St. Martin Mbr., Laval Fm., upper Chazyan (Ordovician of Canada)

Where: Quebec, Canada (47.0° N, 72.0° W: paleocoordinates 27.4° S, 54.0° W)

• basin-level geographic resolution

When: St. Martin Member (Laval Formation), Chazyan (468.1 - 460.9 Ma)

• "brach-bry-pelmatozoan-trilobite-ostracod fauna. M. Ord., upper Chazyan."

• member-level stratigraphic resolution

Environment/lithology: shallow subtidal; carbonate and shale

• "pelmatozoan calcarenite and shale. nearshore. BA3? algae present"

Size class: macrofossils

Primary reference: H. J. Hofmann. 1982. Middle to late Ordovician fossiliferous rocks of the Montreal area. In Y. Globensky (ed.), 3rd North American Paleontology Convention Field Trips Guidebook. Montreal Quebec D1-D41 [M. Uhen/J. Ju/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 311: authorized by Jack Sepkoski, entered by Mike Sommers on 20.11.1998

Creative Commons license: CC BY (attribution)

Taxonomic list

• "H.J. Hofmann, 1982. Middle to late Ord. fossiliferous rocks of the Montreal area. pp.D1-D41. in Y. Globensky (ed) 3rd N. Amer. Paleont. Conv. Field Trips Guidebook. Montreal Quebec"
Trilobita
 Corynexochida - Illaenidae
Bumastus sp. Murchison 1839 trilobite
originally entered as "Rumastus sp."
 Phacopida - Pterygometopidae
"Calliops sp." = Calyptaulax
"Calliops sp." = Calyptaulax Cooper 1930 trilobite
 Phacopida - Cheiruridae
Kawina sp. Barton 1916 trilobite
Sphaerexochus sp. Beyrich 1845 trilobite
 Harpida - Harpetidae
Eoharpes sp. Raymond 1905 trilobite
 Asaphida - Asaphidae
Isotelus sp. Dekay 1824 trilobite
Basilicus sp. Salter 1849 trilobite
Vogdesia sp. Raymond 1910 trilobite
Ostracoda
 Palaeocopida -
Eurychilina sp. Ulrich 1889 ostracod
and others
Strophomenata
 Orthotetida - Triplesiidae
Onychoplecia sp. Cooper 1956
 Billingsellida - Clitambonitidae
? Atelelasma sp. Cooper 1956
originally entered as "? Atelelasma sp."
 Strophomenida - Glyptomenidae
Glyptomena sp. Cooper 1956
Rhynchonellata
 Pentamerida - Camerellidae
Camerella sp. Billings 1859
 Rhynchonellida - Trigonirhynchiidae
Rostricellula sp. Ulrich and Cooper 1942
2 species
 Rhynchonellida - Sphenotretidae
? Dorytreta sp.
originally entered as "? Dorytreta sp."
 Orthida -
Orthida indet. Schuchert and Cooper 1932
Orthoidea indet. Woodward 1852
 Orthida - Glyptorthidae
Glyptorthis sp. Foerste 1914
 Orthida - Orthidae
? Orthambonites sp. Pander 1830
originally entered as "? Orthambonites sp."
 Orthida - Plaesiomyidae
 Orthida - Hesperorthidae
Hesperorthis sp. Schuchert and Cooper 1931
 Orthida - Plectorthidae
Mimella sp. Cooper 1930
2 species
Lingulata
 Lingulida - Obolidae
Lingulella sp. Salter 1866
 Siphonotretida - Siphonotretidae
Schizambon sp. Walcott 1884
Gastropoda
 Euomphalina - Raphistomatidae
Raphistoma sp. Hall 1847 snail
2 species
 Bellerophontida - Bucaniidae
Bucania sp. Hall 1847 snail
Cephalopoda
 Endocerida - Endoceratidae
Vaginoceras sp. Hyatt 1884
Stenolaemata
  - Phylloporinidae
Phylloporina sp. Foerste 1887
 Trepostomata -
Trepostomata indet. Ulrich 1882
2 types
Rhombifera
 Glyptocystitoida - Cheirocrinidae
Cheirocrinus sp. Eichwald 1856
 Parablastoidea - Blastocystidae
Blastoidocrinus sp. Billings 1859
Paracrinoidea
 Platycystitida - Malocystitidae
Malocystites sp. Billings 1858
 Platycystitida - Platycystitidae
Canadocystis sp.
originally entered as "Canadocyrtis sp."
Eocrinoidea
 Gogiida -
  -
Crinoidea
 Porocrinida -
Palaeocrinus sp. Billings 1859 Sea lily
Anthozoa
 Sarcinulida - Billingsariidae
Billingsaria sp. Okulitch 1936 tabulate coral
Scyphozoa
  -
Conularina sp. jellyfish
3 species