Earthcaches are relatively new. They are first approved by Geoaware through the Geosociety of America. You can visit their website at Earthcaches.
Thier purpose is to educate everyone (especially geocachers) about the natural world that we live in. Hopefully by having more people learn and understand some of the natural features of our Earth like fossil sites, unique landscapes, rock outcrops and other geologic processes, we will all have a greater appreciation for where we live.
Earthcaches are more than just virtual caches because of their educational aspect. If anyone has recommendations for new Earthcaches visit the website.