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We found this rock at a mineral and jewelry store. The gal wrote down what it was and we cannot find what we think she wrote on the internet anywhere. She wrote Mcstrodlite.![enter image description here

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closed as off-topic by Universal_learner, Fred, trond hansen, Jan Doggen, Gimelist Jul 19 at 10:46

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  • "Please review our rock identification guidelines to provide the missing information so that your question is both answerable and useful to new users." – Universal_learner, Fred, trond hansen, Jan Doggen, Gimelist
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You have a nice stromatolite fossil.

A stromatolites are layered bio-chemical accretionary structures formed in shallow water by the trapping, binding and cementation of sedimentary grains by biofilms (microbial mats) of microorganisms, especially cyanobacteria. stromatolite fossils can be some of the oldest fossils found on earth. Living stromatolites can still be found today. (Wikipedia).

This pattern on the underside of a stromatolite fossil is very characteristic. enter image description here

Cretaceous age stromatolite fossils from Morocco are commonly found for sale online. (Esty)

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Looks similar to stromatolite.

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    $\begingroup$ More detail would improve this answer $\endgroup$ – Fred Sep 26 '17 at 17:16

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