In geology , a boulder (or rarely bowlder ) is a rock fragment with size greater than 25.6 cm (10.1 in) in diameter. Smaller pieces are called cobbles and pebbles . While a boulder may be small enough to move or roll manually, others are extremely massive. In common usage, a boulder is too large for a person to move. Smaller boulders are usually just called rocks or stones.
3-777: Columbia Boulder is a 30-foot-tall (9.1 m) boulder located in Camp 4 at Yosemite National Park . It is the largest boulder in Camp 4 and easily seen from the campground . According to Mike Borghoff, there are no easy bouldering problems on Columbia Boulder. There are several bouldering problems on Columbia including the iconic Midnight Lightning . Other famous routes on the boulder include: Robbins Eliminate , named after Royal Robbins ; Bates Problem , named after Barry Bates ; and Ament Arête , named after Pat Ament . In attempts to improve relations between climbers and park rangers , discussions over free coffee usually take place once
6-769: A different rock type than the bedrock on which they are deposited. One such boulder is used as the pedestal of the Bronze Horseman in Saint Petersburg , Russia. Some noted rock formations involve giant boulders exposed by erosion , such as the Devil's Marbles in Australia 's Northern Territory , the Horeke basalts in New Zealand , where an entire valley contains only boulders, and The Baths on
9-711: A week from spring to autumn beside Columbia Boulder. 37°44′30″N 119°36′9″W / 37.74167°N 119.60250°W / 37.74167; -119.60250 This climbing -related article is a stub . You can help Misplaced Pages by expanding it . Boulder The word boulder derives from boulder stone , from Middle English bulderston or Swedish bullersten . In places covered by ice sheets during ice ages , such as Scandinavia , northern North America , and Siberia , glacial erratics are common. Erratics are boulders picked up by ice sheets during their advance, and deposited when they melt. These boulders are called "erratic" because they typically are of
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