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Les Tétines de Vernon
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Monticules rocheux affleurant sur le sol de grès.
La partie sommitale de l'ensemble des couches de grès présente une forme d'érosion en téton.
Plusieurs hypothèses tendraient à expliquer ce phénomène particulier, l'une d'entre elles étant que le ciment des grès serait plus riche en silice au niveau des tétons que sur le reste de la dalle.
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