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Hi Jason and welcome to the forum.
I suspect those are natural geological features known as sole-marks, which occur at the interface between two strata in sedimentary rocks where there have been water currents across the sediments prior to lithification. There's a bit more info here:
And here's a pic posted by 'vtbuck223' on another forum that shows these features (also known as flute casts) nicely:
I keep six honest serving-men (they taught me all I knew); Their names are What and Why and When and How and Where and Who.
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