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  • Articles  (10,302)
  • 1965-1969  (10,302)
  • 1968  (10,302)
  • Geosciences  (10,302)
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  • Articles  (10,302)
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  • 1965-1969  (10,302)
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Journal
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  • 1
    Electronic Resource
    Electronic Resource
    EDITORIAL (1968)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 11 (1968), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1968.tb00848.x
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  • 2
    Electronic Resource
    Electronic Resource
    TEXTURAL STUDIES OF GRADING: VOLCANIC ASH FALLS (1968)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 11 (1968), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A theory of the lateral decrease of grain size and bed thickness with increasing distance of downwind transport is developed for ash falls. The theory is based on: the sediment load density of a turbulent slug of fluid, a turbulent diffusitivity coefficient, and the decay of turbulent velocity fluctuations. All three factors are founded on empirical observation and are generally accepted as having widespread applicability to turbulent sediment-fluid mixtures. The theory yields good qualitative agreement with observational data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1968.tb00850.x
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  • 3
    Electronic Resource
    Electronic Resource
    WEATHERING AND ROUNDNESS OF QUARTZ SAND GRAINS (1968)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 11 (1968), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Photographs and descriptions of quartz sand grains from soils, paleosols and silcretes show that grain shape can be modified by solution in situ. Dissolution is attributed to solutions rich in organic molecules present in weathering profiles, and commonly results in rounding of protuberances and re-entrants on grains. The incidence of this process may vary with climate. It is postulated that solution rounding during weathering plays an important role in shaping quartz sand grains in general, its significance varying with climate. This postulate, which remains unconfirmed, has considerable implications for the interpretation of textural maturity of sandy sediments. If true, super-mature sands may be as much a climatic indicator as an indicator of tectonic quiesence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1968.tb00851.x
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  • 4
    Electronic Resource
    Electronic Resource
    INTRICATED CROSS-STRATIFICATION DUE TO INTERACTION OF A MEGA RIPPLE WITH ITS LEE-SIDE SYSTEM OF BACKFLOW RIPPLES (UPPER-POINTBAR DEPOSITS, LOWER RHINE) (1968)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 11 (1968), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Of the several uncommon types of large-scale cross-stratification encountered in Late Holocene upper-pointbar sandy deposits of the Rhine, one is examined in detail. This type is structurally bipartite as it consists of a relatively coarse-grained, upper interval of large-scale foresets, which indentate with the oppositely dipping small-scale foresets in the underlying finer interval. The lower interval is usually of smaller, and incidentally of the same thickness as the upper one. Together they constitute the so called “interwoven set”.The interwoven set is regarded as formed by a mega ripple (dune) with in front of it, a simultaneously active system of small-scale, oppositely moving, ripples propelled by the backflow branch of the mega ripple's lee-side vortex.Comparison of dip, strike, and principal bedding-plane (= horizontal) sections brought to light dissimilarity in the crestline orientations of the mega-ripple and backflow-ripple systems. The latter's oblique, or incidentally perpendicular orientation with respect to the mega-ripple front indicates a conspicious component of lateral water movement, which in the present outcrop was consistent from the left to the right, for the observer looking down(main)stream.It is suggested that this lateral water movement is due to the radial (transverse) flow in the bend of a meandering river. From the sense of the radial flow the river's bend configuration (here: right hand turn) can be inferred. Relative wander velocities of mega- and backflow-ripple systems were deduced from the configuration in a horizontal section made through the interaction zone of the two structural intervals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1968.tb00849.x
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  • 5
    Electronic Resource
    Electronic Resource
    AN OPTICAL METHOD OF MEASURING GRAIN ORIENTATION IN SEDIMENTS (1968)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 11 (1968), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A new method is presented for the measurement of grain orientation in clastic sediments.The method is based on the principle that when an inclined beam of light passes through an elliptical hole in a plate of a certain thickness, the amount of light passing through depends on the orientation of the long axis of the ellipse with respect to the direction of incidence of the light beam. If such a plate is rotated in its own plane, the amount of light passing through will fluctuate. Such fluctuations are larger the greater the eccentricity of the ellipse, the amount of light passed being maximal when the long axis coincides with the plane of incidence of the light.If the plate contains many holes, which need not be elliptical but for the ease of reasoning can be approximated by ellipses, their main orientation direction can be inferred from the maximum intensity of passed light.It is shown in the paper that results of a similar kind can be obtained by using a black and white picture of the grain packing in combination with a mirror. These pictures can be obtained either from thin-sections or from printed replicas of etched polished sections of impregnated samples.The resulting data represent an integrated orientation pattern instead of a long-axis distribution pattern as given by the grain-by-grain counting technique.The new method has been thoroughly checked against the visual counting method. Excellent agreement was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1968.tb00852.x
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  • 6
    Electronic Resource
    Electronic Resource
