Page 291 - Carbonate Platforms Facies, Sequences, and Evolution

ssw
ESE
272
(1979).
rupted
margin
ESCUDO
produced
r
�
10m
by
Q
D
E23
D
�
�
a
L 500m
at
Marls
local
(
tt:
4 Km
Mudstones
Sandstones
Limestone s
least
___
Sandstone s
Depositional
Reef- mounds
.�:::::::�:=:��:::����Jix-z i�.L--
and
[[]] Rudistid limestone
one
limestones of the
� Mineralize��� mestone
_____,.
Sequences
canyon-like
___._
COTEAO
...-
regressive
� ������ r
boundaries
u1
U�
U�
conQiome•oles U� :
U� :
surface
:
Ramales area
in
� Coral limestone
Early
pulse,
limes tone
J.
:L.Aplion
uk :U.Aptian
U. Albian
(Fig.
ESTACAS
U� : Late l.Aibian
�.-'--'I�
Lote M. Albian
M. Albion
wide areas. The history of the sequence was there­
after the history of a transgression. This was inter­
platform
grained sediments associated with fan deltas covered
which
23),
: U.Aptian-L.Aibian
� Erosion surface
later
r:::AJ Old mine entrance
Garcfa-Mondejar
�--25m�
LUNAOA
and U3 2 .
filled
WNW
also resulted in
with
RIO ASON
(1982).
sandstones.
This
marls above the limestones
regressive
of platform limestones of the
Fig. 25. Erosional surface with
u I-u4 refer to depositional sequences and U21- U/ to depositional sub-sequences. Modified from Garcfa-Mondejar
ALISAS
Fig. 24. Stratigraphic cross-section of the Urgonian in the Valnera area (west of the region) restored to the base of the
an outcrop near Bilbao). Draping
correspond to sequence U2. After
palaeochannel morphology on top
Supra-Urgonian. From south to north fluvial, mixed platform, deltaic, reef and basin major environments are represented.
Bilbao sedimentary sector, Fig. 23). This pulse per-
NNE
a correlative sandstone a · nd mega­
Garcfa-Mondejar & Garcfa-Pascual
the first Urgonian sequence, U�> in
breccia interval in the basinal area of Soba (western
pulse
Galdames Formation (upper part of
mits the division of u3 into the sub-sequences U3 1
.