. Bulletins of American paleontology. Elk Point Grp. / Yatlatinda Fm. ,,, â . ' ^ .., . «.!. ^ . .. WattMtn. Fm. West A beila Arch Texl-tigure 2.âUpper Devonian strallgraphic nomenclature tor the Rocky Mountains, western Alberta and the central Alberta sub- surface (after Switzer ei 1994). The Thornton Creek Member of the Flume Formation in the Alberta Rocky Mountains is equivalent to the basal Waterways Formation in the central Alberta subsurface ( = Lower T-R cycle A of Wendte ft al., 1995. and L'yeno and Wendte, this volume). to fine-sandstone of indeteiminate age that overlays finely
. Bulletins of American paleontology. Elk Point Grp. / Yatlatinda Fm. ,,, â . ' ^ .., . «.!. ^ . .. WattMtn. Fm. West A beila Arch Texl-tigure 2.âUpper Devonian strallgraphic nomenclature tor the Rocky Mountains, western Alberta and the central Alberta sub- surface (after Switzer ei 1994). The Thornton Creek Member of the Flume Formation in the Alberta Rocky Mountains is equivalent to the basal Waterways Formation in the central Alberta subsurface ( = Lower T-R cycle A of Wendte ft al., 1995. and L'yeno and Wendte, this volume). to fine-sandstone of indeteiminate age that overlays finely laminated Upper Cambrian dolomitic mudstones of the Formation (Te.\t-tigs. 4 and 5; Aitken. 1966). The contact between the Devonian and older Paleozoic rocks, locally a disconformity, is regionally an angular unconformity with progressively younger Paleozoic rocks underlying Devonian rocks to the east and west of the West Alberta Arch (McLaren. 1953; Pugh. 1973). Facies Three major lithofacies comprise the Thornton Creek Member at its type section (Text-ttgs. 3, 4 and 5). These are: 1) laminated to buiTowed argillaceous dolo-mudstone and calcareous shale. 2) fossiliferous, bioturbated. quartzose (silty to sandy) dolo-mud/wack/ packstones, and 3) dolomitic sandstones (Text-figs. 4 and 5). The laminated to burrowed argillaceous dolo- mudstone and calcareous shale are dark gray to dark brown, laminated to thin bedded, dominantly unfossil- SE Thornton Creek -<^.0 km^ SE Mt. Haultain 1 0 6 km [ Haultain Cirque Hâ 0 35 km G -+0 20 km-f 020km-|â 0 25 kmH Q O 0/F F/P Type Section Thornton Cr Mbf Basal to m. (Q 7 E 4SO S5 ^^1 M Fl U K*fl ^ -400 n < 3 SO 5 SI ^^a JC o 0) B £ 2so^lH 200 c ISO 3 (3 mo^^l â 0) B E .... 1^ a o â Ul f-^ Background Facies and Fine-grained Slope/Basin liJ Redeposited Facies. Sequences 3, 5, 7 Facias IâI Background Facies and Fine-grained 'â' Redeposited Facies, Sequences 4, 6, 8 era Conglomerates and Breccias PlaHnrm/ ZZ Sequence 1 ^-^
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