pavement made with small boulders.
Also, bowldering.

1875–80; boulder to pave with boulder(s) + -ing1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bouldering (ˈbəʊldərɪŋ)
rock climbing on large boulders or small outcrops either as practice or as a sport in its own right

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Because it's generally safer and requires only rock shoes and a crash pad, bouldering is the hottest trend in climbing.
Session activities include bouldering, rappelling and rock climbing.
If you go climbing or bouldering on your own, you may be able to pioneer a new
  route or two.
Yet nontechnical approaches require only moderate bouldering, which ensures
  that the trio are within reach of any fit backpacker.
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