Page 168 - Carbonate Platforms Facies, Sequences, and Evolution

Fig.
154
best
(Fig.
ginal
8.
Fig. 6.
with a
bidites
4)
in
seamount
top
volumetrically
explained
consist
escarpment
at
by
of
to
more
the
as
Monte
erosive
Bove;
significant
spacing that ranges from
much as
coarse-grained
5
action
their
500 m
fine-grained
calcareous
tur­
cal­
erosional grooves extend from the top of the mar­
the valley between Monte Bove and Monte Rotondo
the lowermost Corniola Formation, and
Massiccio suggests that relatively little erosion of the
bypassing sediment. The basinal sediments found in
minor erosion represented by the grooves is perhaps
below the
sub-parallel
marginal escarpments has occurred. The relatively
to 20 m. These
formations. The absence of debris flow deposits or
of bypassing
careous turbidites in the Upper Corniola and Sentino
submarine talus deposits derived from the Calcare
arrangement is a classic example of a line source of
has been recently eroded. Town of Casali is in foreground.
on
(Fig.
dated
the
consists
bedded,
fragments.
sediments.
of
Close-up
D.M. Bice and K.G. Stewart
foraminifera
7) show
southern
views
These
onlapping
of
Vida/ina
margin
these
Morphologically
sediments
of the
martana,
located at Monte Acuto (Fig. 5).
in
slope off New Jersey (Robb et al.,
similar
Pliensbachian-Toarcian
grooved
Pliensbachian-aged
the
occur
isolated
aged
as
Height from top of seamount to base of exposed escarpment is 250 m. Young normal fault is approximately
erosional
troughs
perpendicular to marginal escarpment. Horizontally bedded Calcare Massiccio is exposed where the marginal escarpment
Rotondo, south face: area within the dashed line is the preserved part of the escarpment and is the basis for the diagram in
fea­
Photographs of preserved portions of the marginal escarpment of seamounts in the Sibillini Mountains. (a) Monte
1983; Farre &
skeletal
coarse-grained sediment gravity flows. The bulk of
escarpments
sediments,
on the basis of ammonites and the benthic
bedded Calcare Massiccio truncated by the eroded
approximately horizontal, massively
fault scarp, which is onlapped by Pliensbachian-aged
crudely
the sediment filling the erosional gullies themselves
tures have recently been observed on the continental
seamount
Ryan, 1985). Smaller versions of these grooves occur
of