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In geology, a boulder (or rarely bowlder) [1] is a rock fragment with size greater than 25.6 cm (10.1 in) in diameter. [2] Smaller pieces are called cobbles and pebbles. While a boulder may be small enough to move or roll manually, others are extremely massive. [3] In common usage, a boulder is too large for a person to move.
Indian Rock in Montebello, New York is a large glacial erratic boulder of granite gneiss, formed in the Proterozoic (Precambrian) era, 1.2 billion to 800 million years ago. It is estimated to weigh ≈17,300 tons. Madison Boulder, a 5,000-short-ton (4,500 t) glacial erratic the size of a large house in Madison, New Hampshire.
Wentworth grain size chart from United States Geological Survey Open-File Report 2006-1195: Note size typos; 33.1mm is 38.1 & .545mm is .594 Beach cobbles at Nash Point, South Wales Grain size (or particle size ) is the diameter of individual grains of sediment , or the lithified particles in clastic rocks .
The boulder covers 5,800 square feet (540 m 2) of ground and is seven stories high. [citation needed] Giant Rock is the largest freestanding boulder in North America and is purported to be the largest free standing boulder in the world. [1] Native Americans of the Joshua Tree area consider it to be sacred.
A cobble (sometimes a cobblestone) is a clast of rock defined on the Udden–Wentworth scale as having a particle size of 64–256 millimeters (2.5–10.1 in), larger than a pebble and smaller than a boulder. Other scales define a cobble's size differently. A rock made predominantly of cobbles is termed a conglomerate.
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The Zayit Stone is a 38-pound (17 kg) limestone boulder dating to the 10th century BCE, discovered on 15 July 2005 at Tel Zayit (Zeitah) in the Guvrin Valley, about 50 kilometres (31 mi) southwest of Jerusalem. [1] The boulder measures 37.5 by 27 by 15.7 centimetres (14.8 in × 10.6 in × 6.2 in) and was embedded in the stone wall of a building.
The boulder, which gleams golden and popularly known as the Golden Rock on which the small Kyaiktiyo Pagoda has been built, is about 25 ft (7.6 m) in height and has a circumference of 50 ft (15 m). The boulder sits on a natural rock platform that appears to have been naturally formed to act as the base to build the pagoda.