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The waters, which are loaded with sulphuretted hydrogen, issue from a quartzose sandstone, lying on compact limestone, the same as that we had examined at the Morro. We again found in this limestone intercalated beds of black hornstein, passing into kieselschiefer. The real kieselschiefer and Lydian-stone have not been observed hitherto except in the transition-slates and limestones.
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