Pacific Coastal & Marine Science Center
Bedform Sedimentology Site: “Bedforms and Cross-Bedding in Animation”
FIG. 17. Structure formed by bedforms undergoing large and rapid fluctuations in height. The left figure shows the bedform surface at a time when bedform height was a maximum; the right figure shows the same bedform at a later time when height was a minimum in the height-fluctuation cycle.
RECOGNITION: This structure is similar to the preceding example, but the height fluctuations shown here are greater and have a more pronounced effect.
ORIGIN: This structure originates by the same process as the two preceding examples, but the greater height fluctuations in this example imply a greater fluctuation in flow conditions.