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Anyone know how and why this unique rock formed?

Will attach photos on the site (don't see option here to do so) Found both rocks in same general location years apart. Site is quite remote and has only had winter logging activity, soils are mostly silty and is located in ancient floodplain area in east central BC. Both found on top of winter road cut.

What baffles me mostly about the larger rock is how the "small nodules, on the outside edge, formed so uniformly and that the "crease lines" formed across it in several places.

Any info or comments appreciated.

From Garth - July 15, 2012 at 23:44:53
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