Pacific Coastal & Marine Science Center
Bedform Sedimentology Site: “Bedforms and Cross-Bedding in Animation”
FIG. 43a. Structures formed by bedforms with along-crest- migrating, out-of-phase sinuosities. Fig. 43a (A) Rate of along-crest migration of sinuosities is equal to the rate of lateral migration of the main bedform. Fig. 43b (B) Rate of along-crest migration of sinuosities is approximately four times the rate of lateral migration of the main bedform.
RECOGNITION: In some vertical sections, these structures are relatively similar to structures produced by bedforms with in- phase crestlines (FIG. 42), but the two kinds of structures are distinguishable in horizontal sections.
ORIGIN: These types of structures require conditions that produce oblique bedforms with sinuous out-of-phase crestlines; specific fluid dynamic requirements are unknown.