Page 145 - Carbonate Platforms Facies, Sequences, and Evolution

sw
ated
A
Aubenas.
by
Toarcian
reefs. A to
formation
Rosie res
a
outer shelf), 3 =
(Fig.
sandy
sharp
24).
by the occurrence of
on the Bose Formation.
oolites, 4 =
erosion
B
biocalcarenite
surface
a small graben,
and
c
(Upper
the
Toarcian) resting on Le Bose Formation (2) (early
Latour
Petit Fm (1) (Upper Sandy-Calcareous Series, late
Sinemurian). Very irregular contact. Les Tardieux near
Sandy­
wackestone texture. The Bose Formation is trunc­
Fig. 24. Penecontemporaneous erosion. Calcaires du Riou
Upper
lOOm wide,
filled with Domerian biomicrites bearing abundant
Calcareous Series) directly overlies the Lower Liassic
quartz grains and limy pebbles, and resting directly
Tectonic control is evidenced
regular and more calcareous beds, characterized by
D
cendres Formation; S2). 1 = mottled limestones (inner shelf), 2 =
25).
ded
ENE).
oriented
nautiloids
Tectonic
within
E
Late Triassic and Jurassic platforms,
G: localities indicated in Fig. 22. Adapted from Elmi et al. (1987).
and
parallel
Au benas
France
F
controls
to
Domerian beds
crinoidal
Ammonites,
are
the
marls and limestones with ammonites (outer shelf or basin), 5 =
belemnites,
faults (b) appearing as diaclases.
also
limestones.
boundary
drifted
(amaltheids,
The
from
G
faults
documented
the
Fig. 25. Fissures and neptunian dykes. La Clapouze
NE
pebbles
by
Fig. 23. Profile through the Aubenas Sub-basin during the early Hettangian (lower member of the Calcaires noduleux
cut by a network of synsedimentary fractures and small
bivalve-coquinas and bioclastic limestones (shallow
(WSW­
of conglomerates made of quartzite pebbles embed­
marls (protected areas), 6 =
is situated at the southern toe of the Escrinet Swell,
along the La Clapouze-La Conchy outcrops (Fig.
occurrence of 'neptunian dykes'. The best example
lytoceratids),
(Vaumalle Formation) consist
are
133
open
the
outcrop near the Escrinet Pass. Domerian breccias (a) are