 You have what we call drop stones. Drop stones are basically rocks, bevels or even larger, which are transported by glaciers and sea ice. And when the glaciers or the sea ice melts, the stones just drop on the sea floor. They would have been picked up by the glaciers, so they are all shapes and also angular, frequently. And we have to remember that other icebergs, when they float, only one seventh of the iceberg is visible above the waterline. So in order for you to see drop stones, you need to know that you've had quite a substantial amount of water. And then here's an example of an angular drop stone, a pebble that is found in a very fine mud. And the two usually don't go together.