Section 12, sample 480 (Ordovician to of Canada)

Where: Nunavut, Canada (76.3° N, 95.3° W: paleocoordinates 3.6° N, 32.0° W)

• coordinate estimated from map

When: Pterospathodus pennatus procerus Local-Range Zone conodont zone, Cape Phillips Formation, Ashgill to Ashgill (449.5 - 412.3 Ma)

Environment/lithology: lithified, black, calcareous shale

• The Cape Phillips Formation was introduced by Thorsteinsson (1958) for a sequence of dark grey to black shale, calcareous shale, and minor argillaceous limestone, representing a graptolitic basin facies, with its type section located at Cape Phillips, northeastern Cornwallis Island. It was estimated to be about 3000 m thick (Thorsteinsson and Kerr 1968) and was divided into three members (Thorsteinsson 1958). The lower, Member A, comprises mainly dolostone, argillaceous limestone, fetid shale, and cherty argillaceous limestone. The middle, Member B, conformably overlies Member A and is composed mainly of cherty argillaceous limestone, argillaceous limestone, cherty calcareous shale, and calcareous shale. The upper, Member C, consists of an extremely monotonous succession of alternating calcareous shale, argillaceous limestone, limestone, and shale. Member C accounts for roughly three-quarters of the formation’s total thickness. Based on graptolite biostratigraphy, the formation was assigned a Middle Ordovician to Late Silurian age (Thorsteinsson 1958), and later modified to Late Ordovician (Ashgill) to Early Devonian (Gedinnian) (Kerr 1976; Mayr et al. 1998). More precise correlations were made by Melchin (1989), in which Members A, B, and C ranged from Late Ordovician to middle Llandovery, early to latest Telychian, and latest Telychian to Ludlow, respectively.

Size class: microfossils

Primary reference: S. Zhang, K. Mirza, and C. R. Barnes. 2016. Upper Ordovician – Upper Silurian conodont biostratigraphy, Devon Island and southern Ellesmere Island, Canadian Arctic Islands, with implications for regional stratigraphy, eustasy, and thermal maturation. Canadian Journal of Earth Sciences 53(9):931-949 [E. Jarochowska/S. Haegele]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 188176: authorized by Emilia Jarochowska, entered by Sarah Haegele on 24.08.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

Conodonta
 Panderodontida - Panderodontidae
Panderodus unicostatus Branson and Mehl 1933 conodont
 Ozarkodinida - Spathognathodontodae
Wurmiella excavata Branson and Mehl 1933 conodont
Subspecies"Wurmiella excavata excavata"
 Prioniodontida - Balognathidae
Pterospathodus pennatus Walliser 1964 conodont
Subspecies"Pterospathodus pennatus procerus"
  - Strachanognathidae
Pseudooneotodus beckmanni Bischoff and Sannemann 1958 conodont