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http://hdl.handle.net/11375/5828
Title: | Sedimentology of the Upper Crataceous (Turonian) Cardium Formation in Outcrop in Southern Alberta |
Authors: | Duke, Lewis William |
Advisor: | Walker, R. G. |
Department: | Geology |
Keywords: | Geology;Geology |
Publication Date: | Jun-1985 |
Abstract: | <p>Cardium Formation exposures in Alberta consist of vertically juxtaposed thickening- and coarsening-upward cycles. Shallow-marine deposits exhibiting hummocky cross-stratification (HCS) dominate cycles. Locally, cycles record a marine to non-marine transition; they are interpreted as the deposits of a prograding storm-dominated shoreline. Sands were introduced into the basin by storms, and were transported in the proximal offshore region by seostrophically balanced bottom flows. Sharp contacts between cycles represent transgression surfaces; they display erosionally based, laterally extensive marine conglomerates. Locally, erosional transgressions removed non-marine deposits from the cycle tops over extensive distances normal to shoreline. Conglomerates were transported during transgressions, accumulating within a "hydrodynamic shadow" over the drowned shoreface of the preceding regressive episode.</p> <p>A technique for paleohydraulic analysis of conglomeratic symmetrical ripples has been discussed, tested, and applied to Cardium occurrences; results suggest that associated examples of HCS were formed in the oscillatory-flow flat-bed field by previously unrecognized low-amplitude, three-dimensional orbital ripples.</p> |
URI: | http://hdl.handle.net/11375/5828 |
Identifier: | opendissertations/1176 2524 1306477 |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Size | Format | |
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fulltext.pdf | 24.07 MB | Adobe PDF | View/Open |
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