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- W2262850045 abstract "Marine and brackish water sandstones and shales of the Bluesky Fonnation (Early Cretaceous) overlie continental, fluvial deposits of the Gething Fonnation and are overlain by deep marine shales of the Wilrich Fonnation. Three transgressive surfaces and at least two prograding shoreface sequences are present within the study area. The base of the Bluesky Fonnation is an irregular transgressive surface that has reworked sediment to the first coal but is strongly influenced by the Gething paleotopography. This transgressive event resulted in deposition in a tidally-influenced, marginal marine environment, followed by deposition of a lower shoreface sequence. The second transgressive surface on the top of this lower shoreface sequence is marked in core by a pebble lag, overlain by heterolithic sandstone and shale. It is possible either that this transgressive event reworked only the top of the lower shore face sequence or that a drop in sea-level occurred before the transgressive event, thereby resulting in erosion of the upper shore face and foreshore sequence with subsequent deposition of a pebble lag as this surface was transgressed. The third transgressive surface marks the top of the Bluesky Fonnation and occurs at the top of the second prograding shoreface sequence. It is characterized by a glauconite-rich layer overlain by deep marine shales. This last regional transgressive surface was associated with a major rise in sea-level and is a useful datum for stratigraphic cross sections." @default.
- W2262850045 created "2016-06-24" @default.
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- W2262850045 date "1991-01-01" @default.
- W2262850045 modified "2023-09-23" @default.
- W2262850045 title "Abstract: Vertical stratigraphic sequence of the Bluesky Formation in west-central Alberta and implications for a depositional model" @default.
- W2262850045 hasPublicationYear "1991" @default.
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