PBDB Collection

Cobourg Hill (S3) No 1, west railway-cut, lot 16, Lake Simcoe area (Ordovician of Canada)

Where: Ontario, Canada (44.5° N, 79.0° W: paleocoordinates 24.9° S, 55.0° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: upper Member (Verulam Formation), Caradoc (458.4 - 449.5 Ma)

• member-level stratigraphic resolution

Environment/lithology: deep subtidal; gray limestone and argillaceous limestone

• "[B]rownish grey and grey, fine- to coarse-crystalline, bioclastic, crinoidal limestone in beds an inch to 3 inches thick, together with minor amounts of argillaceous limestone and granular fragmental limestone. The strata locally weather grey and brown into beds 8 to 10 inches thick. A peculiar weathering phenomenon, involving a thin, regular, discoidal sheeting effect, oblique to individual beds, and cutting across them, is characteristic and is considered to be crossbedding. On the uppermost surface and visible at only two localities within the map-area, are large ripple-like structures, as much as 30 inches in wave length and 6 inches in amplitude. They are considered to be para-ripples modified by glacial scour action."

Size class: macrofossils

Primary reference: B. A. Liberty. 1969. Palaeozoic geology of the Lake Simcoe Area, Ontario. Geological Survey of Canada Memoirs (355)1-201 [S. Holland/T. Hanson/T. Hanson]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 26276: authorized by Steven Holland, entered by Tori Hanson on 10.10.2002, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Licrophycus
-	Licrophycus minor Licrophycus minor

