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greensand |
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greensand [′grēn‚sand] (geology) A greenish sand consisting principally of grains of glauconite and found between the low-water mark and the inner mud line. (materials) A highly siliceous sand that contains small amounts of magnesia and alumina, with about 8% of its bulk in powdered coal or charcoal; dampened with water to make foundry molds. (petrology) Sandstone composed of greensand with little or no cement. 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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But now we may read in the Supplement to Lyell's 'Manual,' published in 1858, clear evidence of the existence of whales in the upper greensand, some time before the close of the secondary period. |
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