Tagging extended fields of boulders (blockfields etc.)

There is very limited usage of [natural=boulder_field][1] (a couple by me, but there are other contributors using the tag). Boulder fields may be created through a number of mechanisms: (geologically) recent massive rock fall; peri-glacial frost heave breaking up bare rock (good examples in Pennsylvania); some raised beaches lifted by isostasy (Sweden).

Città dei Sassi, an example of a field of massive boulders

Specific examples of the phenomenon (not necessarily mapped as such):

• Above Vals in Graubunden. Geological origin unknown. Probably good habitat for Rock Partridge.
• Città dei Sassi near the Sella Pass. This is mapped as scree, but this is clearly incorrect, some of the boulders are house sized. Origins as a Bergsturz from the E flank of the Langkofel.
• Chalamain Gap in the Cairngorms. A glacial overflow channel with large boulder blocks. (again mapped as scree).
• Goldauer Bergsturz. In the wooded areas on the debris of the 1806 rock fall there are numerous very large boulders with the field extending beyond the railway line towards the Lauzersee

This recently came up in another forum and I did some checking between what's posted here and there. Similar references to Felsenmeer and terrain such as that. Short answer is natural=blockfield.