From OpenStreetMap Wiki
This is used to describe the geological makeup of an area. See the page Geological for an introduction on its usage.
|geological||moraine||A moraine is any ice formed accumulation of unconsolidated glacial debris (soil and rock) which can occur in currently glaciated and formerly glaciated regions, such as those areas acted upon by glacial ice.|
|geological||outcrop||An outcrop site is a place where the bedrock or superficial deposits have become locally exposed and are directly accessible to analysis.|
|geological||palaeontological_site|| Paleontologisch vindplaats
Plaats of gebied waar geconsereveerde overblijfselen van prehistorische levensvormen.
|geological||user defined||Zie Taginfo voor meer informatie|