Stratigraphy and Depositional History of the Cretaceous Nanaimo Group of the Chemainus Area, British Columbia PDF Download
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Author: Beverly Edlyn Fahlstrom
Publisher:
ISBN:
Category : Geology, Stratigraphic
Languages : en
Pages : 230
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Author: Beverly Edlyn Fahlstrom
Publisher:
ISBN:
Category : Geology, Stratigraphic
Languages : en
Pages : 230
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Book Description
Author: Jan Engelbert Muller
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 90
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Author: William Bruce Hanson
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 678
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Author: William F. Ruddiman
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 222
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Book Description
The western part of the Late Cretaceous Nanaimo Basin is exposed on Vancouver Island at Nanaimo, British Columbia. The five lowest members of the Nanaimo Group are present and represent a complete sedimentary cycle. The two lowest formations, the Comox and Haslam, represent the marine part of the cycle. The Comox rests with angular unconformity on the underlying Triassic Karmutsen volcanics, and is composed of shallow marine deposits of sandstones, conglomerates and limestones, one of the limestones being an algal type not previously reported for the Nanaimo Basin. The Haslam represents a quiet marine environment, possibly lagoonal, which grades upward into a swampy environment represented within the lower Extension Formation. The Extension Formation represents the first of the terrestrial part of the cycle. Above the Wellington Coal Member, deposited in a swampy environment, lie channel conglomerates and sandstones indicative of a braided stream environment. The Newcastle Formation onlaps the Extension Formation and is composed of sandstones, siltstones, conglomerates, and the Newcastle and Douglas Coal Seams. The environments of deposition of the Newcastle Formation are postulated to be the upper floodplain of a short headed stream. Paleocurrent data and composition of the rocks indicate sources to the west. The Protection Formation is the uppermost of the formations in the area, and is composed of thick- and thin-bedded sandstones. The sandstones indicate a barrier-beach complex, probably deposited as the paleo-shoreline migrated west during a transgression. Subsequent faulting, and fluvial and glacial erosion produced the present topography of the area.
Author: Jan Engelbert Muller
Publisher:
ISBN:
Category :
Languages : en
Pages : 77
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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: Joan Marian Allmaras
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 356
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Author: Douglas A. Fiske
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 350
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Author: Walter Andrew Bell
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ISBN:
Category :
Languages : en
Pages :
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Author: Patrick David Johnstone
Publisher:
ISBN: 9780494294611
Category :
Languages : en
Pages : 325
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Book Description
Keywords. Nanaimo Group, Upper Cretaceous, Comox Formation, Haslam Formation, Extension Formation.
