Silliman's Fossil Mount (Roy 1941) (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: Climacograptus spiniferus graptolite zone, Unit 1 Member (Amadjuak Formation), Chatfieldian to Chatfieldian (453.8 - 450.2 Ma)

• Formation ID from Zhang & Pell (2014). Given McCracken & Bolton 2000, this probably is Unit 1

• 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 24116: authorized by Steven Holland, entered by Tori Hanson on 31.07.2002, edited by Pete Wagner and Melanie Hopkins

Creative Commons license: CC BY (attribution)

Taxonomic list

• Collected by Sharat K. Roy, 1941.
Show authors, comments, and common names
unclassified
  -
Edriotrypa bassleri, Edriotrypa cf. minor
Edriotrypa cf. minor
Edriotrypa cf. E. aedalis minor
Chlorophyceae
  - Receptaculitidae
Receptaculites spp., ? Receptaculites fieldi
Receptaculites spp. Defrance 1827
Anthozoa
 Stauriida - Streptelasmatidae
Streptelasma spp.
Streptelasma spp. Hall 1847 horn coral
 Stauriida - Stauriidae
Favistella sp.
Favistella sp. Dana 1846 horn coral
 Heliolitida - Halysitidae
"Halysites cf. gracilis" = Catenipora gracilis, "Halysites agglomeratiformis" = Catenipora agglomeratiformis
"Halysites cf. gracilis" = Catenipora gracilis Hall in Foster and Whitney 1851 tabulate coral
"Halysites agglomeratiformis" = Catenipora agglomeratiformis Hall 1900 tabulate coral
 Heliolitida - Plasmoporidae
Plasmopora lambei, Plasmopora pattersoni
Plasmopora lambei tabulate coral
Plasmopora pattersoni tabulate coral
 Sarcinulida - Syringophyllidae
Calapoecia anticostiensis
Calapoecia anticostiensis Billings 1865 tabulate coral
Calapoecia canadensis anticostiensis
Cephalopoda
 Actinocerida - Actinoceratidae
? Leurorthoceras baffinense, Kochoceras sp., "Kochoceras troedssoni" = Kochoceras cuneiforme, Actinoceras sp.
Kochoceras sp. Troedsson 1926
"Kochoceras troedssoni" = Kochoceras cuneiforme Troedsson 1926
Actinoceras sp. Bronn 1837
 Orthocerida - Proteoceratidae
Ephippiorthoceras spp.
 Oncocerida - Diestoceratidae
Diestoceras milleri
 Oncocerida - Oncoceratidae
? Neumatoceras tumidum
 Discosorida - Westonoceratidae
Winnipegoceras laticurvatum, Westonoceras greggi
 Discosorida - Cyrtogomphoceratidae
Cyrtogomphoceras baffinense, Cyrtogomphoceras furnishi, Cyrtogomphoceras spp.
Cyrtogomphoceras spp. Foerste 1924
 Multiceratoidea - Apsidoceratidae
Charactoceras schucherti
 Endocerida - Endoceratidae
Endoceras spp., Endoceras baffinense
Endoceras spp. Hall 1847
Endoceras baffinense Foerste 1928
Gastropoda
 Euomphalina - Holopeidae
Holopea arctica n. sp.2
Holopea arctica n. sp.2 Schuchert 1900 snail
 Euomphalina - Macluritidae
"Maclurina ? cuneata" = Maclurites cuneata1, "Maclurites ? crassus" = Maclurites crassa1, Maclurina ? manitobensis1
"Maclurina ? cuneata" = Maclurites cuneata1 Whitfield 1878 snail
"Maclurites ? crassus" = Maclurites crassa1 Ulrich and Scofield 1897 snail
Maclurina ? manitobensis1 Whiteaves 1890 snail
 Bellerophontida -
Bellerophontoidea sp.4
Bellerophontoidea sp.4 M'Coy 1851 snail
 Bellerophontida - Plectonotidae
Tetranota obsoleta2
Tetranota obsoleta2 Ulrich and Scofield 1897 snail
 Bellerophontida - Sinuitidae
"Protowarthia pervoluta" = Sinuites pervoluta2
"Protowarthia pervoluta" = Sinuites pervoluta2 Ulrich and Scofield 1897 snail
