The preceding chapter has shown that in the course of undisturbed sedimentation the various depositional environments produce specific orders of superposition of lithofacies which are recognisable in the stratigraphic column as either rhythmic or cyclic patterns. The strongest cyclicity results from coastal settings, where on either side of the shoreline several contrasting depositional environments coexist which can be shifted readily by relative sea level variations. Coal measures interbedded with marine sediments therefore provide particularly good examples of cyclic sedimentation and were used by Weller (1930) to formulate the concept of cyclothems, which for many decades strongly influenced research into coal measure sedimentation (Fiege 1937, 1952; van Leckwijck 1948; Wanless 1931, 1950; Wanless and Weller 1932; Wanless and Shephard 1936; Weller 1956, 1958; Moore 1950; Moore 1959; Jessen 1956a–c, 1961; Jessen et al. 1952, and others). A comprehensive summary of the early work is given by Duff et al. (1967).
Weitere Kapitel dieses Buchs durch Wischen aufrufen
- Coal Formation and Sequence Stratigraphy
Claus F. K. Diessel
- Springer Berlin Heidelberg
Fallstudie Überschwemmungskarten/© Thaut Images | Fotolia