We Never Know
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One can date the strata. It obviously has to be older than the youngest strata, but they are usually dated by specific events. And volcanic eruptions quite often accompany those events. You have heard of the "Ring of fire" that surrounds the Pacific? Where do you think the "fire" came from?
If lava is recycled rock that's been here for billions of years, how does it date different after it was rock, became lava, then became rock again?