 Bellerophontida - Bellerophontidae
"Bellerophon similis" = Sphenosphaera similis1
"Bellerophon similis" = Sphenosphaera similis1 Ulrich and Scofield 1897 snail
 Bellerophontida - Bucaniidae
Kokenospira costalis1
Kokenospira costalis1 Ulrich and Scofield 1897 snail
 Murchisoniina - Eotomariidae
? Eotomaria robinsoni n. sp.1, "Liospira mundula" = Paraliospira mundula1, Liospira americana2
? Eotomaria robinsoni n. sp.1 Roy 1941 snail
"Liospira mundula" = Paraliospira mundula1 Ulrich and Scofield 1897 snail
Liospira americana2 Billings 1860 snail
 Murchisoniina - Gosseletinidae
"? Seelya (Plethospira) ulrichi" = Cataschisma ulrichi2
"? Seelya (Plethospira) ulrichi" = Cataschisma ulrichi2 Schuchert 1900 snail
 Murchisoniina - Lophospiridae
Lophospira spironema2
Lophospira spironema2 Ulrich and Scofield 1897 snail
 Murchisoniina - Trochonematidae
"Trochonema (Eunema) robbinsi" = Globonema niota2, Trochonema madisonense4
"Trochonema (Eunema) robbinsi" = Globonema niota2 Hall 1861 snail
Trochonema madisonense4 Ulrich and Scofield 1897 snail
 Murchisoniina - Subulitidae
Fusispira inflata2
Fusispira inflata2 Meek and Worthen 1870 snail
 Murchisoniina - Hormotomidae
Hormotoma rotundivolvis, "Lophospira cf. minnesotensis" = Hormotoma minnesotensis1
"Lophospira cf. minnesotensis" = Hormotoma minnesotensis1 Ulrich and Scofield 1897 snail
Lophospira cf. L. angustina minnesotensis
 Murchisoniina - Murchisoniidae
Murchisoniidae spp.4
Murchisoniidae spp.4 Koken 1896 snail
Bivalvia
 Solemyida - Ctenodontidae
Ctenodonta baffinensis n. sp.2, Ctenodonta ulrichi n. sp.1, Ctenodonta carpenderi n. sp.2, Ctenodonta frobisherensis n. sp.2, Ctenodonta cf. subnasuta2
Ctenodonta ulrichi n. sp.1 clam
Ctenodonta carpenderi n. sp.2 clam
Ctenodonta cf. subnasuta2 Ulrich 1894 clam
 Modiomorphida - Modiomorphidae
Saffordia modesta2, Modiolodon arcticus n. sp.2, Whiteavesia symmetricus2
Modiolodon arcticus n. sp.2 clam
 Cyrtodontida - Cyrtodontidae
Cyrtodonta sillimanensis2, Cyrtodonta ? gibbera2, "Whitella arcticus n. sp." = Cyrtodontula2, Vanuxemia abrupta2, Vanuxemia baffinensis n. sp.2
Cyrtodonta ? gibbera2 Ulrich 1894 clam
"Whitella arcticus n. sp." = Cyrtodontula2 clam
Vanuxemia baffinensis n. sp.2 clam
Hyolitha
 Hyolithida - Hyolithidae
Hyolithes crowelli
Rhynchonellata
 Atrypida - Cyclospiridae
Cyclospira schucherti, Cyclospira vokesi
 Atrypida - Anazygidae
Zygospira maynei
 Pentamerida - Parastrophinidae
"Parastrophinella minor" = Parastrophina minor
"Parastrophinella minor" = Parastrophina minor Roy 1941
Parastrophinella hemiplicata minor
 Orthida - Dalmanellidae
"Dalmanella diminutiva" = Resserella diminutiva, ? Dalmanella sp., Dalmanella sillimani
"Dalmanella diminutiva" = Resserella diminutiva Roy 1941
? Dalmanella sp. Hall and Clarke 1892
 Orthida - Glyptorthidae
Glyptorthis bellarugosa
 Orthida - Plaesiomyidae
"Dinorthis arctica" = Dinorthis meedsi arctica3, "? Austinella subcircularis" = Plaesiomys subcircularis, Austinella cooperi
"Dinorthis arctica" = Dinorthis meedsi arctica3 Schuchert 1900
"? Austinella subcircularis" = Plaesiomys subcircularis Roy 1941
 Orthida - Hesperorthidae
Hesperorthis interplicata
 Orthida - Plectorthidae
Plectorthis inaequiconvexa
 Orthida - Platystrophiidae
