The bluffs have small slow slides, trickles of sand coming down, and then larger slides too. The large collapses are complete with trees that come down. The edge of the bluff in this part is full of partial kite shapes.
This clay boulder is about 3 feet by 3 feet by one foot. This slide from the cliff is recent enough that the clay has split and the layers are unmarred. It is all too easy to imagine standing there when the cliff comes down. We stepped carefully between the boulders, trying to stay on gravel, because the clay is way too slippery. Clay is aluminum silicates with small particles and a sheetlike structure. It can contain iron, as the brown streaks in here show. The sheetlike structure is very clear.