Author: petr.dlouhy[at]email.cz
[Added to the original trac issue at 6.20pm, Tuesday, 17th May 2011]

There are some rendering proposals: http://wiki.openstreetmap.org/wiki/Talk:Proposed_features/rock#bare_rock_proposal

Rocks are also not rendered in Mapnik.

Author: webreg[at]volki.at
[Added to the original trac issue at 7.26pm, Tuesday, 9th August 2011]

This ticket is a duplicate to part of #3294.

Well, rocks are not rendered in Mapnik, but that's just a fact, not a reason. Anyway, cliffs are not rocks. Nodes with natural=cliff are similar to peaks. When peaks are rendered, cliff nodes should be rendered too. I suggest rendering them as triangles, see my description in #3294.

Author: ingalls
[Added to the original trac issue at 6.57pm, Monday, 19th November 2012]

I'm afraid I have to disagree with this. With a single node for a cliff there is no way that one could orient the triangle. The renderer would have to way of telling what the top of the cliff was vs the botton.

Author: fkv
[Added to the original trac issue at 7.37pm, Wednesday, 12th December 2012]

The triangle symbolizes a conical rock. Therefore it should always be upright (pointing "north"), with the small side along the bottom.

Author: math1985
[Added to the original trac issue at 8.30pm, Tuesday, 5th August 2014]

This issue is now being discussed on Github: gravitystorm/openstreetmap-carto#849

Therefore, I will close the issue here.