Page 165 - Carbonate Platforms Facies, Sequences, and Evolution

are
the
ally
basins.
water
formed
Kinzie,
as well
partially
martana
<
lamellae,
from the
as
locally
limited
normal faults.
Cecca et al.
marginal
(Fig.
20 m
1976).
in the
to
upper
Monte
9b),
the
The
deep
part
micritized,
nucleated
(1981) to
Ooids also occur in the
on
distribution of seamounts and
but others have
complex system of intersecting
Fault pattern suggests a
ensuring
of the
(Wells,
the Sibillini Mountains, showing
Rotondo,
euphotic
Pliensbachian
Fig. 4. Simplified geologic map of
presence
the
as
obscuring
of
and
zone
1957;
lowermost
distinctive
0
the
shown
that these
and
were
these
Bugarone.
ostracodes
in
do
At
not
suggest that the top
ooids
lamellae
that
corals
Fig.
Buddemeier
best
reworked from the underlying Calcare Massiccio.
corals are hermatypic, colonial forms that are gener­
in
&
typical of t he Pliensbachian ( Centamore et al., 1971).
and
Ammonitico that was deposited on the upper part of
were
presence of corals encrusting the Tithonian Rosso
simply
led
Monte Cucco (previously studied by Passeri, 1971),
Bugarone from
slope of an isolated seamount. These
Some of these ooids are nucleated on tests of Vida/ina
of this
9a.
concentric
Sassotteto (Fig. 4), Cecca et al. (1981) reported the
Monte
are
There are also a number of relevant observations
a
and
been
found
The
basinal
small
5 km
Isolated carbonate seamounts,
both
bedded
reef
facies
observed
Italy
healthy buildups.
is
cherts.
Pliensbachian
structure
hermatypic
No
on
(Colacicchi
Cretaceous-Paleocene pelagic carbonates
and
Jurassic basinal facies (complete sequences)
the
represented
through
commonly dolomitized at its base.
et al.,
by
top
13°20'
reader is referred to Centamore et al.
early
of
the Tithonian seamount-top sediments.
shallow-water
the
The seamount facies of the Maiolica
ahermatypic
1970),
an
observable, dashed where inferred on basis of facies changes.
Jurassic seamount facies (condensed and reduced sequences)
but
fauna
corals
it
as the Upper Tithonian. At other locations through­
formations (Fig. 3). Brief descriptions of the litho­
has
(1971) for a
facies of these formation are given in Fig. 3 and the
seamount was at very shallow-water depths as late
Cretaceous
Sentino, Rosso Ammonitico, Diaspri and Maiolica
al. (1979) described Kimmeridgian corals that form
isolated
Mariotti et
in
and Monte Cucco (Fig. 5), Nicosia & Pallini (1977)
seamount north of Terni (see Fig. 1), but in most
consists of white carbonate mudstones with nodular
out the northern Apennines, including Monte Acuto
formation
cases, these seamount corals did not form typically
is
Corniola,
Approximate trace of Jurassic normal faults drawn as solid lines where
151