Weird rocks/fossils help id?

[gentleone444]

Im hoping these photos show the weird pattern on them. What is it?

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[FC-Treasure]

To me, they look like "trace fossils". In other words, not a true fossilized plant or animal, but the path of a creature as it (slid, burrowed, walked) on (mud, sand, etc). Here is a google image search for trace fossils to give you an idea.

https://www.google.com/search?clien...&tbm=isch&sa=1&q=trace+fossil&oq=trace+fossil

 

[gentleone444]

Ver cool! Thanks for the info!

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[DDancer]

FC has as good an answer as I can think of. Other things like tree roots, insects and erosion or leaching of certain materials in the rock can form those types of lines as well.

 

[Eu_citzen]

Jupp, FC nailed it!