Can anyone help?

[Retiredlawyer]

I’m curious what would cause this type of texture on this rock? The rock is about 4” wide, so the bumps are about the size of a pencil lead.

 

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[Red-Coat]

It looks like oolitic limestone. It’s formed from small spheres of calcium carbonate that have been deposited onto sand grains and then water-rolled on the ocean floor before becoming compacted into rock with a lime mud matrix.

I couldn’t readily find a comparable photograph that isn’t copyrighted, but if you Google the term you’ll find many examples, including this one:

https://fineartamerica.com/featured...story-museum-londonscience-photo-library.html

 

[Retiredlawyer]

Awesome info! Thank you very much