The cache container is at the posted coordinates but there is a challenge to complete before logging . Only online "found it" logs that have previously satisfied the "Challenge" will remain on the listing.
This challenge is to find 20 Earth Caches, one for each Earth Cache classification. EarthCaches around the world are administered by the Geological Society of America. They are a unique geocache type that are a great outdoor activity that the whole family can enjoy. EarthCaches are organized by a classification system, which can be seen on the EarthCache website. The classification is not listed on the EarthCache page at Geocaching.com.
You can search for Earthcaches by type using tihis link Earthcache Search then you will need to use the advance search tab.
This system categorizes each EarthCache according to the following types:
Cave/Karst Feature
Coastal Feature
Erosional Feature
Fault Feature
Fold Feature
Fossil Site
Geomorphological Feature
Glacial Feature
Historical Site
Hydrologic Feature
Igneous (Plutonic) Feature
Igneous (Volcanic) Feature
Impact Feature
Metamorphic Feature
Mineral Site
Mining Site
Other Feature
River Feature
Sedimentary Feature
Structural Feature
1) Find an Earth Cache for each classification listed above
2) All past finds are eligible
3) Your own hides do NOT count
4) Post your qualifying finds in your log or create a bookmark list