Wonderful Rock Formations!
Strangely Round Rocks of "Unknown Origin"
Well, saying "unknown origin" is an obvious exaggeration, since it is widely assumed that they must be sedimentary concretions, and were created by cementation of mud stone, coastal erosion, time and elements, just like any other unusual rock formation.
(image via)
Yet their bizarre cracked shells, often perfectly spherical shape and unexpected locations remain largely unexplained and keeps them regarded as a "geological mystery". Not to mention Read more [...]