Rhombifera - Pleurocystitidae	Pleurocystites sp. Pleurocystites sp.
Stenolaemata
Cyclostomata - Corynotrypidae	Corynotrypa inflata Corynotrypa inflata Nicholson 1875
Trepostomata - Heterotrypidae	Dekayella trentonensis, Dekayia sp., Dekayia typica Dekayella trentonensis Dekayia sp. Milne-Edwards and Haime 1851 Dekayia typica
Trepostomata - Halloporidae	Hallopora multitabulata Hallopora multitabulata Ulrich 1886
Trepostomata - Aisenvergiidae	Eridotrypa aedilis Eridotrypa aedilis Eichwald 1855
Trepostomida - Monticuliporidae	Prasoporina selwyni, Mesotrypa angularis Prasoporina selwyni Mesotrypa angularis M. angularis parvatrypa
Rhynchonellata
Atrypida - Anazygidae	"Zygospira recurvirostris" = Anazyga recurvirostra "Zygospira recurvirostris" = Anazyga recurvirostra Hall 1847
Orthida - Draboviidae	Pionodema sp. Pionodema sp. Foerste 1912
Orthida - Dalmanellidae	"Resserella whittakeri" = Dalmanella whittakeri, Paucicrura rogata "Resserella whittakeri" = Dalmanella whittakeri Ruedemann 1921 Paucicrura rogata Sardeson 1892
Orthida - Plaesiomyidae	Dinorthis cf. pectinella Dinorthis cf. pectinella Emmons 1842 D. cf. pectinella and D. pectinella sweeneyi
Protorthida - Skenidiidae	? Skenidioides merope ? Skenidioides merope
Pentamerida - Parastrophinidae	Parastrophina hemiplicata Parastrophina hemiplicata Hall 1847
Rhynchonellida - Rhynchotrematidae	Rhynchotrema increbescens Rhynchotrema increbescens Hall 1847
Strophomenata
Billingsellida - Clitambonitidae	Vellamo trentonensis Vellamo trentonensis Raymond 1921
Strophomenida - Sowerbyellidae	Sowerbyella minuta, Sowerbyella subovalis, "Sowerbyella sericea" = Sowerbyella (Sowerbyella) sericea, Sowerbyella cf. curdsvillensis Sowerbyella minuta Sowerbyella subovalis Wilson 1932 "Sowerbyella sericea" = Sowerbyella (Sowerbyella) sericea Sowerby 1839 Sowerbyella cf. curdsvillensis Foerste 1912
Strophomenida - Strophomenidae	Opikina platys, Opikina rugosa, Strophomena delicatula, Strophomena incurvata, Strophomena cf. billingsi, Strophomena cf. dignata Opikina platys Wilson 1944 Opikina rugosa Wilson 1921 O. rugosa and O. rugosa avita Strophomena delicatula Strophomena incurvata Shephard 1838 Strophomena cf. billingsi Winchell and Schuchert 1893 Strophomena cf. dignata Fenton 1928
Strophomenida - Rafinesquinidae	Rafinesquina esmondensis, Rafinesquina cf. okulitchi, Rafinesquina semicircularis, "Rafinesquina alata" = Rafinesquina alternata alata, "Rafinesquina intermedia" = Rafinesquina alternata intermedia, Rafinesquina trentonensis Rafinesquina esmondensis R. esmondensis borealis Rafinesquina cf. okulitchi Rafinesquina semicircularis "Rafinesquina alata" = Rafinesquina alternata alata Wilson 1944 Rafinesquina alternata alata "Rafinesquina intermedia" = Rafinesquina alternata intermedia Wilson 1944 Rafinesquina alternata intermedia Rafinesquina trentonensis Hall 1847
Lingulata
Lingulida - Obolidae	"Lingula placibilis" = Glossina placibilis "Lingula placibilis" = Glossina placibilis Sinclair 1945
Craniata
Trimerellida - Trimerellidae	Dinobolus canadensis Dinobolus canadensis
Craniopsida - Craniopsidae	"Pholidops trentonensis" = Craniops "Pholidops trentonensis" = Craniops
Bivalvia
Myalinida - Ambonychiidae	Ambonychia sp. Ambonychia sp. Hall 1847 clam
Modiomorphida - Modiomorphidae	"Endodesma cf. gesneri" = Cymatonota, Modiolopsis cf. lata "Endodesma cf. gesneri" = Cymatonota clam Modiolopsis cf. lata clam
Solemyida - Ctenodontidae	Ctenodonta compressa Ctenodonta compressa clam
Gastropoda
Bellerophontida - Sinuitidae	Sinuites cancellatus Sinuites cancellatus Hall 1847 snail S. cancellatus and S. cancellatus angularis
Bellerophontida - Temnodiscidae	"? Tropidodiscus cf. disculus" = Alaskadiscus disculus "? Tropidodiscus cf. disculus" = Alaskadiscus disculus Billings 1860 snail
Bellerophontida - Bucaniidae	"Bucania punctifrons" = Undulabucania punctifrons "Bucania punctifrons" = Undulabucania punctifrons Emmons 1842 snail
Euomphalina - Platyceratidae	Cyclonema gracile Cyclonema gracile Ulrich and Scofield 1897 snail
Euomphalina - Lesueurillidae	"Eccyliomphalus ottawaensis" = Eccyliopterus ottawaensis "Eccyliomphalus ottawaensis" = Eccyliopterus ottawaensis Billings 1860 snail
Murchisoniina - Loxonematidae	Omospira alexandra, "Hormotoma trentonensis" = Omospira trentonensis Omospira alexandra Billings 1865 snail "Hormotoma trentonensis" = Omospira trentonensis Ulrich and Scofield 1897 snail
Murchisoniina - Eotomariidae	Eotomaria dryope, Liospira progne Eotomaria dryope Billings 1865 snail E. dryope plana Liospira progne Billings 1860 snail
Murchisoniina - Lophospiridae	"Lophospira saffordi" = Paupospira oweni, Lophospira perangulata, Lophospira ventricosa "Lophospira saffordi" = Paupospira oweni Ulrich and Scofield 1897 snail Lophospira perangulata Hall 1847 snail Lophospira ventricosa Hall 1847 snail
Murchisoniina - Murchisoniidae	"Hormotoma salteri" = Cyrtostropha salteri "Hormotoma salteri" = Cyrtostropha salteri Ulrich and Scofield 1897 snail H. salteri canadensis
Murchisoniina - Hormotomidae	Hormotoma gracilis Hormotoma gracilis Hall 1847 snail
Trilobita
Asaphida - Asaphidae	Isotelus sp. Isotelus sp. Dekay 1824 trilobite
Corynexochida - Illaenidae	Bumastus sp., "Illaenus americanus" = Thaleops laurentiana, Bumastoides billingsi Bumastus sp. Murchison 1839 trilobite "Illaenus americanus" = Thaleops laurentiana Amati and Westrop 2004 trilobite Bumastoides billingsi Raymond and Narraway 1908 trilobite
Phacopida - Encrinuridae	Encrinurus sp. Encrinurus sp. Emmrich 1844 trilobite
Phacopida - Cheiruridae	"Ceraurus dentatus" = Gabriceraurus dentatus, Ceraurus pleurexanthemus "Ceraurus dentatus" = Gabriceraurus dentatus Raymond and Barton 1913 trilobite Ceraurus pleurexanthemus Green 1832 trilobite
Proetida - Bathyuridae	"Raymondites cf. ingalli" = Bathyurus (Raymondites) ingalli "Raymondites cf. ingalli" = Bathyurus (Raymondites) ingalli Raymond 1913 trilobite