Page 262 - Carbonate Platforms Facies, Sequences, and Evolution
P. 262
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It
'
N
'
246
basin's
tc
may
/
t:=3 lagoon
Monterrey
L2J �:����al
calcarenite
be
[J littoral zone
is
platform (Fig. 4)
the
�
100km
Zacatecas
distinct
Smackover-Zuloaga
ZACATECAS
lineaments.
the Chicontepec basin.
from,
Tepexic
Salt
and
by basement palaeotopography.
low-energy shelf
lies
southwestern projection,
� high-energy shoal
[J intertidal-supratidal
in
Formation
the
younger
-Santiago-Novillo
completely along the margin of the Gulf.
probably
which
than,
vicinity
is
filling
trough caused by the San Marcos and the Saltillo
These 'interior' evaporites may be Buckner equiv
Forma
Kimmeridgian but this is not now determined. The
Callovian salt lying in the Burgos Basin to the east.
The earliest shoal
anhydrite fringe of these deposits trends northwest
Monterrey but west of the Lampazos-Picacho high.
tions which are calcarenitic. In northeastern Mexico
a regional study by Oivanki (1974) of the Zuloaga
oolite facies is developed around the southern edge
Oxfordian strata consist of
the
Jurassic carbonate facies are also influenced locally
Callovian age and occurs locally in central Mexico in
a
alent and may lie shelfward of extensive oolite shoals
up the Sabinas Basin and the halite facies lies in the
of
of
limestone indicated that the widespread Smackover
of the Coahuila block and to the north of the Valles
J.L.
by
Wilson
occurs
occurs
islands
(Meiburg
in
Farther
ammonites.
redbeds
south
south
to
et a!.,
and shoal
and
basinal
the
and dark argillaceous
1987)
areas
is
gypsum.
in
The
(1974, fig. 10).
thinner,
areas (Sansores &
between
Kimmeridgian beds
Tuxpan-Golden
lower
more
Lane
complexes
northern Mexico. From Oivanki
and may be Kimmeridgian. It is overlain by identifi
Fig. 4. Oxfordian-Kimmeridgian .
Girard, 1969).
high.
It is not yet clear whether the Zuloaga around the
dated or may be in part Kimmeridgian. To the south
of Galeana, around Aramberri, two limestones may
Saltillo-Monterrey area is Oxfordian as traditionally
be seen down the flanks of a local high area separated
the Gulf of Mexico in which shoal oolite, calcarenites
or patch-reefs occur in shallow water over high areas
(Taman-San
Andres-Haynesville) form a facies complex around
The southern part of the Tamaulipas arch breaks up
into an irregular mosaic of island topography which
or purely micritic limestone
of
These islands may be surrounded by oolite (Fig. 5).
restricted
limestone
be Oxfordian. The thick upper unit is more oolitic
able La Caja-La Casita shales with Kimmeridgian
marine and tidal flat in character, and is presumed to
facies map of Zuloaga Formation in
On the northern edge of the Tezuitlan massif in