Interference ripples
Interference ripples are a type of sedimentary structure made up of two sets of ripples formed at right-angles to each other as a result of there being two dominant paleocurrents. These ripples may be formed in the beds of intermittent streams.
References
Further reading
- Prothero, D. R. and Schwab, F., 1996, Sedimentary Geology, pg. 43-64,ISBN 0-7167-2726-9