Sedimentary Rock Formation

there are fossils of marks scraped into the sand by grass-like plants which are identical to such formations visible today wherever you have windblown dune grass.you do not get this underwater.

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Not necessary. They just need something to cover the sand (or whatever) without disturbing the marks, and then compression and heat to turn sand to sandstone and the covering material to another bit of rock.You could have something like volcanic ash cover the site and then turn to rock above the sand while capturing the imprint even though the sand gets {washed\blown\eroded} away afterward.

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latin for "that which was to be demonstrated" (loose translation)usually used at the end of a mathematical or logical proof.

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and in some cases, Quite Easily Done