By W. Schwarzacher
This publication has hardback covers.Ex-library,With ordinary stamps and markings,In reliable all around situation.
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Extra resources for Sedimentation Models and Quantitative Stratigraphy
Very often such bedding planes can also be covered by trails and burrows as indicated in Fig. 7C. RATES OF SEDIMENTATION A 6 25 C D r-r--r-r-- Fig. 7. Various types of bedding planes. Precisely the same slowing of deposition and indeed very often slight erosion is noted in many clastic sediments as indicated in Fig. 7D. Many well-known criteria exist to enable the sedimentologist to decide whether a surface has been at one time the sea floor. Shrock’s classical work (1948) gives an excellent account of such primary sedimentation fabrics.
If one attempts to estimate rates of sedimentation, one can expect average values only over a considerable time period. An absolute time measurement is always involved regardless of whether such determinations are made on recent or on ancient sediments. Very often this is the biggest source of error in such estimates. A variety of methods have been employed with modern sediments. Traps have been used to collect sediment over a year or more and sometimes annual layering or varving was recognized and used for dating.
Adjusting for compaction, this average gives 304 B which is twice the amount of maximal sedimentation in older rocks. The discrepancy between ancient and modern sedimentation rates may arise for two reasons. The present-day sedimentation is unique in the sense that it follows very close to the last ice-age and although ice-ages have occurred before, the determination of ancient rates has not been restricted to such a short period following the glacial upset. The second and probably much more effective reason is the discrepancy between the length of the observation period applied to ancient and modern sediments.
Sedimentation Models and Quantitative Stratigraphy by W. Schwarzacher