T3, Peel River Rapids, Lower Limestone Unit (Carboniferous to of Canada)

Where: Yukon, Canada (65.9° N, 136.2° W: paleocoordinates 31.7° N, 25.7° W)

• coordinate stated in text

• basin-level geographic resolution

When: Middle Pennsylvanian to Middle Pennsylvanian (314.6 - 298.9 Ma)

• The Permo-Pennsylvanian in the northern Yukon is ideally divided into three units called, in ascending order: Lower Limestone unit, Middle Recessive unit, and Tahkandit Formation (Nelson, 1961a, b, 1962b). It doesn't appear that the Lower Limestone unit and the Middle Recessive unit are formations or members and therefore the two units are treated as a bed/horizon.

Environment/lithology: marine; silty limestone

• Lithologies are from stratigraphic columns in Text-Fig. 2 of article.

Size classes: macrofossils, microfossils

Collection methods: Authors counted brachiopods only, but listed other taxa present. Fossils were collected from five horizons in the Lower Limestone unit, but the horizons are not labeled in Text-Fig. 2 or listed elsewhere in the article.

Primary reference: S. J. Nelson and C. E. Johnson. 1968. Permo-Pennsylvanian brachythyrid and horridonid brachiopods from the Yukon Territory, Canada. Journal of Paleontology 42(3):715-746 [T. Olszewski/L. Fall]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 61573: authorized by Tom Olszewski, entered by Leigh Fall on 20.06.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

Foraminifera
 Ammodiscoidea - Ammodiscidae
 Fusulinoidea - Ozawainellidae
Ozawainella sp. Thompson 1935
Strophomenata
 Productida - Echinoconchidae
"cf. Echinoconchus fasciatus" = Karavankina fasciata
"cf. Echinoconchus fasciatus" = Karavankina fasciata Kutorga 1844
Listed as Echinoconchus sp. cf. E. fasciatus
 Productida - Productidae
Bailliena yukonensis n. gen. n. sp.
Bailliena yukonensis n. gen. n. sp. Nelson and Johnson 1968
79 specimens
Rhynchonellata
 Spiriferida - Spiriferidae
"Spirifer nikitini" = Purdonella nikitini
"Spirifer nikitini" = Purdonella nikitini Tschernyschew 1902
 Spiriferida - Choristitidae