Ancona Point (S9), Lot 12, Lake Simcoe Area (Ordovician of Canada)

Where: Ontario, Canada (44.5° N, 78.6° W: paleocoordinates 25.1° S, 54.7° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Corynoides americanus - Orthograptus ruedemanni graptolite zone, Lower Member (Verulam Formation), Chatfieldian (460.9 - 449.5 Ma)

• M5 - M6

• member-level stratigraphic resolution

Environment/lithology: deep subtidal; gray, argillaceous limestone and green shale

• "170 feet of grey and brownish grey, fine- and medium-grained, argillaceous and sublithographic limestone; and higher in the formation, 8- to 10-inch beds of grey, medium-crystalline, crinoidal limestone alternating with 2- to 3-foot beds of greenish grey shale. Most of the strata weather to thin, 1- to 2-inch beds and to a buff and rusty colour. The lowermost 10 to 30 feet are non-resistant and consist of an alternation of grey and brownish grey, fine-grained, argillaceous limestone and thin, 1-inch greenish shale partings."

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 26268: authorized by Steven Holland, entered by Tori Hanson on 10.10.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Phacopida - Pterygometopidae
"Calliops callicephalus" = Calyptaulax callicephala, "Calliops narrawayi" = Calyptaulax
"Calliops callicephalus" = Calyptaulax callicephala Hall 1847 trilobite
"Calliops narrawayi" = Calyptaulax trilobite
 Phacopida - Calymenidae
Flexicalymene senaria Conrad 1841 trilobite
 Asaphida - Asaphidae
Isotelus gigas Dekay 1824 trilobite
Strophomenata
 Strophomenida - Sowerbyellidae
"Sowerbyella sericea" = Sowerbyella (Sowerbyella) sericea, "Sowerbyella cf. curdsvillensis" = Sowerbyella curdsvillensis, "Sowerbyella punctostriata" = Sowerbyella curdsvillensis
"Sowerbyella sericea" = Sowerbyella (Sowerbyella) sericea Sowerby 1839
"Sowerbyella cf. curdsvillensis" = Sowerbyella curdsvillensis Foerste 1912
"Sowerbyella punctostriata" = Sowerbyella curdsvillensis Foerste 1912
 Strophomenida - Rafinesquinidae
Rafinesquina alternata Conrad 1838
Rafinesquina alternata and Rafinesquina alternata plana
Rhynchonellata
 Atrypida - Anazygidae
"Zygospira recurvirostris" = Anazyga recurvirostra, Zygospira deflecta
"Zygospira recurvirostris" = Anazyga recurvirostra Hall 1847
Zygospira deflecta Hall 1847
 Rhynchonellida - Rhynchotrematidae
 Orthida - Dalmanellidae
Paucicrura rogata Sardeson 1897
 Orthida - Plaesiomyidae
"Dinorthis cf. iphigenia" = Plaesiomys iphigenia, Dinorthis pectinella
"Dinorthis cf. iphigenia" = Plaesiomys iphigenia Billings 1865
Dinorthis pectinella Emmons 1842
 Orthida - Platystrophiidae
Brachiopoda
 Inarticulata -
Lingulata
 Lingulida - Obolidae
"Lingula trentonensis" = Lingula (Palaeoglossa) trentonensis
"Lingula trentonensis" = Lingula (Palaeoglossa) trentonensis Conrad 1842
 Lingulida - Lingulidae
Lingula sp. BruguiƩre 1797
Bivalvia
 Modiomorphida - Modiomorphidae
Modiolopsis sp. Hall 1847 clam
Gastropoda
 Bellerophontida - Temnodiscidae
"? Tropidodiscus disculus" = Alaskadiscus disculus
"? Tropidodiscus disculus" = Alaskadiscus disculus Billings 1860 snail
 Murchisoniina - Loxonematidae
"Hormotoma trentonensis" = Omospira trentonensis
"Hormotoma trentonensis" = Omospira trentonensis Ulrich and Scofield 1897 snail
Cephalopoda
 Orthocerida - Orthoceratidae
"Orthoceras" sp. Breynius 1832
Stenolaemata
 Trepostomida -
 Trepostomata - Halloporidae
 Trepostomata - Mesotrypidae
Mesotrypa angularis
Mesotrypa angularis parvatrypa
 Trepostomata - Monticuliporidae
Prasopora simulatrix
Prasopora simulatrix and Prasopora simulatrix orientalis
 Trepostomata - Trematoporidae
Eridotrypa aedilis Eichwald 1855