This paper describes the Mississippian. Exshaw, Banff and Rundle units, a remnant of ? Pennsylvania strata and cherty sandstones of the Permian Ishbel Group; paleontological details include information on the megafossils, foraminifers and algae.
The Exshaw Formation includes a sanidine bearing tuffaceous sandstone.
The Banff was subdivided into four rock units - Basal Shale, Cherty Unit, Crinoidal Unit and Upper Unit. The Rundle Group was divided into the Pekisko, Shunda, Turner Valley and Mount Head Formations. The term Jasper Lake Formation is applied to a sequence of crinoidal biosparites and dolomites at the South Berland River section which are bank-marginal lateral equivalents of eastern Shunda micrites.
The Mississippian rocks of the three stratigraphic sections upon which this study is based are assigned to eight main petrographic facies and six petrographic subfacies.
Facies A - calcisiltite: argillaceous crinoidal biomicrite and associated calcareous shales
Facies B - an interbedded sequence offacies A and B
Facies C - calcarenite: argillaceous crinoidal biomicrite
Facies D - calcarenites: crinoidal biosparite
Subfacies Da - calcarenite: ‘mature’ crinoidal intrasparite
Subfacies Db - calcarenite: intraclast bearing crinoidal biosparite
Facies E - oolitic and/or grapestone bearing calcarenites
Subfacies Ea - fossiliferous intraclast bearing oosparite
Subfacies Eb - intrasparites and sparry intramierites; four lithotypes are recognized
(1) oolitic micritic crinoidal intrasparite
(2) grapestone bearing intrasparite
(3) oolite bearing partially merged intrasparite
(4) grapestone and oolite bearing, sparry intramicrite
Facies F - pure limestone micrites
Subfacies Fa - crinoidal micrite
Subfacies Fb - micrites, pelsparites, pelmicrites and dismicrites
Facies G - unfossiliferous micrograined dolomite, commonly with microbedding
Facies H - dolomite breccias
The progression through the facies and subfacies from A to H reflects a change in depositional environment from that of normal marine deep quiet waters to lagoonal and evaporitic conditions; modern sedimentation of the Bahama Banks is used as a partial model.
The facies distribution pattern for the Rundle carbonates of the area shows a tendency toward lagoonal facies in the east (Mturtm Creek section), bank-marginal facies in the west (South Berland River section) and intermediate facies at the Eagles Nest Pass section. / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate
| Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/36815 |
| Date | January 1966 |
| Creators | Dawson, Robin Humphrey |
| Publisher | University of British Columbia |
| Source Sets | University of British Columbia |
| Language | English |
| Detected Language | English |
| Type | Text, Thesis/Dissertation |
| Rights | For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
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