtogomphoceras turgidum
Cyrtogomphoceras turgidum Troedsson(?)
 Multiceratoidea - Clinoceratidae
Whiteavesites winnipegensis
Gastropoda
 Euomphalina - Macluritidae
"Maclurites manitobensis" = Maclurina manitobensis, Maclurites altus, Maclurites ungava
"Maclurites manitobensis" = Maclurina manitobensis Whiteaves 1890 snail
Maclurites altus Wilson 1931 snail
Maclurites ungava Wilson 1938 snail
 Euomphalina - Holopeidae
Holopea gigantea n. sp.
Holopea gigantea n. sp. Nelson 1963 snail
 Murchisoniina - Subulitidae
Fusispira gigantea
Fusispira gigantea Wilson 1938 snail
 Murchisoniina - Trochonematidae
Trochonema coxi
Trochonema coxi Wilson 1938 snail
 Murchisoniina - Hormotomidae
Hormotoma winnipegensis
Hormotoma winnipegensis Whiteaves 1897 snail
Strophomenata
 Strophomenida - Sowerbyellidae
"Thaerodonta sp." = Eochonetes
"Thaerodonta sp." = Eochonetes Reed 1917
 Strophomenida - Strophomenidae
Strophomena spp.
Strophomena spp. Rafinesque and De Blainville 1824
Rhynchonellata
 Orthida - Platyorthidae
Diceromyonia sp.
Diceromyonia sp. Wang 1949
Anthozoa
 Stauriida - Stauriidae
Favistella alveolata, Palaeophyllum stokesi, Palaeophyllum halysitoides
 Stauriida - Streptelasmatidae
Grewingkia robusta
Grewingkia robusta Whiteaves 1896 horn coral
 Sarcinulida - Syringophyllidae
Calapoecia anticostiensis
Calapoecia anticostiensis Billings 1865 tabulate coral
 Heliolitida - Plasmoporidae
Plasmopora lambei, Plasmopora pattersoni
Plasmopora lambei tabulate coral
Plasmopora pattersoni tabulate coral
 Heliolitida - Halysitidae
Manipora amicarum, Manipora irregularis, Manipora feildeni, Catenipora rubra, Catenipora stearni n. sp., Catenipora agglomeratiformis, Catenipora robusta, Catenipora aequabilis
Manipora amicarum tabulate coral
Manipora irregularis tabulate coral
Manipora feildeni tabulate coral
Catenipora rubra tabulate coral
Catenipora stearni n. sp. tabulate coral
Catenipora agglomeratiformis Hall 1900 tabulate coral
Catenipora robusta Wilson 1926 tabulate coral
Catenipora aequabilis Teichert 1937 tabulate coral
 Favositida - Favositidae
? Saffordophyllum portagechutense n. sp.
? Saffordophyllum portagechutense n. sp. tabulate coral
Chlorophyceae
  - Receptaculitidae
Receptaculites sp.
Receptaculites sp. Defrance 1827