Silliman's Fossil Mount Brachiopods (Ordovician to of Canada)

Where: Nunavut, Canada (63.7° N, 69.0° W: paleocoordinates 10.9° S, 39.9° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Amadjuak Formation, Edenian to Edenian (451.0 - 449.6 Ma)

• Sproat & Jin indicate that this might go up to the middle of the Maysvillian.

• formation-level stratigraphic resolution

Environment/lithology: dolomitic limestone and calcareous shale

• Environmental call by T. Hanson.
• "Throughout the Mount, the top 50 feet of these beds consists of massive dolomite limestone, the next 75 feet of thin-bedded limestone and dolomite, and the lower 175 feet of calcareous shale with some interbedded limestone."

Size class: macrofossils

Primary reference: A. K. Miller, W. Youngquist, and C. Collinson. 1954. Ordovician cephalopod fauna of Baffin Island. Geological Society of America Memoir 62:1-234 [S. Holland/T. Hanson/T. Hanson]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 24120: authorized by Steven Holland, entered by Tori Hanson on 31.07.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

• From Roy 1941.
Show authors, comments, and common names
Rhynchonellata
 Pentamerida - Parastrophinidae
"Parastrophinella minor" = Parastrophina minor
"Parastrophinella minor" = Parastrophina minor Roy 1941
Parastrophinella hemiplicata minor
 Rhynchonellida - Rhynchotrematidae
Lepidocyclus sp., "Lepidocyclus arcticus" = Hiscobeccus arcticus, "Lepidocyclus breve" = Hiscobeccus arcticus
Lepidocyclus sp. Wang 1949
"Lepidocyclus arcticus" = Hiscobeccus arcticus Roy 1941
Lepidocyclus capax arcticus
"Lepidocyclus breve" = Hiscobeccus arcticus Roy 1941
Lepidocyclus anticostiense breve
 Atrypida - Anazygidae
Zygospira maynei
 Atrypida - Cyclospiridae
Cyclospira schucherti, Cyclospira vokesi
 Orthida - Glyptorthidae
Glyptorthis bellarugosa
 Orthida - Plaesiomyidae
Austinella cooperi, "Plaesiomys meedsi" = Dinorthis meedsi, Plaesiomys arctica, "Austinella subcircularis" = Plaesiomys subcircularis, "Austinella aff. subcircularis" = Plaesiomys subcircularis
"Plaesiomys meedsi" = Dinorthis meedsi Winchell and Schuchert 1892
Plaesiomys arctica
Plaesiomys meedsi arctica
"Austinella subcircularis" = Plaesiomys subcircularis Roy 1941
"Austinella aff. subcircularis" = Plaesiomys subcircularis Roy 1941
 Orthida - Hesperorthidae
Hesperorthis interplicata
 Orthida - Platystrophiidae
Platystrophia magnisulcata
 Orthida - Plectorthidae
Plectorthis inaequiconvexa
 Orthida - Dalmanellidae
"Resserella sillimani" = Dalmanella sillimani, ? Resserella sp., Resserella diminutiva
"Resserella sillimani" = Dalmanella sillimani Roy 1941
? Resserella sp. Bancroft 1928
 Protorthida - Skenidiidae
? Skenidioides sp.
? Skenidioides sp. Schuchert and Cooper 1931
Strophomenata
 Strophomenida - Strophomenidae
"Strophomena undulosa" = Nasutimena undulosa, Strophomena spp.
"Strophomena undulosa" = Nasutimena undulosa Roy 1941
Strophomena spp. Rafinesque and De Blainville 1824
 Strophomenida - Rafinesquinidae
Rafinesquina pronis, Rafinesquina productiformis, Rafinesquina sp., Rafinesquina declivis
Rafinesquina sp. Hall and Clarke 1892
 Strophomenida - Sowerbyellidae
"Thaerodonta sp." = Eochonetes
"Thaerodonta sp." = Eochonetes Reed 1917