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Boulder in British Columbia, Canada Kämmenkivi stone on the Pisa hill in Kuopio, Finland 2'500 Million years old rocks on a hill in Hyderabad, India. 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.
The most striking aspect of the boulders is their unusually large size and spherical shape, with a distinct bimodal size distribution. Approximately one-third of the boulders range in size from about 0.5 to 1.0 metre (1.6 to 3.3 ft) in diameter, the other two-thirds from 1.5 to 2.2 metres (4.9 to 7.2 ft).
Name and description Height County Image Airport Boulder, at Martha Lake Airport Park in Martha Lake, said to be "one of the largest glacial erratic boulders in urban King, Snohomish, and Pierce counties", [9] is approximately 20 feet (6.1 m) long on its longest axis and about twice a man's height.
Images of the numbered Flatirons on Green Mountain are ubiquitous symbols of the city of Boulder. The area abounds with Flatirons photographs, drawings, paintings, and sculptures. The city government, the University of Colorado, and many businesses make use of this symbol in their logos, advertisements, and marketing materials.
List of rocks on Mars – Alphabetical list of named rocks and meteorites found on Mars; Rock cycle – Transitional concept of geologic time; List of rock formations: for a list of unusual or culturally significant rock outcrops; Leaverite – Rock in the field that looks interesting but is actually not
^ Since 1983, Massachusetts has had 3 other official state rocks: State Historical Rock (Plymouth Rock), State Explorer Rock (Dighton Rock), and State Building and Monument Stone . In 2008, a State Glacial Rock (Rolling Rock) was designated as well. [82]
Multiple erratics on the terminal moraine of the Okanogan Lobe. The Cascade Mountains are in the background.. The term "erratic" is commonly used to refer to erratic blocks, which geologist Archibald Geikie describes as: "large masses of rock, often as big as a house, that have been transported by glacier ice, and have been lodged in a prominent position in the glacier valleys or have been ...
Giant Rock is a large freestanding boulder in the Mojave Desert near Landers, California, and the Marine Corps Air Ground Combat Center Twentynine Palms covering 5,800 square feet (540 m 2) of ground. Giant Rock is the largest freestanding boulder in North America and is purported to be the largest free standing boulder in the world. [1]