ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1967.tb01300.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

摘要:

SUMMARYFrom smallest to largest, the component layers of a sedimentary body are laminae, laminasets, beds and bedsets. Different arrangements of these layers characterize different types of sedimentary bodies and identify different depositional processes. Concepts of these layers are redescribed because previous definitions are not adequate for modern quantitative descriptions of sedimentary bodies. The four kinds of layers are genetically similar; when compared with each other, they differ principally in areal extent and interval of time for formation. Because beds are usually the most readily recognized layers, they are considered the basic “building blocks” of sedimentary bodies.Beds are bounded by depositional surfaces termed bedding surfaces; each surface is practically synchronous, and a bed can be considered an informal time stratigraphic unit of limited areal extent and of relatively short time span. This concept broadens the scope of intrabasinal correlations, permitting time correlations more refined than possible using fossils or radioactive age dating. Also, a better understanding of the mode of genesis and recognition of distinguishing characteristics of different types of sedimentary bodies follow from this conc

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1967.tb01301.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

摘要:

SUMMARYAt the moment of deposition an ideal sediment has certain topological properties. The diagenetic process is driven by the reduction of surface area and this process is considered in relation to the topological properties. The connectivity and genus increase as cementation occurs and in some systems may decrease again. Relations between genus, density, depth of burial and time are considered for a sand‐sandstone syste

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1967.tb01302.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

摘要:

SUMMARYIf a modified version of the Zingg system is used particles can be subjectively classified into four shape classes. The roundness of a particle can be estimated by assessing the flat/convex/concave ratio and can then be represented as a point on a triangular net; this point can also indicate the Zingg class of the particle.

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1967.tb01303.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

摘要:

SUMMARYQualitative and quantitative observations show a general positive correlation between grain size and thickness of cross‐bedded units. Greater sand‐wave height correlates with greater turbulence which permits more and coarser grains to be transported. A theory is developed which qualitatively explains these relationsh

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1967.tb01304.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

摘要:

SUMMARYThe computer program presented here seeks to improve estimation of statistical parameters for grain‐size data by use of interpolated values. Interpolation is made by fitting a series of overlapping parabolas to the data, and follows the method of Snyder(1961). The values are used in moment formulas to compute standard statistical measures. Skewness and kurtosis are reduced by the interpolation data, and extreme positive values of kurtosis tend to be greatly reduced. The program also picks major modes, the median, and sediment typ

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1967.tb01305.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

摘要:

SUMMARYRe‐interpretation ofCyrtina septosaBand (Lower Carboniferous) data from Derbyshire (England) by trend analysis reveals previously unrecognised but meaningful sedimentational patterns. Trends in geographic variation of number of shells; their disarticulation, orientation, and size; and thickness of the Band are judged to be indicative of water depth and turbulence, conditions of accumulation, and sourc

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1967.tb01306.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

摘要:

SUMMARYThe salinity facies of the Keuper sediments on the basis of the determination of boron contentThe boron concentration of illites from sediments of the German Keuper Basin has been investigated in order to define palaeosalinity. The regional boron distribution of the Schilfsandstein and Lettenkeupersandstein Formations which have been sedimented in great lateral uniformity plainly corresponds with the current directions evaluated from cross‐bedding measurements. Short‐time variations of palaeosalinity during the Gipskeuper Formation have no effect on boron concentration, thus confirming the laboratory experiments of the installation of boron in illites which indicated that considerable time is required for establishing the boron‐ illite equilibrium. The present investigations show that boron in illites can be success‐ fully applied to regional problems provided that close consideration is given to the mineralogical composition of the s

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1967.tb01307.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

摘要:

SUMMARYStructurally initiated recrystallization is of two types: in the first type, the common one, the effect is internal and self‐destructive, and in the second type the effect is external and leads to retention of pre‐existing structu

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1967.tb01308.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

摘要:

SUMMARYAn automated photographic method is described for recording short‐interval changes in sand levels on a natural beach. Results of photographic technique are compared with profiles obtained by conventional surveying methods. Lapse‐time photography offers a wide range of possibilities for accurate and efficient beach measurements when information in large amounts is requi

ISSN:0037-0746    

DOI:10.1111/j.1365-3091.1967.tb01309.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY