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FIGURE 6
Lower shoreface muddy sandstones containing ichnological suites consistent with
proximal expressions of the
Cruziana
Ichnofacies and distal expressions of the
Skolithos
Ichnofacies.
(A) A general photo of lower to middle shoreface deposits, with the proximal part of the lower shore-
face near the base of the photo. The red grains are siderite-cemented burrows overwhelmingly domi-
nated by
Ophiomorpha borneensis
. (B) Closeup of part of an
O. borneensis
(
Ob
) burrow network.
(C) Pervasively bioturbated (BI
¼
5) muddy sandstone of the distal part of the lower shoreface, with
Diplocraterion
(
D
),
Asterosoma
(
As
),
Planolites
(
P
),
Phoebichnus
(
Pb
),
Chondrites
(Ch),
Phycosi-
phon
(
Ph
), and
Thalassinoides
(
Th
), recording a proximal expression of the
Cruziana
Ichnofacies.
(D) Laminated-to-burrowed bedding in the lower shoreface. Remnant laminated sandstone at the base
corresponds to a tempestitewith
Macaronichnus
isp. (
M
). The burrowed fair-weather bed overlies the
tempestite and showsBI
¼
5, with
Ophiomorpha irregulaire
(
Oi
),
Skolithos
(
S
),
Chondrites
(inmuddy
interlaminae),
Planolites
(
P
), and
Thalassinoides
(
Th
), attributable to a distal expression of the
Sko-
lithos
Ichnofacies. Scale bar
¼
3 cm.
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