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RE: Fossilized sea snail with crystallized interior - Lumaca di mare fossilizzata con interno cristallizato.
This is a fossilization, dating back hundreds of years, and is the deposition of the snails of the snail animal under the soil for a long time. Archeologists can know the time period in which this animal lived @ stea90
I think it is about 3 million years ago, because that's the time when the sea was in my area.
Archaeologists use carbon 14 to know the epoch @stea90
I know this, and they can be much more precise. But if I consider that here the sea was present only between 3 million and 2.5 million years ago, the period is that.