Weird Rock

Oct 17, 2020
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Was making a new compost heap for my folks and struck this weird looking rock about 3ft down. I don't think it's a normal sediemntary rock, at least I haven't seen any around here with deposits like that in it? And it has the odd sratching on the side.

Any opinioms on this?
 

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Aug 2, 2020
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It looks like it contains a fossilized impression of some rugose coral. Whereabouts do you live? Do you know the age of the rocks in your area?
 

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