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Posted by: Ritva Kurittu (IP Logged)
Date: October 14, 2005 06:28AM

Isn't it a fact, that the sandstone naturally has seashells in it dues to it having been formed at the bottom of the sea?

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Sandstone forms wherever sand is laid down and buried. Usually this is offshore from river deltas, but desert dunes and beaches can leave sandstone beds in the geologic record too. Sandstone does not usually contain good fossils because the energetic environments where sand beds form don't favor their preservation. [geology.about.com]