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Minerals & Gemstone 480x104
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Glossary of Terms
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ALL



Sill
Horizontal sheet of igneous rock interjected between rock that was there before the igneous rock was formed. A well-known example is the Palisades Sill on the western side of the Hudson River across from New York City.



The Palisades Sill in New Jersey

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