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火星来客
发表于 2014-9-26 13:08:56
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The study of sedimentary rocks is often an exciting, challenging,rewarding and enjoyable occupation. However, to get the most out of
these rocks, it is necessary to undertake precise and accurate fieldwork.The secret of successful fieldwork is a keen eye for detail and an
enquiring mind; knowing what to expect and what to look for are important, although you do need to remain open-minded. Be observant,
see everything in the outcrop, then think about the features seen and look again. This book is intended to show how sedimentary rocks are
tackled in the field, and has been written for those with a geological background of at least first-year university or equivalent.
At the outset, this book describes how the features of sedimentary rocks can be recorded in the field, particularly through the construction
of graphic logs. The latter technique is widely used since it provides a means of recording all details in a handy form; further, from the data,
trends through a succession and differences between horizons readily become apparent. In succeeding chapters, the various sedimentary rocktypes, textures and structures are discussed as they can be described and measured in the field. A short chapter deals with fossils since these are an important component of sedimentary rocks and much useful information can be derived from them for palaeoenvironmental analysis;they are also important in stratigraphic correlation and palaeontological studies. Having collected the field information, there is the problem of knowing what to do with it. A concluding section deals briefly with facies identification and points the way towards facies interpretations,and the identification of sequences and cycles.
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