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Chert
"waves" in the red-violet and greenish calcschists
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Walking up to the Mt. Fiocca
along the Fatonero stream, you can discover in a rock succession – from
the oldest to the youngest ones – marbles (m), cherty limestones
(cs), cherts (d), metalimestones with cherty bands and
nodules (cse), calcschists and sericitic phyllites (sc)
and the quartz-feldspatic metasandstones (pmg).
Due to the folding structure you can cross this same succession more
than once.
On the geological map below, you can read the rocks distribution in this
area (see the labels in brackets in the map) as well as it also
underlines the presence of three tiny klippen of “Cavernoso”
limestone (cv).
However, the Mt. Sumbra however, consists mainly of marbles (m)
and cherty limestones (cs).
Useful
information on the age of this rock succession can be achieved by the
presence of fossil ammonites from the Lower Jurassic (Sinemurian-Toarcian)
in the cherty limestones of Mt. Fiocca (Fatonero locality).
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