The Stratigraphy and Palaeontology of the Upper Cretaceous Rocks of Vancouver Island, British Columbia PDF Download
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Author: John Leslie Usher
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
"The present investigation is concerned primarily with a detailed faunal study of the Nanaimo series of Upper Cretaceous age along the east coast of Vancouver Island, British Columbia. The underlying purpose is three-fold: (1) to supplement and aid the stratigraphical, structural and economical studies of the group which are being carried on by the Geological Survey of Canada; (2) to so re-describe and re-illustrate the faunas that they might be more readily identifiable in other localities; (3) to fix more precisely than heretofore their stratigraphic and chronologic position. ..."--
Author: John Leslie Usher
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
"The present investigation is concerned primarily with a detailed faunal study of the Nanaimo series of Upper Cretaceous age along the east coast of Vancouver Island, British Columbia. The underlying purpose is three-fold: (1) to supplement and aid the stratigraphical, structural and economical studies of the group which are being carried on by the Geological Survey of Canada; (2) to so re-describe and re-illustrate the faunas that they might be more readily identifiable in other localities; (3) to fix more precisely than heretofore their stratigraphic and chronologic position. ..."--
Author: John Leslie Usher
Publisher:
ISBN:
Category : Ammonoidea
Languages : en
Pages : 734
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Book Description
"The present investigation is concerned primarily with a detailed faunal study of the Nanaimo series of Upper Cretaceous age along the east coast of Vancouver Island, British Columbia. The underlying purpose is three-fold: (1) to supplement and aid the stratigraphical, structural and economical studies of the group which are being carried on by the Geological Survey of Canada; (2) to so re-describe and re-illustrate the faunas that they might be more readily identifiable in other localities; (3) to fix more precisely than heretofore their stratigraphic and chronologic position. [...]" --
Author: Jan Engelbert Muller
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 90
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Book Description
Author: Jon Park Hudson
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 278
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Book Description
The bedrock of North and South Pender Islands, the southernmost islands of British Columbia's Gulf Islands chain, is formed entirely by six formations of the Late Cretaceous Nanaimo Group. These six formations are, from oldest to youngest, the Extens ion- Protection, Cedar District, DeCourcy, Northumberland, Geoffrey, and Spray Formations, A composite section of maximum thicknesses for these formations totals approximately 11,600 feet. The formations, however, vary in thickness significantly along strike. These formations represent four cycles of deltaic progradation, the youngest and oldest of which are incompletely exposed. The Extension-Protection Formation is considered to be the upper part of a west- to northwest-prograding delta complex, the lower part of which is not exposed within the thesis area, The fluvial conglomerates of the Extension-Protection Formation, inferred to be topset beds, are overlain on South Pender Island by an interval of shallow marine arkosic and ljthic sandstones, This shallow marine interval pinches out to the northwest and is absent on North Fender Island. The mineralogy of the conglomerates and sandstones suggests that the ExtensionProtection Formation was derived from the pre- Cretaceous rocks of Vancouver Island. The Extension-Protection Formation intertongues with and grades into the Cedar District /DeCourcy delta. Prodelta muds of the lower Cedar District Formation are overlain by distal bar turbidites. The turbid ite deposits are conformably overlain by arkosic delta-front sheet sands or river mouth bars of the lower DeCourcy Formation. Continued basin subsidence, possibly combined with lower sedirnentation rates, caused a transgression over the lower DeCourcy Formation and a return to prodelta deposition of the upper Cedar District Formation. The upper Cedar District and upper DeCourcy Formations follow a depositional cycle similar to that of the lower Cedar District and lower DeCourcy Formations, with the exception that fluvial conglomerates inferred to be topset beds intertongue with and overlie the shallow marine delta-front sheet sands or river mouth bars. Paleocurrent data, lateral thinning and facies changes, and mineralogy suggest that the Cedar District/DeCourcy delta sediments were derived from a source, to the northwest on Vancouver Is land, which was composed of the Vancouver Group and the Island Intrusions. The vertical succession of prodelta muds, distal bar turbidites, . delta-front sheet sands or river mouth bars, and fluvial conglomerates is the same for the Northumberland/Geoffrey deltaic cycle as for the upper Cedar District /DeCourcy deltaic cycle. Paleocurrent data, lateral thinning and facies changes, and mineralogy suggest that the Northumberland/Geoffrey delta sediments were derived from a source area to the northwest, which was either the same source area as that of the Cedar District /DeCourcy delta, or one similar to it, The Spray Formation, the lower part of the youngest deltaic cycle exposed in the thesis area, consists of distal bar turbidites. The Northumberland/Geoffrey delta intertongues with the Spray Formation, although this intertonguing may be related to the overlying Gabriola Formation, At least three episodes of faulting have deformed the rocks of North and South Pender Islands, forming the Kulleet Syncline and other subordinate folds, The major faults trend west-northwest, with minor faults trending northwest to northeast.
