Stream on south side of Young Island (Devonian of Canada)

Where: Nunavut, Canada (74.3° N, 98.6° W: paleocoordinates 9.1° S, 22.8° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Polygnathus inversus conodont zone, Disappointment Bay Formation, Emsian (407.6 - 393.3 Ma)

• 7 m of strata exposed, with the ammonoid-bearing bed occurring 2 m above the base. Conodonts include Panderodus, Belodella, Pandorinella exigua exigua, Steptotaxis glenisteri, and a form of Polygnathus inversus transitional to P. serotinus (T. T. Uyeno, personal commun.), indicating placement in the upper part of the P. inversus Zone (Uyeno and Klapper, 1980; Klapper with Johnson, 1977; Klapper and Johnson, 1975). The Young Island beds are thus uppermost Zlichovian to lower Dalejan, or near the lower-upper Emsian boundary

• bed-level stratigraphic resolution

Environment/lithology: lithified, gray lime mudstone

• Dark gray, tentaculite-rich lime mudstone

Size class: macrofossils

Collected by E.C. Prosh in 1983, 1984; reposited in the GSC

Primary reference: E. C. Prosh. 1987. A Lower Devonian ammonoid, Mimagoniatites nearcticus n. sp., from the Canadian arctic. Journal of Paleontology 61:974-981 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 170992: authorized by Matthew Clapham, entered by Matthew Clapham on 29.06.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

 Productida - Chonetidae
? Devonochonetes sp. Muir-Wood 1962
 Spiriferida - Reticulariidae
 Lingulida - Disciniidae
Orbiculoidea sp. d'Orbigny 1847
 Lingulida - Lingulidae
"Lingula" sp. BruguiƩre 1797
 Cyrtodontida - Praecardiidae
Praecardium sp. Barrande 1881 clam
 Protobranchia - Solemyidae
"Solemya (Janeia) sp." = Janeia
"Solemya (Janeia) sp." = Janeia King 1850 Awning Clam
 Nowakiida - Nowakiidae
 Bactritida - Bactritidae
 Agoniatitida - Mimagoniatitidae
Mimagoniatites nearcticus n. sp. Prosh 1987 ammonite