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siltstone |
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siltstoneHardened sedimentary rock that is composed primarily of angular silt-sized particles (see silt) and that is not laminated or easily split into thin layers. Siltstones, which are hard and durable, occur in thin layers rarely thick enough to be classified as formations. They are intermediate between sandstones and shales but are not as common as either. siltstone [′silt‚stōn] (geology) Indurated silt having a shalelike texture and composition. Also known as siltite. 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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Just centimeters away, the ancient siltstone preserves a so-called resting trace, the impression of a creature's belly and its splayed hind limbs. David Hsu, one of the city's top geologists, said the slide followed a classic pattern: Water seaped slowly through the fill dirt used to build these homes 30 years ago, but it was unable to penetrate the siltstone bedrock below. Coincident gold, arsenic, antimony and bismuth soil geochemical anomalies are located along the contact between the Sprague Creek quartz monzonite and Rabbitkettle Formation calcareous siltstones which has a well developed calc-silicate skarn, developed over a 2. |
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