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brownstone |
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brownstone, red to brown variety of sandstone sandstone, sedimentary rock formed by the cementing together of grains of sand. The usual cementing material in sandstone is calcium carbonate, iron oxides, or silica, and the hardness of sandstone varies according to the character of the cementing material; quartz
..... Click the link for more information. . Its unusual color is caused in some instances by the presence of red iron oxide which acts as a cement, binding the sand grains together. Vast thicknesses (up to 20,000 ft/6,096 m) of brownstone were deposited in the present-day Connecticut River Valley of Massachusetts and Connecticut and in central New Jersey during the latter part of the Triassic period Triassic period , first period of the Mesozoic era of geologic time (see Geologic Timescale, table) from 205 to 250 million years ago. Throughout the Triassic, E North America, as a result of the mountain-building episode that formed the Appalachians in the ..... Click the link for more information. . Quarries in these regions were the source for much of the building stone used in the late 19th and early 20th cent. in the construction of the many brownstone houses found from Baltimore to Boston; the stone, however, is not very durable, especially if poorly laid or maintained. Similar, but more brightly colored, sandstones also were deposited in the Rocky Mt. region during the Triassic period and Jurassic period Jurassic period [from the Jura Mts.], second period of the Mesozoic era of geologic time, lasting from 213 to 144 million years ago. At the start of the Jurassic most of the continents were joined together until the Atlantic began to form and the Americas split off ..... Click the link for more information. . These deposits are called "redbeds" and make up the colorful landscapes of the Painted Desert of Arizona. brownstone [′brau̇n‚stōn] (petrology) Ferruginous sandstone with its grains coated with iron oxide. brownstone 1. A dark brown or reddish brown arkosic sandstone, quarried and used extensively for building in the eastern US during the middle and late nineteenth cent. 2. A dwelling faced with brownstone, often a row house. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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