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: 14.9° S, 106.9° W (Wright 2013)
• 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: CC0 (CC0)
Taxonomic list
Show authors, comments, and common names
| Bivalvia | |
|
Ctenodonta cf. logani Salter 1859 clam
Ctenodonta nasuta Hall 1847 clam
Ctenodonta cf. madisonensis Ulrich 1894 clam | |
"Cleidophorus sp." = Nuculites
"Cleidophorus sp." = Nuculites Conrad 1841 clam | |
|
Plethocardia suberecta Ulrich 1894 clam | |
|
Saffordia cf. ventralis Ulrich 1894 clam | |
|
Cuneamya sp. Hall and Whitfield 1875 clam | |
|
Paramodiola sp. Isberg 1934 clam | |
Vanuxemia abrupta, Vanuxemia dixonensis, Vanuxemia media, Matheria rugosa, "Whitella compressa" = Cyrtodontula compressa
Vanuxemia abrupta clam
Vanuxemia dixonensis clam
Vanuxemia media clam
Matheria rugosa clam
"Whitella compressa" = Cyrtodontula compressa Ulrich 1890 clam | |
"Ambonychia amygdalina" = Ambonychinia amygdalina
"Ambonychia amygdalina" = Ambonychinia amygdalina Hall 1847 clam | |
| Gastropoda | |
|
"Sinuites cancellatus" = Sinuites cancellatus Hall 1847 snail S. cancellatus and S. cancellatus angularis
| |
"? Tropidodiscus disculus" = Alaskadiscus disculus
"? Tropidodiscus disculus" = Alaskadiscus disculus Billings 1860 snail | |
|
Bucania halli Ulrich and Scofield 1897 snail | |
"Helicotoma spinosa" = Linsleyella spinosa
"Helicotoma spinosa" = Linsleyella spinosa Salter 1859 snail | |
|
Cyclonema gracile Ulrich and Scofield 1897 snail | |
|
Hormotoma gracilis Hall 1847 snail | |
"Hormotoma salteri" = Cyrtostropha salteri
| |
|
Trochonema fragile Ulrich and Scofield 1897 snail
Trochonema vagrans Ulrich and Scofield 1897 snail
"Trochonema umbilicatum" = Trochonema umbilicata Hall 1847 snail | |
|
Lophospira perangulata Hall 1847 snail
Lophospira cf. ventricosa Hall 1847 snail
"Lophospira saffordi" = Paupospira oweni Ulrich and Scofield 1897 snail | |
"Hormotoma trentonensis" = Omospira trentonensis
"Hormotoma trentonensis" = Omospira trentonensis Ulrich and Scofield 1897 snail | |
|
Liospira micula Hall and Whitney 1862 snail
Liospira progne Billings 1860 snail
Eotomaria sp. Ulrich and Scofield 1897 snail | |
| Strophomenata | |
Rafinesquina normaloides, Rafinesquina praedeltoidea, Rafinesquina trentonensis, "Rafinesquina alata" = Rafinesquina alternata alata2
Rafinesquina trentonensis Hall 1847
"Rafinesquina alata" = Rafinesquina alternata alata2 Wilson 1944 R. alternata alata and R. alternata intermedia and R. alternata plana and R. alternata platys
| |
Opikina cf. sinclairi, Opikina cf. wagneri, Opikina rugosa, Opikina cf. septata, Opikina platys, Strophomena cf. dignata
Opikina platys Wilson 1944
Strophomena cf. dignata Fenton 1928 | |
Sowerbyella cf. curdsvillensis, "Sowerbyella sericea" = Sowerbyella (Sowerbyella) sericea, Sowerbyella subovalis
Sowerbyella cf. curdsvillensis Foerste 1912
"Sowerbyella sericea" = Sowerbyella (Sowerbyella) sericea Sowerby 1839
Sowerbyella subovalis Wilson 1932 | |
|
Vellamo trentonensis Raymond 1921 | |
| Rhynchonellata | |
|
Rhynchotrema increbescens Hall 1847 rhynchonellid brachiopod | |
|
Parastrophina hemiplicata Hall 1847 | |
"Zygospira recurvirostris" = Anazyga recurvirostra
"Zygospira recurvirostris" = Anazyga recurvirostra Hall 1847 | |
"Valcourea cf. deflecta" = Campylorthis deflecta, Dinorthis cf. calderi, Dinorthis cf. ottawaensis, Dinorthis pectinella, "Dinorthis cf. iphigenia" = Plaesiomys iphigenia
"Valcourea cf. deflecta" = Campylorthis deflecta Conrad 1843
"Dinorthis cf. iphigenia" = Plaesiomys iphigenia Billings 1865 D. cf. iphigenia and D. iphigenia media
| |
Paucicrura rogata, "Resserella whittakeri" = Dalmanella whittakeri
Paucicrura rogata Sardeson 1892
"Resserella whittakeri" = Dalmanella whittakeri Ruedemann 1921 | |
| Stenolaemata | |
| Artiopoda | |
"Illaenus americanus" = Thaleops laurentiana
"Illaenus americanus" = Thaleops laurentiana Amati and Westrop 2004 trilobite | |
|
Achatella achates Billings 1860 trilobite | |
"Flexicalymene senaria" = Flexicalymene (Flexicalymene) senaria
"Flexicalymene senaria" = Flexicalymene (Flexicalymene) senaria Conrad 1841 trilobite | |
| Crinoidea | |
|
Reteocrinus sp. Billings 1859 Sea lily | |
| Scyphozoa | |
|
Conularia trentonensis jellyfish | |
| Anthozoa | |
|
Streptelasma corniculum Hall 1847 horn coral | |