By Harold G. Reading
Sedimentary Environments is without doubt one of the such a lot amazing and influential textbooks within the earth sciences released within the final twenty years. the 1st and moment versions either received common compliment and have become vintage works in sedimentology. because the book of the final variation, the learn of sedimentary environments and facies has made nice strides, with significant advances in facies modelling, series stratigraphy and basin modelling. The third variation of this vintage textual content will most probably set the benchmark even larger, and remember the fact that, will proceed being the textbook of selection for sedimentology scholars. the most recent version of a vintage textual content. comprises the entire most up-to-date advances in dynamic stratigraphy. Will stay the textbook of selection for top point undergraduate and graduate scholars in sedimentology.
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Extra info for Sedimentary Environments: Processes, Facies and Stratigraphy, 3rd Edition
Sample text
Very low uniform dips suggest horizontal beds or lamination. High angle uniform dips suggest large-scale foresets as in aeolian dunes. Upward-decreasing dips may indicate convex upward bedforms or a decrease in crossbed size as can be found in fining-upward channel-fills. However, in order to resolve smaller-scale cross-bedding and thereby extract palaeocurrent information from aqueous sandstones, it is necessary to process dipmeter data to smaller vertical intervals than is usual. Only then are foresets, rather than set boundaries or other surfaces, likely to be resolved (Cameron, 1992).
II. Complex ~ sigmoid-oblique Shingled Seismic-stratigraphic units and seismic sequences Seismic facies are grouped together into packages of seismicstratigraphic units (Brown & Fisher, 1977) that are seismic reflection-bounded units composed of contemporaneous depositional systems (Brown & Fisher, 1977) or seismic sequences of internally concordant reflections bounded by 'unconformities and their correlative conformities' (Fig. 7; Mitchum, Vail & Thompson, 1977). These sequences are 10s-100s m thick and may include a wide range of depositional environments and facies and facies associations as understood by outcrop geologists.
Where definition depends on features seen in thin section, as is often the case with carbonates, the term microfacies is used. Apart from these uses of the word facies, which are all primarily descriptive, it has also been used in more genetic senses - that is, for the products of a process by which a rock is thought to have formed, for example 'turbidite facies' for the inferred deposits of turbidity currents; or in an environmental sense for the environment in which a rock or suite of rocks is thought to have formed, for example 'fluvial facies' or 'shelf facies'; or as a tectofacies, for example 'postorogenic facies' or 'molasse facies'.