Page 253 - Carbonate Platforms Facies, Sequences, and Evolution

0
238
9'"
I
0
�-��and x
0
andesitic
&/
Volcanics
Normal faults
volcaniclastic
Basin depocenters
Ouachita-Marathon
& intrusives
Permo·Penn.c/astics in
Trias-Lias granitoid rocks
trend
Laramide uplifts & thrusts
wells
Pa/eoz. metasedimentary rocks
sediments
& outcrops
with
for detailed list of localities for these rocks).
Fault bounded Late Paleoz &Early Mesoz uplift:;
batholiths and also above them in places. The gran­
late Triassic-Liassic strata as young as late Jurassic
with a basal weathered zone or breccia. (See Table 2
ites are overlain unconformably in some places by
(Nazas Formation) lie to the south and west of these
redbeds
J.L.
.
Zac
\
of
L
•
Wilson
delta
G
.
Chihuahua
genic deposits.
and
the
Coahuila
and lacustrine environments are
block
well
in
Their provenance and alluvial, fan­
the Huizachai-Nazas Unit and are typical taphro­
typical rift-valley sediments are widely known south
basins
known
between horst blocks. These redbeds are grouped as
Rifting began �fter the granitic emplacements and