It is necessary to compare together every thing of this kind which
occurs; it is first necessary to ascertain the fact of their being a
prior and posterior formation of strata, with the mineral operations
for consolidating those bodies formed by collection of the moveable
materials; and, secondly, it is interesting to acquire all the data we
can in order to form a distinct judgment of that progress of nature in
which the solid body of our land is alternately removed from the bottom
of the sea into the atmosphere, and sunk again at the bottom of the sea.
I shall now transcribe what M. Schreiber has wrote in relation to
this subject. It is in a memoir concerning the gold mine of Gardette,
published in the Journal de Physique.
"Avant de quitter la montagne de la Gardette qu'il me soit permis de
rapporter une observation qui peut-etre n'est pas denuee de tout
interet pour les naturalistes; je l'ai faite dans une galerie a environ
cinquante-trois toises a l'ouest du principal puit laquelle a ete
poussee sur la ligne de reunion de la pierre calcaire, et du granit
feuillete ou gneiss pour fonder le filon dans cet endroit.
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