Page 238 - Carbonate Platforms Facies, Sequences, and Evolution

pure
(from
linking
platform).
Near the
which
them
limestones
to
they
W
both
shelf, the sequences, =
I 'f '<::"' Corals r /} ® M 0 2m / Hard
DB'
P
differ
t Br yozoans CD Q) ..9 :;:: :;:: 0 > Q) _c 0 en Q)
G
ground
the
Algae
0 :::J 0 ..... +- N • • -
Crinoids
IOC as S
through
>- (f) I • • •
-
0
"- ...... (f) I • """'
the
of the late Barremian
Hauterivian
0 � a> I • :[')
�
Q)
O +- 0.. - ...... 0 ·- c U; (f) I • •
uu (J)
0
.A.
1:'
(J) Q) Q) 0.. (f) ::l ..a "'0 0 ..a 0 cnu ..a 0 <f) +- Y }v r:::,
8
£:::,
absence
echinoids, crinoid bryozoan packestone and hardground.
+-
.c 0 = 0 :;:: <f) :::s 0 ..a 0 "'0 0 Q) (f) 0 I 0 <f) <f) • • I I - 0 (j The Jura and northern Subalpine chains
sequences
(.)
edge of the outer slope of the earlier
20 m thick, display features
•
(Urgonian
of
......
I
Large
Sma ll
Oolites
Oncolites
Orbitolina
monly
rudists
packstone
with
M
foraminifera
d'installation';
with
G
.A
�
®
G
irregular
small
0
0
Q)
en
:;::
glauconite) and those of
:::J
I
La rge
I
..
Sponge
�
•
I
I
echinoids;
'--
4--
..a
(f)
0 0 >- '-- (f) ...... N W P ·- I I I I CD Q) I :;:: I 0 > I _c I I Q) I I I :(} --
Q)
I
ou "C
Q)
(J)
"C
'(3
I
Arnaud-Vanneau
:r'XS patang idae
lowstand
rud ists
Stromatolites
0 o.. - ...... 0 c o Q) I I I •
foraminifera,
(J)
"C
(2)
et
spicules
(/) Q) Q) 0.. <f) ::l 1:i "'0 o +- ..a · - 0 cn(J ..a 0 <f) +- <f) +- • • • '( 'f
in
B
.c 0 = 0 :;:: (f) :::s ..a "'0 0 0 (.) � (f) (f) 6 223
al.,
echinoids, crinoid-bryozoan wackestone-packstone with glauconitic grains and cherts, rounded bioclast-oolitic
wedges.
platform (southern Jura). From base to top, nodular argillaceous limestone (mudstone-packstone) containing irregular
display, from the bottom upwards: (1) marls, com­
Fig. 18. Sketches of Hauterivian sequences. (A) Section of the shallowing-upward sequence located above the Berriasian
wackestone­
grainstone with ·cross-bedding and hardground. (B) Section of the shallowing-upward sequence located above the slope of
the Berriasian platform (Vercors). From base to top, interbedded nodular argillaceous limestone and marl with irregular
1987)
decimetric
These
Urgonian platform initiation sequences ('sequence