A tidal bundle sequence can be seen as a variation in bed thickness with a periodicity of 14 days or 28 days. During the neap tide, when the tidal currentstrength is weakest, smaller quantities of finer grains are deposited. As the tidal variation grows larger, towards the spring tide, larger quantities of coarser material will be deposited which results in an increasingbed thickness. Bed thickness will be greatest at the spring tide and then decreases as the tidal variation grows smaller, towards the neap tide again and the thinnest beds.