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Chlorite
Qz
Qz
Qz
epoxy
Qz
Qz
Qz
Qz
Glauco nite
Qz
Qz
Chlorite
0.5mm
Qz
0.5mm
0.5mm
(D)
Locality N4
section 29
AU
AE
15 m
10
5
0 m
FMC
VC
VF
Clay
Silt
Gravel
Sand
Mudstone
Siltstone
Sandstone
(E)
170 m
AU
AE
Locality N1
section 18
AU7
WDDL
Figs. E and B
165m
160 m
Mudstone
Siltstone
Sandstone
VF
FMC
VC
Clay
Silt
Gravel
Sand
Fig. 6. Petrographic thin-section photos show (A) chlorite-coated quartz grains; (B) glauconite between clastic quartz
grains; and (C) iron-ooids in quartz-rich sandstone in the northern study area. (D) Photo and detailed sedimentary log show
the stratigraphical occurrence of beds rich in iron-ooids at locality N4 (measured section 29). (E) A sedimentary log and
photo of glauconite-rich sandstone facies and its stratigraphical occurrence at locality N1 (measured section 18). For locali-
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