Tagging extended fields of boulders (blockfields etc.)

How should extended fields of boulders (blockfields and similar formations) be tagged? A prominent example would be the so-called "Felsenmeer" (stone sea) in the Odenwald region in Germany, but you can find such fields at a smaller scale in many other places.

Possible tags and why they don't really work:

The aforementioned "Felsenmeer" is currently tagged as natural=bare_rock, but looking at the description and examples in the wiki, that seems to be more apt for contiguous rocky surfaces connected to the ground, not loose rocks. I'm also not sure if it can be called "bedrock" in such cases (as the bare_rock description requires).
natural=stone is for an individual boulder.
natural=rock allows groups but they have to be connected to the underlying bedrock (not the case here).
natural=scree requires the stones to be angular (not the case here) and to have been accumulated "by rockfall from adjacent rockfaces".
natural=shingle requires deposition and shaping by water transport (not necessarily the case).

Is there another tag for this that would fit better or am I missing something else?

asked 27 Mar '22, 18:02

smheidrich
26●1●1●4
accept rate: 0%

edited 30 Mar '22, 11:19

2 Answers:

active answers oldest answers newest answers popular answers

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

permanent link

answered 01 Apr '22, 23:42

SK53 ♦
28.1k●48●268●433
accept rate: 22%

edited 02 Apr '22, 13:25

1	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. permanent link answered 24 Jan, 04:45 cactolith 26 accept rate: 0%

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here

By RSS:

Answers

Answers and Comments

Markdown Basics

*italic* or _italic_
**bold** or __bold__
link:[text](http://url.com/ "title")
image?![alt text](/path/img.jpg "title")
numbered list: 1. Foo 2. Bar
to add a line break simply add two spaces to where you would like the new line to be.
basic HTML tags are also supported

learn more about Markdown

Question tags:

tags ×191
rock ×4
stone ×4
rocks ×3
stones ×3

question asked: 27 Mar '22, 18:02

question was seen: 1,266 times

last updated: 24 Jan, 04:45

Tagging extended fields of boulders (blockfields etc.)

Follow this question

Related questions