Discussion
Core stones within a weathered profile are
Answer: C
Correct answer: fresh rock remnants surrounded by decomposed material
Core stones are what is left of the original blocks after spheroidal weathering has attacked them from every joint face - rounded masses of fresh rock isolated within saprolite. They are the reason a borehole in a weathered profile can strike hard rock at a shallow depth and still not have reached rock head, since the drill may have entered a boulder with soft material beneath it.
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