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- W2291162705 abstract "ABSTRACT A biostratigraphic study of the core from 5200-5300 feet of Gulf Rumsey No. 6-30 well, in Lsd. 6, Sec. 30, Twp. 33, Rge. 20 W. 4 Mer., revealed the presence of 5 faunules of which the highest, in basal Banff black shale, bears Angustidontus seriatus Cooper, Spathiocaris, Dawson, etc. suggesting correlation with the Oklahoma Woodford and related black shales in Ohio and Kentucky. The underlying Exshaw shale (5225-5250 feet) has a rich conodont fauna of primarly upper New Albany affinites in its basal 5 feet, with scolecodonts, Sporangites, goniatites and Pseudestheria more generally distributed. The faunule in the top 3 feet of the Big Valley limestone, immediately beneath the Exshaw, is characterized by Strophopleura cf. notabilis Kindle, Cyrtiopsis cf. kindlei (Stainbrook) and Cleiothyridina coloradoensis (Girty), species which occur in the top of the Alberta Costigan as well as in the Ouray and Percha shales of Colorado and New Mexico. The underlying, shalier, 20 feet of Big Valley in richly fossiliferous and bears a brachiopod faunule linking it with the Costigan, Three Forks, Ouray, Percha, and the late Chautauquan generally. Athyris angelica is the most widespread of the zone fossils. In shalier portions, abundant Sporangites huronensis and the Exshaw scolecodonts occur, suggesting close time affinity of Big Valley and Exshaw, and the possibility of intertonguing. The faunule at 5291-5294 feet, from the Big Valley base, contains Spirifer zantedeschi Crickmay, thus establishing the true position of that species and its associated S. eudoxus, which Crickmay (1952) considered as indicating a Mississippian age for part of the D-1 unit. The first four faunules display a succession previously established for North America, and indicate that any apparent unconformity between Wabamun and Exshaw is timewise, negligible. Environmentally, progression upward is from marine neritic through littoral and saline-euxinic-lagoonal to fresh-euxinic-lagoonal. There are writers who would consider all of the five zones as Devonian and others who would consider all of them Mississippian. Studies in type regions of America and Europe are as yet inadequate to permit positive establishment of any systemic boundary in Alberta. It is important to recognize that here deposition from Devonian to Mississippian was essentially continuous." @default.
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- W2291162705 date "1956-01-01" @default.
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- W2291162705 title "Late Devonian and/or Mississippian Faunal Sucession in Stettler Area, Alberta" @default.
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