By David M. Rubin
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Additional resources for Cross-Bedding, Bedforms, and Paleocurrents (Concepts in Sedimentology & Paleontology 1)
Example text
Yardangs are possible eolian examples, and sediment furrows that occur in the deep sea and in estuaries are possible subaqueous examples. Oscillation ripples that occur in an area undergoing erosion can also produce this structure (Fig. 11). FIG. - Structure formed by a stoss-erosional and lee-erosional angle of climb. RECOGNITION: This structure is purely erosional, and consequently is probably extremely rare. Preservation can occur when the rate of deposition increases, a similar situation to that shown in Figures 13 and 14.
ORIGIN: Although similar to the preceding example, this structure requires height-fluctuation cycles that are shorter relative to the bedform period (the time required for the bedforms to migrate a distance equal to the bedform spacing). FIG. - Structure formed by bedforms undergoing small but rapid fluctuations in height. This structure is one kind of scalloped cross-bedding (Rubin and Hunter, 1983; Rubin, 1987). The left figure shows the bedform surface at a time when bedform height was a niaximum; the right figure shows the same bedform at a later time when height was a minimum in the height-fluctuation cycle.
FIG. - Structure formed by bedforms with superimposed bedforms migrating in the opposite direction. RECOGNITION: This structure differs from the preceding example in having cross-beds that consistently onlap the bounding surfaces scoured by the superimposed bedforms. ORIGIN: As in the preceding example, this structure forms without requiring fluctuating flows. Structures are unlikely to form exactly as illustrated in this example, because the two sets of bedforms are migrating in opposite directions across the entire bed surface at all times.