Tag:natural=blockfield
 natural = blockfield
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| Description |
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A pile of rocks, often formed as a result of volcanic or glacial activity.  
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| Group: natural |
| Used on these elements |
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| Status: in use |
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A blockfield (also spelt block field), felsenmeer, boulder field or stone field is a surface covered by boulder- or block-sized rocks often associated with a history of volcanic activity, alpine and subpolar climates and periglaciation, sometimes with the erosion of sedimentary rock.
Blockfields differ from screes and talus slope in that blockfields do not apparently originate from mass wastings.
See 
blockfield.
How to map
To map an area 
of blockfield you can just draw a line closing on itself, marking the area of blockfield and tag it natural=blockfield. To map large blockfield covered areas you can use relation:multipolygon with the same tag.
It is possible to map based on the surface layer or based on the layer below the surface.
If mapping is done based on the layer below the surface, it is possible that moss, grass, or trees may sometimes grow on top of it.
(What makes it different from normal land is that it's made of stone, and it's still empty below the surface.) E.g. Gotjawal_Forest
You can also use the 'wetland=bog' tag (without the natural=wetland tag) if vegetation has formed over the area.[1]
It's usually sloping, but it can also be very gentle or nearly flat. Whether they form a slope or not doesn't matter much because the boulders are usually large, so they rarely flow downhill anymore, and there is no tendency for rockfall.
Gallery
The boulder field at Hickory Run State Park in Pennsylvania, PA, USA.
Boulder stream of the Kaser Steinstube near Triftern
Jeju Gotjawal area (Dongbaek-dongsan, Jeju, South Korea) with vegetation on top of the blockfield.
A blockfield of Jangsan Mountain in Busan, South Korea, the result of volcanic activity a long time ago.
Kurumnyk on Mount Strymba - Gorgany, Carpathians, Ukraine
East Falkland, Falkland Islands
Massive boulders many in excess of 100 tonnes litter the glen floor with big holes and gaps between them. Moss and Ferns every where.(Easter Boleskine, Inverness, UK)
Cranstackie, Scotland
Big Stone River, Taganai, Russia
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See also
- natural=scree
- natural=shingle
- natural=bare_rock
- wetland=bog - If vegetation has formed over the area
References
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