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The Rollstone Boulder is a granite glacial erratic [1] [2] described by Peter Cristofono in his article "Minerals of Rollstone Hill" as being composed of "porphyritic Kinsman quartz monzonite." The phenocrysts in the boulder are plainly visible large white feldspar crystals. [3] The boulder weighs 110 short tons (100 t) and is 10 feet (3.0 m ...
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 ...
Stone Mountain, Georgia, site of granite quarrying from the 1830s. Its granite was used in the locks of the Panama Canal and in steps to the U.S. Capitol building. The mountain is known for its Confederate memorial carving started by Gutzon Borglum and for association with the Ku Klux Klan revival in 1916.
Granite is a hard stone and requires skill to carve by hand. Until the early 18th century, in the Western world, granite could be carved only by hand tools with generally poor results. A key breakthrough was the invention of steam-powered cutting and dressing tools by Alexander MacDonald of Aberdeen , inspired by seeing ancient Egyptian granite ...
Glacial erratic boulders of King County are large glacial erratic boulders of rock which were moved into King County, Washington by glacial action during previous ice ages.. The Pleistocene ice age glaciation of Puget Sound created many of the geographical features of the region, including Puget Sound itself, [1] and the erratics are one of the remnants of that age. [2]
The southernmost named glacier is the Lilliput Glacier in Tulare County, east of the Central Valley of California. Apart from Alaska, around 1330 glaciers, 1175 perennial snow fields , and 35 buried-ice features have been identified.
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