The soil of the Loire valley is mostly made up of a vulcanized chalk called Tuffeau.
It is made up of the remains of bodies and fragments of rock brought down to the sea by rivers as silt.
Aged 90 million years, sediments deposited suffered a downturn that pressure, they were allowed to recrystallization and cementation.
The limestone is the result of this long and slow transformation of sediment into rock by cementing particles together fossils.
Google translation is funny.
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