Page 191 - Carbonate Platforms Facies, Sequences, and Evolution

1
be
for
*
large
of
fossils
found
(
stones
� of
jurassica
some
are
mudstones
such
of
within
• AMARAL
in metres
Lower,
as
� charophyte
diceratid
" ����c\�f��
D Tubip...byk�
"
Kimmeridgian).
[[]] ABADIA FM.
suggest
Abadia fm.
the
� TOJIERA MB.
FM.
or
L:.:::2j and grainstones
(Westerhausen,
lime
them
situated
probab)y
I
I
that
b ";'� t � cia
to
rudists
even
D & fenestral (F) horizons
not
D
below 1956)
(j; depth of top Montejunto
surface
wackestones
� CABACOS FM. bituminous
the
limestones
mudstone
strongly
Campbelliella
Upper
middle
ammonitic lime mudstones and
,•'''''" cora l
(Diceras
CSJ lntraclastic /bioclastic packstones
present.
rERTIARY
(P.W.
ostracod
� nerineid wackestones & packstones
striata
Lime mudstone and wackestones soils
suggest,
and
I LOURINHA FM
southwest,
=-===.faults
(S)
and
biostrome
but
Skelton,
Kimmeridgian
J TORRES VEDRAS FM.
some
Therefore,
do
Kimmeridgian
it
lime­
comm.). The apparent absence of diagnostic micro­
pers.
may
prove, an age no older than Lower Kimmeridgian
shelf carbonates are coeval with the ammonitic lime
probable that although much of the shallower-water
Epidiceras)
(Guery, 1984, suggested an age range up to middle
not
is
age
Clypeina
=
the
stones.
Upper Jurassic carbonate buildups,
To
(Ruget-Perrot,
Montejunto
the
the Montejunto"cforination. Post-Montejunto outcrops are taken from Zbyszewski et
Portugal
1961).
buildup
a/. (1966)
southwest
Description and interpretation
of
Turbiditic
our interpretation of its formation.
summarizing
thonous oolitic packstones and grainstones.
Km
the
packstones
Montejunto,
2
ammonitic lime mudstones are overlain by alloch­
fossils (including Zoophycos) occur within the mud­
Fig. 5. Geological map of the area around the Serra de Montejunto showing distribution of carbonate facies associations in
177
Peri platform and basinal facies are represented by
the west and southwest of the Serra de Montejunto
facies changes mapped in the area, and incorporating
Figure 6 is a schematic SW-NE cross-section across
lateral
wackestones, small-scale slump horizons and trace
the
200m of ammonitic lime mudstones exposed to
and