Page 99 - Carbonate Platforms Facies, Sequences, and Evolution

in
90
by
the
the
(Cal
been
The
the
c
.�
z
c
-'
<
-'
.
c
-'
z
. .,
.
0
:>
•
�
()
�
regions
a:
<>
<>
�
�
way
(Hirsch,
Daonella
J:
:I;
:f
:I;
:>
()
(/)
a:
<
w
:>
"
-'
"
w
w
a.
"
-'
Benifallet
dolomites;
dolomites;
of
Prades
divided
show
Upper
(2)
1976;
conodonts
(3)
stratigraphically
Unit;
lommeli
into
SW
base to the top are:
(3)
Domain
contrast,
March,
five
can be divided into five
Gaia-Montseny
important
La
Querol
the
the
and shales with Daonella;
(Virgili,
present in all the Domains.
Muschelkalk
lowermost
units:
Sephardiella
1986),
units:
Baix
Riba
facies
has
Upper
Domain
1958;
and
F.
units
carbonate
reefs;
been
Benifallet bioturbated
middle part of the Upper Muschelkalk
the
Domain
stromatolites;
which,
(1) Rojals
(4)
mungoensis
facies
differences
(Fig.
Marquez,
Ebre -Priorat
(Rojals
divided
and
Muschelkalk
from
Unit;
in
of
Capafons dolomites, marls, shales and breccias.
Calvet, M.E.
12).
( 4) Tivissa limestones­
(1) Rojals oolitic limestones­
limestones­
the
vet et al., 1987). Four units have been recognized
(2)
(1) Rojals Unit; (2)
The Rojals and Benifallet Units are probably Lower
Benifallet) and the uppermost unit (Capafons) are
Alcover
and Pseudofurnishius murcianus Van den Boogaard
the
The age of the Upper Muschelkalk is Ladinian.
Ladinian. The Rasquera Unit is of Upper Ladinian
the
has
various units (Figs 12 & 13) in the different domains
In
and
dolomites and shales; and (5) Capafons Unit. The
1983),
ammonoids
into
Baix Ebre-Priorat Domain the Upper Muschelkalk
age, as determined by the presence of the bivalve
Diebel
Benifallet Unit; (3) Rasquera limestones-dolomites
(4)
laminated dolomites; and (5) Capafons Unit. In the
(3)
The
The
with
areas,
a
consists
secatus,
present.
a
panicum,
Prades
Tucker and J.M.
of:
Rojals
tidal-channel
Capafons
Prothachyceras
more
(1)
fill
Domain
lenticular
Unit,
Henton
planar-laminated
Hungarites
Unit
and
Praecirculina
oolitic
muddy
6-17 m
sand
Steinmann,
granulates (Sole et al., 1987).
pradoi,
morphology
Fig. 12. Stratigraphical cross-section through the Catalan Basin during Upper Muschelkalk times.
granifer
thick,
shoal
etc.
corresponds
Rojals oolitic limestones-dolomites
and
with small-scale cross-stratification
grainstone,
and
stromatolites.
Domain
mixed mud-sand fiat deposits (2 and
to
Gaia-Montseny
unit
varies
marked by a 0·1-0·2m thick marl level.
This
3).
deposit
the
shallowing-upward
(Virgili,
0· 2-2 m
erosional
NE
In
Prothachyceras
from
(1)
unit
creasing in set size towards the top. This facies
and herringbone and large-scale cross-bedding de­
his­
and fiaser bed­
thinning­
is
interpreted as a shallow-marine high-energy deposit,
thick,
base,
facies is interpreted as intertidal, and passes up into
and
and it is overlain by (2) oolitic-bioclastic packstone
ding, and wackestone with lenticular bedding. This
Unit. In some areas a bed thinning-upward sequence
Ladinian, as dated by the presence of Camerosporites
Duplicisporites
1958).
Upper
sandstones. The upper boundary is a sharp contact,
mudstone to oolitic grainstone and locally contains
lime
other
is
upward sequence (Figs 13 & 14) is interpreted as a
Two different sequences are present in the Rojals