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  • 1
    Book
    Book
    Enlgewood Cliffs, New Jersey : Prentice-Hall
    Keywords: Sedimentary rocks ; Sediment
    Type of Medium: Book
    Pages: XIX, 634 S , graph. Darst
    ISBN: 0136427022
    DDC: 552/.5
    RVK:
    RVK:
    Language: English
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  • 2
    Type of Medium: Book
    Pages: VI, 401 S , graph. Darst
    Edition: 2. ed
    Series Statement: Short Course / Society of Economic Paleontologists and Mineralogists 3
    Language: English
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  • 3
    Book
    Book
    Cambridge [u.a.] : Cambridge Univ. Press
    Keywords: Mechanics, Analytic ; Geodynamics ; Mechanics, Analytic ; Geodynamics ; Mechanics ; Geomechanik ; Geodynamik
    Type of Medium: Book
    Pages: XVI, 459 S , graph. Darst , 26 cm
    Edition: 1. publ.
    ISBN: 0521441242 , 0521446694
    DDC: 550.1531
    RVK:
    RVK:
    RVK:
    Language: English
    Note: Bibliography: p438-450. - Includes indexes
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 18 (1972), S. 0 
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The equation used by Skipper (1971) to derive flow velocity from antidune wavelength is satisfactory for open-channel conditions, but must be modified for antidunes formed by density currents. Calculations based on the modified equation indicate a much higher flow density than was originally proposed for antidunes of the Cloridorme Formation. It further appears that the water waves accompanying these particular antidunes developed not at the upper boundary of the turbidity current, but at a density discontinuity within a few centimeters of the bed. Textural features of the Cloridorme turbidites are compatible with this interpretation.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 14 (1970), S. 0 
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Longitudinal and vertical variation in grain orientation and size has been studied in eight turbidite greywacke beds from the Cloridorme Formation (Middle Ordovician), Gaspé, Quebec, Canada. The beds are exposed on a wave-cut platform near Grande Vallée, Gaspé. These beds were traced for about two miles along the strike (276°), which is almost parallel to the average current direction (274°) as indicated by sole marks.Agreement between grain orientation and other internal current-direction indicators such as graptolites and intra-bed lineation shows that grain fabric is primary in nature and that grains are typically aligned parallel to the current direction. Grain orientations are generally statistically non-significant in the upper massive part of the beds in the proximal region and significant in the rest of the beds. Most of the significant grain orientations are close to the sole direction in the proximal region and deviate from the sole direction by as much as 90° in the distal region. Grain orientations are increasingly divergent from the base towards the top of the bed. Current-normal grain orientations are observed in a plane-laminated part of a bed.The beds show a good grading in the proximal area and are ungraded or slightly reverse graded in the distal area. These grading characteristics are exhibited by both the mean and maximum grain size. Most beds show no appreciable variation in the mean grain size at the base of the bed along the strike. However, for one bed, the largest mean size at the base occurs in the middle of the outcrop and grain size decreases from this point both in the upstream and downstream directions.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The 40-km-long, Cobequid Bay—Salmon River estuary has a maximum tidal range of 16·3 m and experiences limited wave action. Sediment, which is derived primarily from areas seaward of the estuary, is accumulating faster than the high-tide elevation is rising, and the system is progradational. The deposits consist of an axial belt of sands, which is flanked by mudflats and salt marshes in the inner half of the estuary where a funnel-shaped geometry is developed, and by erosional or non-depositional foreshores in the outer half where the system is confined by the valley walls. The axial sands are divisible into three facies zones: zone 1—elongate, tidal sand bars at the seaward end; zone 2—sand flats with a braided channel pattern; zone 3—the inner, single-channel, tidal—fluvial transition. Tidal current speeds reach a maximum in zone 2, but grain sizes decrease headward (from medium and coarse sand in zone 1, to fine and very fine sand in zones 2 and 3) because the headward termination of the major flood channels prevents the coarse, traction population from entering the inner part of the estuary.Longitudinal progradation will produce a 20-m-thick, upward-fining succession, the lower 1/2–2/3 of which will consist of cross-bedded, medium to coarse sand deposited on the zone 1 sand bars. The ebb-dominated portion of this unit will be finer grained than the flood-dominated part, and will contain trough crossbedding produced by 3-D megaripples; the flood-dominated areas, by contrast, will consist mainly of compound cross-bedding created by sandwaves with superimposed megaripples. Headward migration of swatchways (oblique channels that link the ebb- and flood-dominated areas) will create packages of ebb cross-bedding that is orientated at a high angle to the long axis of the estuary and that contains headwardinclined, lateral-accretion surfaces. The overlying fine and very fine sands of zones 2 and 3 will be composed mainly of upper-flow-regime parallel lamination. The succession will be capped by a 4-m-thick unit of mixed flat, mudflat and salt marsh sediments. A review of other macrotidal estuaries with tidal ranges greater than 10 m suggests that the major elements of the model have general applicability.
    Type of Medium: Electronic Resource
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