Page 225 - Carbonate Platforms Facies, Sequences, and Evolution

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210
I
The
clastic
capped
cD • ..
irregular
by
®- ::·: ····· · · · ··
.
LATE
EARLY
[500m km
NEUCHATEL
··
southern
limestone
JURA
'
is
echinoids
Shelf
. . .... . :· . ·. · . : · : · :·:: ··
Pachytraga
Farther to the southeast,
boundary
the Barremian emergence.
LA
mation, with Acanthodiscus
situated
I
rudist
BARREMIAN
HAUTERIVIAN
URGONIAN
PLATFORM
( Toxaster)
::·:: . ·.+:::::= ....
of this
CHAMBOTTE
' · ·· · · ···· ······ · ...
outer
limestone
passing
PLATFORM
or
;;s ,.
along the Isere
up
shelf
bio­
cephalopod-bearing marls (Marne d'Hauterive For­
yellowish bioclastic limestone and oobioclastic lime­
fault.
are overlain by highstand deposits (Pierre Jaune de
Neuchatel) which are arranged in shallowing-upward
in the Dauphinais Basin,
sequences consisting of blue marly limestone with
oobioclastic limestone. This sequence is commonly
white
stone. The late Hauterivian parasequence is locally
radiatus). These marls
truncated at the top or even missing entirely due to
into
I
GRENOBLE
and
and
The
east,
/
a
SUBALPINE
the
Jaune de Neuchatel Formation (bioclastic limestone). Be= Berriasian; EV
last
A. Arnaud- Vanneau and H. Arnaud
lengthwise
PLATFORM
two
Hemipelagic ramp
hemipelagic
DAUPHINOIS
wedge (Figs 7 & 8).
profile
slope
I
of
correspond
GLANOASSE
the
BASIN "-.,
joining
to
the
_.---- Hemipelagic
VOCONTIAN
seafloor
east in the northern Subalpine chains ( =
the deep
1
o
slope
formation; (B) Glandasse bioclastic limestone formation; (C) Berriasian-Hauterivian platform facies; (D) basinal
BASIN
1 ------------------------
EH =early Hauterivian; LH =late Hauterivian; EB =early Barremian; LB-EA =late Barremian-early Aptian.
during
domain
Pelagic
Fig. 7. Schematic palaeogeographic sections between Neuchatel and the southeastern Vercors. (A) Urgonian limestone
S
highstand wedges that prograded towards the south­
Domain, a ramp sloping slightly towards the south­
0m
hemipelagic to pelagic facies. (1) Erosion surface of the Valanginian deposits in the Neuchatel area (Swiss Jura); (2) Pierre
=early Valanginian; LV= late Valanginian;
marl-limestone alternations of the Vocontian Basin.
slope)
thick hemipelagic sequences were deposited in the
part corresponds to the area of bioclastic limestone
part of the Vocontian Basin (5-10° slope). The first
parts: a sub-horizontal submarine surface in the Jura
the
northern Subalpine chains. They correspond to the
late Hauterivian shows the existence of three distinct
hemipelagic
pelagic
changing laterally in the Diois to the pelagic