Page 305 - Carbonate Platforms Facies, Sequences, and Evolution

/
/
24)
the
can
I
(Fig.
V'tzc
1984;
stage.
/
The
1988).
bonate
be
I
Ar 4
and
/
/
38;
Mondejar,
1o I
/
Limestones
relative
Rat,
I
middle-late
1979;
sedimentary sectors
o
considered
banks and the
karstification
Sttvc L. 'No R tu,.,
\
are best
1959;
Albian
\
on
\
=
Wiedmann
Garcfa-Mondejar et at. ,
\
\
\
et
' R o u Gf;
"
some
'
NOR THERN
representative
Feuillee,
transition
represented
al. ,
'
of
'\
"
'
. \
in
Aralar platform
\
a
1967;
"\
1983;
"
'
the
brought
carbonate
"
'
PLATFORM
"
'
Garcia­
(Fig. 22). That event was coincident with the appear­
north­
In the eastern part of the region some car­
were the result of the same transgression (Fig. 38).
erosion in the continental environment (Figs 22 &
Pascal,
1987; Badillo et at. ,
western part of the basin (Ramales platform). In the
highstand
limestones
(Fig. 18). A subsequent transgression deposited the
last Urgonian limestones in the south of the basin
sea-level fall that occurred towards
about
highs
ance of the Black Flysch trough in the northeast area
-----
close
erally.
The
/
present
narrow,
to
(Fig. 38).
---
The
Black
and probably
/
/
/
and an
1000 m
outcrops
/
Aptian-Albian carbonate episode, Spain
in
-----
/
Badillo et at. , 1988).
Flysch
/
presence
the
/
\
\
/
NW
of
SO
emergent
/
transgressed
/
trough
/
western
was
/
on to
/
Baquio talus
X
/
(Garcia-Mondejar
(Mega breccias)
and
the
NE
filled
SE
et
coarse-grained
Mundaca
talus with some megabreccias in the southeast face each other. After Garcfa-Mondejar & Robador (1986-87).
Ebro
6
at. ,
central
mainly
Fig. 37. Palaeogeographic reconstruction of the Bermeo trough, placed between the Guernica and Northern Platform
practically filled with tidally influenced, deltaic sedi­
lat­
(see Fig. 34). A slope apron adjacent to a margin of escarpment-type in the north and a depositional
land to the north of the
283
1987;
shelf and a belt of alluvial fans, both probably very
northern margin suggests the existence of a marine
(Fig. 24), where, because of the NW-SE extension,
areas
The maximum thickness of the U4 sequence was
sandy and muddy storm-influenced shelf developed,
ments (Pujalte & Monge, 1985). And, in the east, a
centre of the basin the former Bilbao trough was
turbidites and distal deltaic deposits on its adjacent
proximal
massif
the Soba and Bilbao troughs were still two axes of