    PARTICLE SHAPE AND INFERENCE OF SIZE FROM SIEVING (1968)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 11 (1968), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Accurate particle-size measurement by sieving requires that consideration is given to particle shape and screen opening size variations. The effect of particle shape has been studied by determining experimentally the probability of passage through each of five woven-wire screens of 35 different mm-sized ellipsoids. These range in shape from T/D= 0.2 to 1.0 and from L/D= 1.125 to 2.625, where T is particle thickness, L is particle length, and D is particle intermediate diameter. Passage tests were performed for both static and dynamic conditions of sieving.A mathematical sieving theory stemming from the idea of particle passing probability is developed. The theory is put to use by computer-simulated sieving of idealized input samples of simple shape make-up. When near-spheres are sieved it is found that a bar-type histogram is a justifiable depiction. For some other more realistic shape inputs, what is obtained are broad, overlapping bell-shaped fraction distributions considerably offset from the nominal openings of the limiting screens. For these distributions, conventional representation in histogram form is incongruous.The treatment presented contains allowance for screen opening size variations. Some apparently polymodal distributions are probably explainable as a result of unsuspected differences between the screens used and an ideal screen series.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1968.tb00853.x
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  • 7
    Electronic Resource
    Electronic Resource
    X-RAY RADIOGRAPHY FOR EXAMINATION OF BURROWING IN SEDIMENTS BY MARINE INVERTEBRATE ORGANISMS (1968)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 11 (1968), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Examination of the primary sedimentary texture of rocks and sediments by X-radiography can be extended to include the study of bioturbation and burrowing by living organisms. This technique involves making time-lapse X-radiographs while the animals are in the process of disturbing the sediment.Artificially and naturally stratified sediments are contained in plexiglass aquaria connected to a continuously flowing seawater system. The burrowing animals to be studied are introduced into these aquaria and the effect of their activities on the sediments is recorded by X-radiography over a period of hours, days or weeks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1968.tb00855.x
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  • 8
    Electronic Resource
    Electronic Resource
    DIAGENETIC RE-CRYSTALLIZATION AND ORIENTATION OF TWO CARBONATE SPECIES (1968)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 11 (1968), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Results of X-ray textural studies of dolomite and the clay minerals in the Marl Slate and of siderite from the top of the Mansfield Marine Band are interpreted in terms of the possible diagenetic development of the re-crystallized carbonates in these two rocks. From computer processed (1014) fabrics of the two trigonal carbonates it is deduced that there is a c-axis preferred orientation concordant with the normal to the stratification. An early diagenesis in this oriented mode must be a function of both a threshold stress difference in a non-hydrostatic stress field (in effect a necessary minimum depth of burial) and also of the presence of connate solutions. The existance of a minor percentage of dolomite oriented with the rhomb faces parallel to the stratification probably reflects an even earlier crystallization within the top few metres of sediment, when the confining pressures and pressure differences were of insignificant amplitude. It is concluded that a higher rate of sedimentation associated with the Coal Measure sequence is responsible for the singular preferred orientation of the siderite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1968.tb00854.x
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  • 9
    Electronic Resource
    Electronic Resource
    STATISTISCHE METHODEN IN DER MIKRO-BIOFAZIES (1968)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 11 (1968), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Statistical methods in micro-biofacies This paper deals with statistical methods as applied to micro-biofacies problems. The samples for the tests were taken from four quarries in Jurassic and Cretaceous limestones in northwestern Germany. The calculations are based on acetate-peels. Two millions of figures were considered.The percentages of nine organic and nine inorganic components were calculated, hierarchically. In the beginning, the results were plotted as segments of circles. This way of representing the percentages of components just shows the general distribution of the main components.A more detailed picture can be given by plotting the distribution expressed in percentage, in reference to the distance of sampling points. The figures show the importance, not of the individual amplitudes, but of the average values of all amplitudes measured in one layer. Therefore, the change of the average amplitude represents a micro-biofacies change of the layer under consideration. The measurements have shown that the differences in the distribution of the organic and inorganic components within the individual layers are not greater than those between the single layers.Correlation-analyses had no positive results. Also tests of inhomogeneity did not give satisfying results. By decision-analyses (discriminance-analyses), however, it was possible to show small differences in the distribution of the components within the individual layers.Differentiations of the homogeneity and of the micro-biofacies setting can be demonstrated by the intersections of the curves of the decision factors (=discriminance factors) and of the values of the arithmetic mean and sliding mean. By applying the X2-test and/or variance-analyses, the boarder lines between fields of homogeneity can be shown accurately.Information about the homogeneity of the tested samples and the number of samples necessary for getting representative data, can be calculated from sequence tests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1968.tb00856.x
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  • 10
    Electronic Resource
    Electronic Resource
    DENDRITIC HALITE PSEUDOMORPHS FROM THE KEUPER MARL OF LEICESTERSHIRE, ENGLAND (1968)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 11 (1968), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Small, dendritic structures in probable playa lake sediments of the basal Keuper Marl in Leicestershire are interpreted as habit-modified halite pseudomorphs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1968.tb00858.x
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