CENTRAL STABLE REGION OF THE UNITED STATES 



59 



TERTIARY 



CRETACEOUS 



JURASSIC 



TRIASSIC 



PERMO-PENNSYL 



MISSISSIPPIAN 



DEVONIAN 



ORDOVICIAN 



PRECAMBRIAN 



Pliocene 



Miocene 



Oligocene 



Eocene 



Paleocene 



■!■■*■ *»^ ^ i H 'Nw^t ^jlll M W ^I%,U W ll^' 



Upper 



Lower 



Upper 



Middle 



Lower 



Upper 



Middle 



Lower 



inn 



Upper 

 Lower 



Upper 



Middle 

 Lower 



Upper 



Middle 



Lower 



Upper 



Middle 



Lower 



Upper 



Middle 



Lower 



Front Range 

 and Foothills 



Paskapoo 



Edmonton 

 Belly River 



Wapiabi 



Bighorn (Cardium) 



Blackstone 



Blairmore 



Upper Kootenay 



Lower Kootenay 

 Fernie 



Spray River 



3SC L-l— L-l— l-i.-l. 



Rocky Mountain 



■^I^O^^^-l^^^.i^^U^M-^1' 



Rundle 

 Banff 



Exshaw 

 Palliser 

 Fairholme 

 Ghost River ? 



[Ghost River ?] 



Cathedral 



Late Proterozoic 

 sediments 



Central and 

 Southern Plains 



Cypress Hills 

 Swift Current 

 Ravenscrag 



I \ i i_ [ .i 



Edmonton 

 Bearpaw 

 Pale Beds 

 Foremost 

 Pakowki 

 Milk River 



Lea 

 Park 



Alberta (Colorado) 



Blackleaf (Viking) 

 member (Bow Id.) 

 Blairmore 



Ellis group 



Madison group 



Exshaw 



Wabamun ( Pot i atch ) 



Wmterburn (Jefferaon) 



Woodbend 



Beaverhill (Waterways) 



Elk Point (upper) 

 (part) 



Elk Point 



(lower) 

 (part) 



Upper Cambrian 



Southeastern 

 Plains 



Wood Mountain 



Turtle Mountain 



J>i i!«m' h L iJ ■ L i» k J ■ 



Boissevain 

 Riding Mountain 



Boyne 



Morden 



Favel 



Ashville 



Swan River 



Jl.l.l.1.1 1 



Morrison ? 

 Sundance 

 Gypsum Springs 

 (Amaranth ? ) 



Charles 

 Madison 

 Kinderhook 



Exshaw 



Lyleton 



Jefferson 



Manitoban 

 Winnipegosan 

 Elm Point 



group 



Stonewall 



Stony Mountain 

 Red River 

 Winnipeg 



Chiefly Archean Intrusives and 

 met amorphics 



Fig. 5.20. Generalized correlation chart of western Canada basin, southern part, after Webb, 

 1954. 



Fig. 5.21. Devonian correlation chart of the Williston and Alberta basins. Reproduced from 

 Boillie, 1955. 



near Calgary. There, a fairly thick succession representing Lower, Mid- 

 dle, and Upper Jurassic occurs. Over the Sweetgrass arch (Fig. 

 5.19G) only a thin marine sequence of shales and sandstones of Middle 

 and Upper Jurassic beds is present. These rest on an irregularly eroded 

 surface of the Mississippian. Peterson (1957) traces the depositional 

 history of western Montana, and for the intermittently positive area 

 where thinning and overlap occurred he uses the term Belt Island, but 

 explains that it was rarely emergent and then only in small areas. It had 

 been emergent in early Jurassic time and probably furnished some of 

 the clastic material for the adjacent Middle Jurassic formations. See 

 chart, Fig. 5.23. Another area that tended toward shoal conditions during 

 parts of mid- and late Jurassic time, although not emergent, was the 

 Sheridan arch. Middle and Upper Jurassic beds are widespread over the 

 Williston basin and define it in about the position of the older Mis- 

 sissippian basin but centered somewhat south of the Devonian basin. 