Platystrophia magnisulcata
 Protorthida - Skenidiidae
? Skenidioides sp.
? Skenidioides sp. Schuchert and Cooper 1931
 Rhynchonellida - Rhynchotrematidae
"Rhynchotrema arcticum" = Hiscobeccus arcticus, Rhynchotrema breve, Rhynchotrema sp.
"Rhynchotrema arcticum" = Hiscobeccus arcticus Roy 1941
Rhynchotrema capax arcticum
Rhynchotrema breve
Rhynchotrema anticostiense breve
Rhynchotrema sp. Hall 1860
Strophomenata
 Strophomenida - Sowerbyellidae
Sowerbyella sp.
Sowerbyella sp. Jones 1928
 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 subnutans" = Rafinesquina declivis subnutans
Rafinesquina sp. Hall and Clarke 1892
"Rafinesquina subnutans" = Rafinesquina declivis subnutans Roy 1941
Rafinesquina declivis subnutans
Stenolaemata
 Trepostomida - Monticuliporidae
Prasopora sp., Atactoporella cf. schucherti
Prasopora sp. Nicholson and Etheridge 1877
 Trepostomata - Halloporidae
Dianulites sp.
Dianulites sp. Eichwald 1829
 Trepostomata - Trematoporidae
Batostoma sp.
Batostoma sp. Ulrich 1882
Ostracoda
 Palaeocopida - Beyrichiidae
Halliella jaynesi
 Palaeocopida - Primitiidae
Primitia cincinnatiensis
 Palaeocopida - Aparchitidae
? Aparchites sp.
 Palaeocopida - Eurychilinidae
Eurychilina bassleri, Eurychilina sp.
Eurychilina sp. Ulrich 1889 ostracod
 Podocopida - Bairdiidae
Krausella rawsoni, Krausella cf. inaequalis, Krausella sp.
Krausella sp. ostracod
 Podocopida - Bythocyprididae
Bythocypris aff. cylindrica
Bythocypris aff. cylindrica Hall 1871 ostracod
 Leperditicopida - Leperditiidae
Leperditia cf. ulrichi
 Leperditicopida - Isochilinidae
Isochilina convexa
Trilobita
 Phacopida - Pterygometopidae
Calyptaulax sillimani, Pterygometopus spp., "Calliops brevis" = Calliops brevis5, "Eomonorachus deloi" = Calliops brevis
Calyptaulax sillimani Roy 1941 trilobite
Pterygometopus spp. Schmidt 1881 trilobite
"Calliops brevis" = Calliops brevis5 Roy 1941 trilobite
subspecies brevis
"Eomonorachus deloi" = Calliops brevis Roy 1941 trilobite
 Phacopida - Calymenidae
Calymene macmillani, "Calymene croneisi" = Flexicalymene croneisi
"Calymene croneisi" = Flexicalymene croneisi Roy 1941 trilobite
 Phacopida - Encrinuridae
Encrinurus sp.
Encrinurus sp. Emmrich 1844 trilobite
 Phacopida - Cheiruridae
Ceraurinus icarus, Ceraurus cf. horridus, Ceraurus sp.
Ceraurinus icarus Billings 1860 trilobite
subspecies noduliferus
Ceraurus sp. Green 1832 trilobite
 Asaphida - Remopleurididae
Remopleurides sp.
Remopleurides sp. Portlock 1843 trilobite
 Asaphida - Asaphidae
Isotelus cf. iowensis, Isotelus gigas
Isotelus cf. iowensis Owen 1852 trilobite
Isotelus gigas Dekay 1824 trilobite
subspecies latior
 Proetida - Dimeropygidae
? Ischyrotoma raymondi
 Harpetida - Harpetidae
Harpes sp.
Harpes sp. Goldfuss 1839 trilobite
 Corynexochida - Illaenidae
"Illaenus punctatus" = Thaleops nunavutica, Illaenus baffinlandicus, Illaenus cf. groenlandicus, Bumastus sp.
"Illaenus punctatus" = Thaleops nunavutica Amati and Westrop 2004 trilobite
Bumastus sp. Murchison 1839 trilobite
 Rhombifera - Cheirocrinidae
Cheirocrinus sp.
Cheirocrinus sp. Eichwald 1856
Crinoidea
 Porocrinida -
Carabocrinus sp.
Carabocrinus sp. Billings 1857 Sea lily
1Roy 1941; 2Schuchert 1900; 3Wagner 2020; 4Wagner 2023; 5Whittington 1954