Author: Rolf Ludvigsen
Publisher: UBC Press
ISBN: 0774841516
Category : Nature
Languages : en
Pages : 322
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Book Description
Life in Stone is the first book to focus on British Columbia's fossils. Each of its chapters is written by a specialist for a general audience, and each is devoted to a separate fossil group that is particularly well represented in the province. Richly illustrated with photographs and drawings, Life in Stone will provide fascinating reading for anyone interested in learning more about the animals and plants that inhabited British Columbia during prehistoric times.
Author: Jan Engelbert Muller
Publisher:
ISBN:
Category :
Languages : en
Pages : 77
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Book Description
Author: Colin Hayter Crickmay
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 326
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Book Description
Author: John Alden Packard
Publisher:
ISBN:
Category : Paleontology
Languages : en
Pages : 202
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Book Description
Late Cretaceous sedimentary marine and deltaic rocks of Gabriola Island were mapped and studied during the summer of 1971. Cretaceous strata constitute all the exposed outcrops on the island, which is the northernmost of the Gulf Island chain of British Columbia. The upper four formations of the Nanaimo Group are recognized, totalling 2707 feet in composite section, The thinly laminated marine mudstones and siltstones of the Northumberland and Spray Formations are separated by deltaic sandstones and conglomerates of the Geoffrey Sandstone. The younger Gabriola Sandstone lacks the conglomerate units. Although unconformities between the formations may exist on a regional basis, locally the major contacts are sharp and planar. The marine strata are characterized by fine-grained, thinly laminated beds, and an abundant ammonite fauna, indicative of a low energy, open marine environment. The deltaic units are mediumto coarse-grained arkosic wackes and pebble-cobble conglomerates representing a nearby source, and a high energy, nearshore environment in which little sediment reworking occurred and burial was rapid. The minerals and lithic clasts of the deltaic units exhibit practically no variation throughout the sections. Source areas are considered to be the older formations on Vancouver Island. Channel axis measurements of festoon trough cross-bedding, plus orientation of sole marks and parting lineations, indicate a predominant northwest current transport direction for the upper two formations. Soft-sediment slumping and flame structures support the probability of a northerly to northwesterly declining paleoslope. The Cretaceous sequence forms the broad, open, east trending Gabriola syncline. Intersecting the axis of the syncline on the north end of the island is the tight, asymmetrical, northeast-trending Lock Bay anticline. Northwest-trending vertical faults occur parallel to the axis of the Gabriola syncline. Cross-cutting the syncline axis at both ends of the island are northeast-trending vertical faults. Except for that involving the steep limb of the Lock Bay anticline, no folding of the strata was observed. Although further work is needed, it is postulated that the Sp-ay Formation marks the end of basinal downwarping of the Georgia Seaway and the Gabriola Sandstone marks the close of Cretaceous tectonic activity within the coastal ranges of Vancouver Island.
Author: B. E. B. Cameron
Publisher:
ISBN:
Category : Foraminifera, Fossil
Languages : en
Pages : 36
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Book Description
The best exposures of early Tertiary rocks on the west coast of Canada occur in the Nootka Sound area of Vancouver Island. A detailed study of these rocks was undertaken to understand the depositional and tectonic framework of readily accessible parts of the Tofino Basin.
Author: Walter Andrew Bell
Publisher:
ISBN:
Category :
Languages : en
Pages :
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