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Waterfalls. A waterfall is by itself is not enough geology as a feature for an EarthCache, but with a description how the waterfall affects the local geology or how it has been created, the cache can work. Remember that the described geological feature must be visible at the site, and be able to build the logging task on.
Museums, or indoors in general. Earthcaches must involve, just like any other cache, GPS usage, so you cannot create an Earthcache that is completely indoors. However, if there is an outdoor stage/waypoint on the cache that involves GPS usage and it is possible to connect with something that you see indoors, the cache can work. The logging task must also include outdoor/GPS usage.
Statues, sculptures or other building stones. These kind of EarthCaches must describe the stone structure, minerals or fossils. Descriptions about rock types, formation or general description of the rocks origin is not good enough. The logging task must also be linked to the stone in place and its geological properties describe above.
5) Helpful links for further Reading.
Geocaching Help Center about EarthCaches, link to Geocaching HQ
EarthCache Submittal Guidelines, available in many languages, link to Geological Society of America
The Geological Society of America, EarthCache FAQ, link to Geological Society of America
The Geological Society of America, homepage of EarthCaches, link to Geological Society of America
