sedimentary structures

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Sedimentary Structures Of Ephemeral Streams

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ISBN : 0080869289
Genre : Science
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Sedimentary structures of ephemeral streams

Sedimentary Structures Their Character And Physical Basis

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ISBN : 0080869440
Genre : Science
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Sedimentary structures, their character and physical basis Volume 2

Comparison Of Sediments And Sedimentary Structures From Cores Taken On The Outer Middle And Inner Part Of Tidal Flat Off B Sum North Sea Germany

Author : Andi Yulianti Ramli
ISBN : 9781599423258
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Ten vibrocores were collected from the outer, middle and inner part of the tidal flats off Busum (German North Sea coast) to identify the gradual changes in sediment composition and sedimentary structures due to their location and input of hydrodynamic energy. The outer part of the investigation transect includes Tertiussand and D-Steert, the middle part is the huge sandbank of the Bielhovensand and the inner part comprises the Meldorf bight. The study turned out that the facies in the outer part is dominated by sandy material and the bedding types mainly are small scale cross bedding and massive sand. The facies of the middle part is characterized by a mixing of sandy and muddy material which results predominately in flaser bedding. The sediments of the inner part are characterized by silt and clay rich (muddy) materials with minor fine sandy components. Lenticular bedding is the typical bedding structure. From grain size analysis of the sand fraction, a distinctable grain size gradation from the outer part towards the inner part is clearly seen. In the outer part, the mean of mean grain sizes ranges between 2.9 Phi and 3.06 Phi. The average values slightly decrease in the middle part where they range between 3.12 Phi and 3.17 Phi. The finest grain sizes are found in the inner part with ranges from 3.5 Phi to 3.6 Phi. Even though the mean size and the standard deviation are independent values, they show a tendency that as the value of mean of mean grain size increases, the mean of standard deviation decreases. The mean of standard deviation on the outer part ranges between 0.36 and 0.43. On the middle part, mean of standard deviation ranges between 0.37 and 0.42. The inner part shows values of mean of standard deviation between 0.31 and 0.5. Increasing percentages of silt and clay here called mud can be identified from the outer part towards the inner part. In the westerly most seaward areas the mud content is normally low in the range of just a few percent with some rare exceptions of up to 36%. In the middle part the mud content ranges between 1.42% and 28.67%. The highest percentages of mud were found in the inner part of Meldorf Bight, where they range between 14.24% and 43.85%.

Sedimentary Structures

Author : John Collinson
ISBN : 1780460627
Genre : Nature
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Now enhanced with colour photographs and illustrations, this thoroughly revised fourth edition of Sedimentary Structures enhances its status as a major textbook in geology. Since its first publication in 1982, Sedimentary Structures has established and maintained itself as a pre-eminent resource that sets out a clear methodology and philosophy for understanding present-day sediments and sedimentary rocks as the product of dynamic processes. The fourth edition of this classic textbook introduces erosional, depositional and post-depositional sedimentary processes in an easily accessible way. It shows how sedimentary structures can be interpreted, across a wide range of scales, in terms of those processes. Sedimentary structures produced by erosion, deposition and post-depositional change are all clearly explained and related to the processes that formed them. Hydrodynamic and aerodynamic controls on the development of subaqueous and aeolian bedforms are discussed, as are the styles of deformation to which sediments can be subjected after deposition. Structures that characterize deposition caused by chemical and biologically influenced processes are explained and illustrated, along with the complex effects of chemical changes, and of animal and plant activity in modifying sediments after they have been deposited. The book ends with an introduction to the methods and principles of environmental interpretation, for which earlier chapters provide an invaluable basis. Sedimentary Structures is designed principally for use in undergraduate settings and will be invaluable to students reading geology, earth sciences, physical geography and environmental sciences throughout their degree studies. It will also appeal to enthusiastic students at colleges and schools, as well as to amateur geologists who want to gain an understanding of sedimentary processes and products. Furthermore, the book is also valuable as a reference for both academic researchers and industry professionals alike. The fourth edition covers all major recent developments in the subject. It is characterized by an abundance of informative illustrations and photographic examples, and introduces colour figures for the first time. This edition, the first prepared without the direct input of the late David Thompson, builds on a major re-write that paid particular attention to recent advances in the understanding of aeolian processes and bedforms, and in the interpretation of trace fossils. The introduction to environmental interpretation has been further developed to reflect recent advances in stratigraphic thinking, thereby enabling sedimentologists to more readily relate the occurrence of assemblages of sedimentary structures to likely environments of deposition. Sedimentary Structures emphasizes a practical, hands-on approach. It remains indispensable to those with a serious interest in the study of sedimentary structures, not only as fascinating features in themselves but also as key indicators in the reconstruction of past environments.

Sedimentary Structures In Dunes Of The Namib Desert South West Africa

Author : Edwin Dinwiddie McKee
ISBN : 9780813721880
Genre : Science
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Sedimentary Structures

Author : John David Collinson
ISBN : 0044451717
Genre : Paleocurrents
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Sedimentary Structures Their Character And Physical Basis

Author : John R. L. Allen
ISBN : STANFORD:36105032019684
Genre : Rocks, Sedimentary
File Size : 43. 7 MB
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Sand And Sandstone

Author : F. J. Pettijohn
ISBN : 9781461599746
Genre : Science
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This book is the outgrowth of a week-long conference on sandstone organized by the authors, first held at Banff, Alberta, in 1964 under the auspices of the Alberta Association of Petroleum Geologists and the University of Alberta, and again, in 1965, at Bloomington, Indiana, under the sponsorship of the Indiana Geological Survey and the Department of Geology, Indiana University. A 2- page syllabus was prepared for the second conference and published by the Indiana Geological Survey. Continuing interest in and demand for the syllabus prompted us to update and expand its contents. The result is this book. We hope this work will be useful as a text or supplementary text for advanced undergraduate and graduate courses in sedimentation, sedimentary petrology, or general petrology and perhaps will be helpful to the teachers of such courses. Though we have focussed on sandstones we have necessarily included much of interest to students of all sediments. We hope also that it will be a useful reference work for the professional geologist, especially those concerned with petroleum, ground-water, and economic geology either in industry or government. Because the subject is so closely tied to surface processes it may also be of interest to geo morphologists and engineers who deal with beaches and rivers where sand is in transit.

Methods For The Study Of Sedimentary Structures

Author : Arnold H. Bouma
ISBN : UCAL:B4554269
Genre : Nature
File Size : 74. 45 MB
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Petrology Of Sedimentary Rocks

Author : Sam Boggs
ISBN : 9780521897167
Genre : Science
File Size : 37. 25 MB
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Advanced textbook outlining the physical, chemical, and biological properties of sedimentary rocks through petrographic microscopy, geochemical techniques, and field study.

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