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Helvetic nappes
The
Helvetic nappes
are a series of
nappes
in the Northern part of the
Alps
and part of the
Helvetic zone
. They consist of
Mesozoic
limestones
,
shales
and
marls
that were originally deposited on the southern
continental margin
of the European continent. During the
Alpine orogeny
they were
thrusted
north over a
décollement
and at the same time were internally
deformed
by
fold
ing and thrusting.
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