Geology of the Upper Cretaceous Nanaimo Group, Southernmost Gulf Islands and Adjacent Saanich Peninsula, Southwestern British Columbia PDF Download
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Author: Patrick D. Johnstone
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 0
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The Upper Cretaceous Nanaimo Group is a succession of siliciclastic marginal-marine and marine sediments in southwestern British Columbia. On the north tip of the Saanich Peninsula and several small, adjacent islands, the lowest three formations of the Nanaimo group are exposed. The basal unconformity is overlain by Comox Formation conglomerates and sandstones representing deposition along a high-relief, storm-swept shoreline open to the proto-Pacific Ocean. Fan-delta, strandplain-shoreface, and barrier-island complex deposits are preserved within this formation. The Haslam and Extension formations, representing mudstone-sandstone turbidites and conglomerate-sandstone submarine channel fills respectively, overlay the Comox Formation. The depositional history suggests slow, persistent transgression within a peripheral foreland basin, with sediment supplied by contemporaneous thrusts to the east. Nanaimo Group strata has been affected by at least two major deformation events. Evidence from the Eocene Cowichan Fold and Thrust System and the Neogene Gulf Island Thrust System is preserved within the study area.
Author: Patrick D. Johnstone
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 0
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Book Description
The Upper Cretaceous Nanaimo Group is a succession of siliciclastic marginal-marine and marine sediments in southwestern British Columbia. On the north tip of the Saanich Peninsula and several small, adjacent islands, the lowest three formations of the Nanaimo group are exposed. The basal unconformity is overlain by Comox Formation conglomerates and sandstones representing deposition along a high-relief, storm-swept shoreline open to the proto-Pacific Ocean. Fan-delta, strandplain-shoreface, and barrier-island complex deposits are preserved within this formation. The Haslam and Extension formations, representing mudstone-sandstone turbidites and conglomerate-sandstone submarine channel fills respectively, overlay the Comox Formation. The depositional history suggests slow, persistent transgression within a peripheral foreland basin, with sediment supplied by contemporaneous thrusts to the east. Nanaimo Group strata has been affected by at least two major deformation events. Evidence from the Eocene Cowichan Fold and Thrust System and the Neogene Gulf Island Thrust System is preserved within the study area.
Author: Patrick David Johnstone
Publisher:
ISBN: 9780494294611
Category :
Languages : en
Pages : 325
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Keywords. Nanaimo Group, Upper Cretaceous, Comox Formation, Haslam Formation, Extension Formation.
Author: Jan Engelbert Muller
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 90
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Author: Jan Engelbert Muller
Publisher:
ISBN:
Category :
Languages : en
Pages : 77
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![An Integrated Structural and Hydrogeologic Investigation of the Fracture System in the Upper Cretaceous Nanaimo Group, Southern Gulf Islands, British Columbia [microform] PDF](https://books.google.com/books/content/images/frontcover/zI7sXwAACAAJ?fife=w80-h100)
Author: Daniel C. (Daniel Carl) Mackie
Publisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN: 9780612818712
Category : Geology, Stratigraphic
Languages : en
Pages : 716
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Author: William Bruce Hanson
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 678
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![Sedimentology, Stratigraphy and Provenance of the Upper Cretaceous Nanaimo Group, Denman and Hornby Islands, British Columbia [microform] PDF](https://books.google.com/books/content/images/frontcover/2ykFywAACAAJ?fife=w80-h100)
Author: Deanne Christina Katnick
Publisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN: 9780612615700
Category : Geology
Languages : en
Pages : 530
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Author: Geological Survey of Canada
Publisher:
ISBN:
Category : Geology
Languages : en
Pages :
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Author: Roger Barton Stickney
Publisher:
ISBN:
Category : Geology, Stratigraphic
Languages : en
Pages : 452
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An ancient delta complex is partly recorded by the upper seven formations of the Cretaceous Nanaimo Group exposed on Mayne and Samuel Islands of southwestern British Columbia. Features especially suggestive of deltaic sedimentation here are: upward-coarsening marine to fluvial sequences, cyclic repetition of facies, subaqueous slumping, fluvial-marine interfingering, facies changes, lobate geometry, and variations in thickness along strike. Clastics were derived from a varied terrane of the Paleozoic and Mesozoic basement both on Vancouver Island and farther southeast in the San Juan Islands of Washington. These pre-Cretaceous rocks largely include chert, limestone, pyroclastics, granitics, and low-grade metamorphics. Swift, short-headed streams from nearby mountains to the east and south carried detritus to a subsiding marine embayment adjacent to the southeast coast of Vancouver Island. Locally on Mayne Island, the composite section is at least 8, 000 feet thick. The oldest unit, only partially exposed, is the Extension- Protection Formation, made up of interbedded conglomerates and arkosic sandstones. Interfingering with it is the largely superjacent Cedar District Formation comprising a recurrent, marine turbidite facies. It contains a molluscan fauna as is also known in the similar younger strata. Overlying it, the DeCourcy Formation, a second fluvial unit of sandstone to conglomerate, shows a lobate development ascribed to distributary switching. This is the top member of an upward-coarsening, marine to fluvial deltaic cycle. Immediately above, a nearly identical cycle begins with the Northumberland Formation, composed of repetitiously graded turbidites. Overlying them is the Geoffrey Formation, the final part of the second exposed deltaic cycle. Within it, sandstones enclose especially coarse conglomerates, suggesting a change from an easterly to a proximal southerly source. Marine encroachment followed which allowed deposition of the Spray Formation, the third exposed monotonous turbidite sequence. The next higher unit is the fluvial Gabriola Formation which terminated Nanaimo Group deposition and completed the final deltaic cycle. Its upper contact is not exposed. The study area lies on the north flank of the northwesterly trending Trincomali Anticline, which was folded during early Tertiary. Faults have offset this structure locally and at least two separate events are suggested.
Author: Joan Marian Allmaras
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 356
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