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I agree. You may want to post this in the Fossil forum on here- FossilsI think you will find that they are fossils. Either plant/algae colonies or maybe just a mineral intrusion in some ancient fractures. Look at the second picture in the OP. Someone would have had to carve away the ENTIRE rock face to make the ribs stand out. The "ribs" are harder than the surrounding rock and the surrounding rock has weathered away over the eons.
Waffle Rock or Carpet Rock or variation thereof.
Strange Rock Formations