boulder

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Boulder,

city (1990 pop. 83,312), seat of Boulder co., N central Colo.; inc. 1871. A Rocky Mountain resort and a suburb of Denver, it is the seat of the Univ. of Colorado (1876). Industries include aerospace and biological research; the manufacture of machinery, electric, electronic, and computer equipment, and medical supplies; and software development. Boulder is home to the National Center for Atmospheric Research and other government and private research operations and is known as a mountain sports and "New Age" mecca.

boulder,

large rock fragment formed by detachment from its parent consolidated rock by weathering and erosion. In engineering and geology, especially in the United States, the term is applied to loose rocks having specific sizes according to various systems of classification, i.e. the Wentworth scale (for C. K. Wentworth, American geologist), where a boulder has one linear dimension of at least 10.1 in. (25.4 cm). Boulders transported by glacial ice are usually referred to as glacial erratics; glacial boulder fields, or felsenmeer, containing large blocks of angular rock broken from intense frost action are evidence that the region has experienced glacial action in the past. See driftdrift,
deposit of mixed clay, gravel, sand, and boulders transported and laid down by glaciers. Stratified, or glaciofluvial, drift is carried by waters flowing from the melting ice of a glacier.
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; morainemoraine
, a formation composed of unsorted and unbedded rock and soil debris called till, which was deposited by a glacier. The till that falls on the sides of a valley glacier from the bounding cliffs makes up lateral moraines, running parallel to the valley sides.
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.

boulder

[′bōl·dər]
(geology)
A worn rock with a diameter exceeding 256 millimeters. Also spelled bowlder.

boulder

A naturally rounded rock fragment larger than 10 in. (25 cm) in diameter; used for crude walls and foundations, generally in mortar.

boulder

1. a smooth rounded mass of rock that has a diameter greater than 25cm and that has been shaped by erosion and transported by ice or water from its original position
2. Geology a rock fragment with a diameter greater than 256 mm and thus bigger than a cobble
References in periodicals archive ?
Close ME, Lee R, Magesan GN, Stewart M, Skuse G, Bekesi G (2005) Field study of pesticide leaching in a Himatangi sand (Manawatu) and in a Kiripaka bouldery clay loam (Northland).
If Skregmore's switchback crest proved difficult, then the sight of Beenkeragh's bouldery pyramid rising next in line could reduce some walkers to tears," writes Dillon.
Close ME, Lee R, Magesan GN, Stewart MK, Skuse G, Bekesi G (2005) Field study of pesticide leaching in a Himatangi sand (Manawatu) and in a Kiripaka bouldery clay loam (Northland).
Ice-contact diamictons from the Fraser Glaciation are exposed over much of the central and northern strait, evident by the rough bouldery surface (Fig.
British Columbia's west coast, being the most seismically active area in Canada, required a seismically sound design for the duct which is being conservatively installed at or near the hard bouldery glacial till at depths ranging from 8 to 21 feet.
We spent the rest of the afternoon wading in bouldery shadows near the shore as the first Graywolf River pinks made the summer climb to their spawning gravels in the deep, unbroken forests of Washington's Olympic Mountains.
Sarmah AK, Close ME, Pang L, Lee R, Green SR (2005) Field study of 2pesticide leaching in a Himatangi sand (Manawatu) and a Kiripaka bouldery clay loam (Northland).
The bouldery clay 'drift' was the not the product of a tropical ice sheet but deep weathering of igneous rocks and exfoliation of core stones (Branner, 1893; Fig.
This paper discusses the results from two further sites: (i) a Kiripaka bouldery clay loam in Northland, and (ii) a Himatangi sand in the Manawatu region.
1967) with low clay content contributing to the low cation exchange capacity; Kiripaka bouldery silty clay (Grid ref.
Available data on field leaching studies of pesticide in New Zealand Soil Type & Location Duration Pesticides (days) used Horotiu sandy loam, Hamilton 156 Nicosulfuron Te Awa silt loam, Hawkes Bay 64 Atrazine Simazine Picloram Twyford fine sandy loam, Hawkes Bay 640 Atrazine Simazine Picloram Horotiu sandy loam, Hamilton 632 Atrazine Picloram Hexazinone Procymidone Terbuthylazine 2,4-D Triclopyr Himatangi sand, Manawatu 540 Atrazine Terbuthylazine Hexazinone Procymidone Diazinon Kiripaka bouldery clay loam, Maungatapere, Northland 540 Atrazine Terbuthylazine Hexazinone Procymidone Diazinon Maximum leaching depth Soil Type & Location (cm) Soil Suction cup Horotiu sandy loam, Hamilton 10 n.