Sinkholes

Sinkholes are harvested from Floating Stones level 4 and above. Sinkholes are the only reliable source of Amber, which is the source of both Fossils and Mineral Deposits.

Sinkholes, starting at level 4, can be harvested for a range of objects: Amber, Treasure Chests, Trees of Life, and very rarely Tormundi Eggs. Sparkling sinkholes can be tapped for Amber.

Higher level Sinkholes produce higher level Treasure Chests and Trees of Life, but not at a 1 to 1 rate. Level 8 Sinkholes (Radiant Pool) will produce Trees of Life level 4, Coins level 3, and Treasure Chest level 4.

Sinkholes take significantly longer to harvest at higher levels. At level 5, it takes 30 seconds but at level 7, it takes 90 seconds. The long harvest time makes high-level sinkholes an option for "stalling" spare creatures to conserve their energy, but only one creature can harvest one sinkhole at any time.

Object Information
There are currently 12 different levels of Sinkholes, with level 12 being a Wonder.