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 (460.9 - 449.5 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.
unclassified
  -
Edriotrypa cf. minor
Edriotrypa cf. E. aedalis minor
Chlorophyceae
  - Receptaculitidae
Anthozoa
 Stauriida - Stauriidae
Favistella sp. Dana 1846 horn coral
 Stauriida - Streptelasmatidae
Streptelasma spp. Hall 1847 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 tabulate coral
Plasmopora pattersoni tabulate coral
 Sarcinulida - Syringophyllidae
Calapoecia anticostiensis Billings 1865 tabulate coral
Calapoecia canadensis anticostiensis
Cephalopoda
 Endocerida - Endoceratidae
Endoceras spp. Hall 1847
Endoceras baffinense Foerste 1928
 Orthocerida - Proteoceratidae
 Actinocerida - Actinoceratidae
Kochoceras sp. Troedsson 1926
"Kochoceras troedssoni" = Kochoceras cuneiforme Troedsson 1926
Actinoceras sp. Bronn 1837
 Oncocerida - Diestoceratidae
 Oncocerida - Oncoceratidae
 Discosorida - Westonoceratidae
 Discosorida - Cyrtogomphoceratidae
 Multiceratoidea - Apsidoceratidae
Gastropoda
 Murchisoniina - Subulitidae
Fusispira inflata2 Meek and Worthen 1870 snail
 Murchisoniina - Hormotomidae
"Lophospira cf. minnesotensis" = Hormotoma minnesotensis1, Hormotoma rotundivolvis
"Lophospira cf. minnesotensis" = Hormotoma minnesotensis1 Ulrich and Scofield 1897 snail
Lophospira cf. L. angustina minnesotensis
Hormotoma rotundivolvis Roy 1941 snail
 Murchisoniina - Murchisoniidae
Murchisoniidae spp.4 Koken 1896 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 - Lophospiridae
Lophospira spironema2 Ulrich and Scofield 1897 snail
 Murchisoniina - Gosseletinidae
"? Seelya (Plethospira) ulrichi" = Cataschisma ulrichi2
"? Seelya (Plethospira) ulrichi" = Cataschisma ulrichi2 Schuchert 1900 snail
 Murchisoniina - Eotomariidae
Liospira americana2 Billings 1860 snail
"Liospira mundula" = Paraliospira mundula1 Ulrich and Scofield 1897 snail
? Eotomaria robinsoni n. sp.1 Roy 1941 snail
 Bellerophontida -
Bellerophontoidea sp.4 M'Coy 1851 snail
 Bellerophontida - Bellerophontidae
"Bellerophon similis" = Sphenosphaera similis1
"Bellerophon similis" = Sphenosphaera similis1 Ulrich and Scofield 1897 snail
 Bellerophontida - Sinuitidae
"Protowarthia pervoluta" = Sinuites pervoluta2
"Protowarthia pervoluta" = Sinuites pervoluta2 Ulrich and Scofield 1897 snail
 Bellerophontida - Plectonotidae
Tetranota obsoleta2 Ulrich and Scofield 1897 snail
 Bellerophontida - Bucaniidae
Kokenospira costalis1 Ulrich and Scofield 1897 snail
 Euomphalina - Holopeidae
Holopea arctica n. sp.2 Schuchert 1900 snail
 Euomphalina - Macluritidae
"Maclurites ? crassus" = Maclurites crassa1, "Maclurina ? cuneata" = Maclurites cuneata1, Maclurina ? manitobensis1
"Maclurites ? crassus" = Maclurites crassa1 Ulrich and Scofield 1897 snail
"Maclurina ? cuneata" = Maclurites cuneata1 Whitfield 1878 snail
Maclurina ? manitobensis1 Whiteaves 1890 snail
Bivalvia
 Cyrtodontida - Cyrtodontidae
Cyrtodonta ? gibbera2 Ulrich 1894 clam
"Whitella arcticus n. sp." = Cyrtodontula2 clam
Vanuxemia baffinensis n. sp.2 clam
 Modiomorphida - Modiomorphidae
 Solemyida - Ctenodontidae
Ctenodonta ulrichi n. sp.1 clam
Ctenodonta carpenderi n. sp.2 clam
Ctenodonta cf. subnasuta2 Ulrich 1894 clam
