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Help Me Identify This Strange Looking Rock


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Where did you find it? Also, is that texture throughout the whole rock or is it just a surface coat? One of the pictures makes it appear like it might just be an orange crust on the surface of the rock. If the surface texture is throughout the whole rock, then I would say it’s a pisolitic limestone (pictures attached).  If it is just a surface crust, then it could be a dried out algal slime, or possibly (depending on where you found it), a caliche crust.  

5DD27346-C518-4A9C-A4CF-A85416B00EA5.jpeg

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Hmm, I posted another update to this earlier today, but it seems to have been lost. So, if that earlier post pops up then this is a duplicate.  In that case, my apologies.

Anyway, upon looking at the rock closer, it looks like the “grains” are not round.  A better option may be a fossilized algal mat (stromatolite).  Imagine a cut or broken section of the attached picture. Does that look about right?

9FAA5735-B386-433C-B86F-AC54E54795B0.jpeg

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