In reply to heallan:
*Look for an area you're interested in going to.
*Get the local guides and geological map and any photos, satellite images and local info you can find.
*Mark established areas on maps and look for similar features where there's nothing and or suggested possibilities (local info, photos from books etc).
*Make a plan of action that will allow you to explore without risking totally wasted days.
*Go out there and get frustrated.
Coastlines often yeild new rock since they're hard to explore/view. Local knowledge will help. To avoid the loose death-blocks of which you speak simply keep walking or put in some time cleaning first.
jk