[MadMax, the Grinning Reaper]

Re “Looks like marble which means it can’t be that old”.

Sorry, it would exactly the opposite, esp. depending on whether it is very old marble or another form of limestone (softer, due to precipitation in an ocean, shallow sea, lake, etc). Much of the very ancient US, up to the end of the dinosaurs about 65 million years ago, was under water (i.e. the Great Salt Lake/Bonneville Flats, Dinosaur National Park, the Badlands, Green River formation (full of fish fossils), etc).

Marble is actually pressured limestone, often due to it being broken up and reformed under tremendous deeps of material and heat.

Limestone can come from the erosion of earlier limestone formations or marble, which is often precipitated by micro-fossils including foraminifera, globogerinua (sp. is off), life forms, etc.

Give it the old “acid tests” and find out what its chemical composition is. That will be a good clue as to how old the “rock” is and maybe where it came from.

Otherwise, I suspect a bored Spaniard with a couple of good chisels and time on his hands.

[AlmaKing]

Thanks for the info. I wouldn’t know any of that since I’m a trained geologist.

[Lee Enfield]

That reply is some deep schist. It rocks.

[mad_as_he$$]

Facebook of the time.

[Albion Wilde]

I suspect a bored Spaniard with a couple of good chisels and time on his hands.

That, or an American Indian who was apprenticed to a Spanish man. Looks like a grave marker.