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enter image description here

It this a stromatolite fossil? If it is, it’s probabaly at least 1 billion years old

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    $\begingroup$ from just one picture from one angle it is impossible to say, it could any number of things $\endgroup$ – John Aug 5 '18 at 4:21
  • $\begingroup$ I wanted to brush the hair from my screen... $\endgroup$ – Jan Doggen Aug 7 '18 at 14:12
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No, it is not a fossil.

This is a sedimentary rock with veins of a stronger material in it.

For example, it could be limestone with veins of quartz, or mudstone with veins of calcite.

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Doesn't look like a stromatolite... The layering would be more intense, more 'crumbled'... Stromatolites form by algae mats and sand layers 'catched' by the algae. After a sand layer, a new layer of algae forms on top of it. Keeping this in mind, your piece looks quite different. I saw dozens of fossil stromatolites and I never encountered one looking like your piece.

Like Gimelist stated, the veins of harder material shouldn't be there, too

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