boulder pavement in a sentence

1. Eventually enough large boulders were left behind that a boulder pavement was produced, which inhibited further downward cutting.
2. Again, a boulder pavement formed and, as before, the lake level stabilized at a lower level, again forming another set of beaches.
3. There are potholes at Portage de Talon and numerous cataracts and former river channels, such as the boulder pavement between Pine Lake and McCool Bay, 12 15 metres ( 39 49 ft ) above the river's present day water-line.
4. It's difficult to find boulder pavement in a sentence.