Cobourg Hill (S6) No 1, west railway-cut, lot 15, 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: Climacograptus spiniferus graptolite zone, Upper Member (Verulam Formation), Chatfieldian (453.8 - 451.0 Ma)
• C1
• 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 26277: 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
| Crinoidea | |
|
Reteocrinus sp. Billings 1859 Sea lily | |
| Strophomenata | |
|
Vellamo trentonensis Raymond 1921 | |
Sowerbyella subovalis, "Sowerbyella sericea" = Sowerbyella (Sowerbyella) sericea, Sowerbyella cf. curdsvillensis
Sowerbyella subovalis Wilson 1932
"Sowerbyella sericea" = Sowerbyella (Sowerbyella) sericea Sowerby 1839
Sowerbyella cf. curdsvillensis Foerste 1912 | |
Rafinesquina normaloides, Rafinesquina praedeltoidea, "Rafinesquina alata" = Rafinesquina alternata alata2, Rafinesquina trentonensis
"Rafinesquina alata" = Rafinesquina alternata alata2 Wilson 1944 R. alternata alata and R. alternata intermedia and R. alternata plana and R. alternata platys
Rafinesquina trentonensis Hall 1847 | |
Strophomena cf. dignata, Opikina cf. sinclairi, Opikina cf. wagneri, Opikina cf. septata, Opikina rugosa, Opikina platys
Strophomena cf. dignata Fenton 1928
Opikina platys Wilson 1944 | |
| Rhynchonellata | |
|
Parastrophina hemiplicata Hall 1847 | |
"Zygospira recurvirostris" = Anazyga recurvirostra
"Zygospira recurvirostris" = Anazyga recurvirostra Hall 1847 | |
"Resserella whittakeri" = Dalmanella whittakeri, Paucicrura rogata
"Resserella whittakeri" = Dalmanella whittakeri Ruedemann 1921
Paucicrura rogata Sardeson 1892 | |
"Valcourea cf. deflecta" = Campylorthis deflecta, "Dinorthis cf. iphigenia" = Plaesiomys iphigenia, Dinorthis cf. calderi, Dinorthis cf. ottawaensis, Dinorthis pectinella
"Valcourea cf. deflecta" = Campylorthis deflecta Conrad 1843
"Dinorthis cf. iphigenia" = Plaesiomys iphigenia Billings 1865 D. cf. iphigenia and D. iphigenia media
| |
|
Rhynchotrema increbescens Hall 1847 | |
| Stenolaemata | |
| Gastropoda | |
|
Bucania halli Ulrich and Scofield 1897 snail | |
"? Tropidodiscus disculus" = Alaskadiscus disculus
"? Tropidodiscus disculus" = Alaskadiscus disculus Billings 1860 snail | |
|
"Sinuites cancellatus" = Sinuites cancellatus Hall 1847 snail S. cancellatus and S. cancellatus angularis
| |
|
Cyclonema gracile Ulrich and Scofield 1897 snail | |
"Helicotoma spinosa" = Linsleyella spinosa
"Helicotoma spinosa" = Linsleyella spinosa Salter 1859 snail | |
|
Trochonema fragile Ulrich and Scofield 1897 snail
"Trochonema umbilicatum" = Trochonema umbilicata Hall 1847 snail
Trochonema vagrans Ulrich and Scofield 1897 snail | |
|
"Lophospira saffordi" = Paupospira oweni Ulrich and Scofield 1897 snail
Lophospira perangulata Hall 1847 snail
Lophospira cf. ventricosa Hall 1847 snail | |
|
Hormotoma gracilis Hall 1847 snail | |
"Hormotoma salteri" = Cyrtostropha salteri
| |
|
Liospira progne Billings 1860 snail
Liospira micula Hall and Whitney 1862 snail
Eotomaria sp. Ulrich and Scofield 1897 snail | |
"Hormotoma trentonensis" = Omospira trentonensis
"Hormotoma trentonensis" = Omospira trentonensis Ulrich and Scofield 1897 snail | |
| Bivalvia | |
"Cleidophorus sp." = Nuculites
"Cleidophorus sp." = Nuculites Conrad 1841 clam | |
|
Ctenodonta cf. logani Salter 1859 clam
Ctenodonta cf. madisonensis Ulrich 1894 clam
Ctenodonta nasuta Hall 1847 clam | |
|
Plethocardia suberecta Ulrich 1894 clam | |
|
Saffordia cf. ventralis Ulrich 1894 clam | |
|
Cuneamya sp. Hall and Whitfield 1875 clam | |
|
Paramodiola sp. Isberg 1934 clam | |
"Ambonychia amygdalina" = Ambonychinia amygdalina
"Ambonychia amygdalina" = Ambonychinia amygdalina Hall 1847 clam | |
"Whitella compressa" = Cyrtodontula compressa, Vanuxemia abrupta, Vanuxemia dixonensis, Vanuxemia media, Matheria rugosa
"Whitella compressa" = Cyrtodontula compressa Ulrich 1890 clam
Vanuxemia abrupta clam
Vanuxemia dixonensis clam
Vanuxemia media clam
Matheria rugosa clam | |
| Trilobita | |
"Illaenus americanus" = Thaleops laurentiana
"Illaenus americanus" = Thaleops laurentiana Amati and Westrop 2004 trilobite | |
"Flexicalymene senaria" = Flexicalymene (Flexicalymene) senaria
"Flexicalymene senaria" = Flexicalymene (Flexicalymene) senaria Conrad 1841 trilobite | |
|
Achatella achates Billings 1860 trilobite | |
| Anthozoa | |
|
Streptelasma corniculum Hall 1847 horn coral | |
| Scyphozoa | |
|
Conularia trentonensis jellyfish | |