Personal Narrative Of Travels To The Equinoctial Regions Of America During The Years 1799-1804 - Volume 1 - By Alexander Von Humboldt And Aime Bonpland.
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In The
Same Manner As Sulphur And Coal Belong To Periods Of Formation Very
Remote From Each Other, The Sal-
Gem is also found sometimes in
transition gypsum,* (* Uebergangsgyps, in the transition slate of
White Alley (l'Allee Blanche), and between
The grauwacke and black
transition limestone near Bex, below the Dent de Chamossaire,
according to M. von Buch.) sometimes in the Alpine limestone,* (*
At Halle in the Tyrol.) sometimes in a muriatiferous clay lying on
a very recent sandstone,* (* At Punta Araya.) and lastly, sometimes
in a gypsum* posterior to the chalk. (* Gypsum of the third
formation among the secondary gypsums. The first formation contains
the gypsum in which are found the brine-springs of Thuringia, and
which is placed either in the Alpine limestone or zechstein, to
which it essentially belongs (Freiesleben Geognost. Arbeiten tome 2
page 131), or between the zechstein and the limestone of the Jura,
or between the zechstein and the new sandstone. It is the ancient
gypsum of secondary formation of Werner's school (alterer
flozgyps), which we almost preferably call muriatiferous gypsum.
The second formation is composed of fibrous gypsum, placed either
in the molasse or new sandstone, or between this and the upper
limestone. It abounds in common clay, which differs essentially
from the salzthon or muriatiferous clay. The third formation of
gypsum is more recent than chalk. To this belongs the bony gypsum
of Paris; and, as appears from the researches of Mr. Steffens
(Geogn. Aufsatsze 1810 page 142), the gypsum of Segeberg, in
Holstein, in which sal-gem is sometimes disseminated in very small
nests (Jenaische Litteratur-Zeitung 1813 page 100). The gypsum of
Paris, lying between a cerite limestone, which covers chalk and a
sandstone without shells, is distinguished by fossil bones of
quadrupeds, while the Segeberg and Lunebourg gypsums, the position
of which is more uncertain, are characterized by the boracits which
they contain.
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