re: Possible evidence spherules formed by water

Volcanic Bean Stone (Pisolite)
It is also called fossil of raindrops, but it is not a fossil.
Clouds are developed at the time of volcanic eruptions. From those clouds, water drops fall and gather volcanic ashes around them to form these concentric balls.
http://www.kiseki-jp.com/english/stone-information/collection/collections/volcanic-bean.html