Strophomenata
 Strophomenida - Sowerbyellidae
Sowerbyella sp. Jones 1928
 Strophomenida - Rafinesquinidae
Rafinesquina sp. Hall and Clarke 1892
"Rafinesquina subnutans" = Rafinesquina declivis subnutans Roy 1941
Rafinesquina declivis subnutans
 Strophomenida - Strophomenidae
Strophomena spp., "Strophomena undulosa" = Nasutimena undulosa
Strophomena spp. Rafinesque and De Blainville 1824
"Strophomena undulosa" = Nasutimena undulosa Roy 1941
Rhynchonellata
 Rhynchonellida - Rhynchotrematidae
Rhynchotrema breve
Rhynchotrema anticostiense breve
Rhynchotrema sp. Hall 1860
"Rhynchotrema arcticum" = Hiscobeccus arcticus Roy 1941
Rhynchotrema capax arcticum
 Orthida - Plaesiomyidae
Austinella cooperi, "? Austinella subcircularis" = Plaesiomys subcircularis, "Dinorthis arctica" = Dinorthis meedsi arctica3
"? Austinella subcircularis" = Plaesiomys subcircularis Roy 1941
"Dinorthis arctica" = Dinorthis meedsi arctica3 Schuchert 1900
 Orthida - Hesperorthidae
 Orthida - Glyptorthidae
 Orthida - Plectorthidae
 Orthida - Platystrophiidae
 Orthida - Dalmanellidae
"Dalmanella diminutiva" = Resserella diminutiva Roy 1941
? Dalmanella sp. Hall and Clarke 1892
 Protorthida - Skenidiidae
? Skenidioides sp. Schuchert and Cooper 1931
 Atrypida - Cyclospiridae
 Atrypida - Anazygidae
 Pentamerida - Parastrophinidae
"Parastrophinella minor" = Parastrophina minor
"Parastrophinella minor" = Parastrophina minor Roy 1941
Parastrophinella hemiplicata minor
Stenolaemata
 Trepostomata - Trematoporidae
Batostoma sp. Ulrich 1882
 Trepostomata - Halloporidae
Dianulites sp. Eichwald 1829
 Trepostomida - Monticuliporidae
Prasopora sp. Nicholson and Etheridge 1877
Hyolitha
 Hyolithida - Hyolithidae
Ostracoda
 Leperditicopida - Leperditiidae
 Leperditicopida - Isochilinidae
 Palaeocopida - Beyrichiidae
 Podocopida - Bairdiidae
 Podocopida - Bythocyprididae
Bythocypris aff. cylindrica Hall 1871 ostracod
 Leperditellocopida - Primitiidae
 Leperditellocopida - Aparchitidae
 Hollinocopida - Eurychilinidae
Eurychilina sp. Ulrich 1889 ostracod
Trilobita
 Harpetida - Harpetidae
Harpes sp. Goldfuss 1839 trilobite
 Asaphida - Asaphidae
Isotelus gigas Dekay 1824 trilobite
subspecies latior
Isotelus cf. iowensis Owen 1852 trilobite
 Asaphida - Remopleurididae
Remopleurides sp. Portlock 1843 trilobite
 Corynexochida - Illaenidae
"Illaenus punctatus" = Thaleops nunavutica Amati and Westrop 2004 trilobite
Bumastus sp. Murchison 1839 trilobite
 Proetida - Dimeropygidae
 Phacopida - Encrinuridae
Encrinurus sp. Emmrich 1844 trilobite
 Phacopida - Cheiruridae
Ceraurinus icarus Billings 1860 trilobite
subspecies noduliferus
Ceraurus sp. Green 1832 trilobite
 Phacopida - Calymenidae
"Calymene croneisi" = Flexicalymene croneisi Roy 1941 trilobite
 Phacopida - Pterygometopidae
"Calliops brevis" = Calliops brevis5, "Eomonorachus deloi" = Calliops brevis, Calyptaulax sillimani, Pterygometopus spp.
"Calliops brevis" = Calliops brevis5 Roy 1941 trilobite
subspecies brevis
"Eomonorachus deloi" = Calliops brevis Roy 1941 trilobite
Calyptaulax sillimani Roy 1941 trilobite
Pterygometopus spp. Schmidt 1881 trilobite
Crinoidea
 Porocrinida -
Carabocrinus sp. Billings 1857 Sea lily
 Rhombifera - Cheirocrinidae
Cheirocrinus sp. Eichwald 1856