0.00
0.55
1.10
1.65
2.20
2.75
3.30
3.85
4.40
4.95
W
Site 821
Site 820
Site 819
Site 822
Site 823
Two-way traveltime (s)
Eocene/oligocene
Eocene/oligocene
Eocene/oligocene
Pliocene
Upper middle
miocene
Upper middle
miocene
Schematic section–
Queensland trough transect
Site 824
Site
811/8
0
30 km V
H
= 36
Queensland trough transect
WSW
ENE
Site 821
16Њ 38.793’S
146Њ 17.366’E
Site 820
16Њ 38.220’S
146Њ 18.224’E
Site 819
16Њ 37.439’S
146Њ 19.486’E
Site 822
16Њ 25.379’S
149Њ 12.904’E
Site 823
16Њ 36.981’S
149Њ 36.045’E
Site 824
16Њ 26.703’S
147Њ 45.737’E
Site 825
16Њ 30.955’S
148Њ 9.457’E
Site 811
16Њ 30.956’S
148Њ 9.447’E
Site 823
(continued)
0
700
800
900
1000
100
200
300
400
500
600
700
Depth (mbsf)
Pleistocene
Pleistocene
Pleistocene
Upper pliocene
lower pliocene
Upper pliocene
Upper miocene
Upper miocene
Upper miocene
Middle miocene
?Upper oligocene Lower miocene
Pleistocene
Pleistocene
Pleistocene
Pliocene
wash
mid.
Mioc.
?
?
?
?
upper olig.
-lower mioc.
Periplatform deposits
Pelagic ooze/chalk
Sediment gravity-flow deposits
Dolomitic sediment
Dolomite
Unrecovered interval
Skeletal deposits
(packstone, grainstone, floatstone)
Reef deposits
(boundstone, framestone, grainstone)
Clay/claystone
(terrigenous silt plus clay)
Mixed pelagic/hemipelagic deposits
Basement
Unconformity
lwr.
Plioc.
Upper Pliocene Pleist.
a
Great Barrier Reef: Origin, Evolution, and Modern Development, Figure 4 (Continued)
GREAT BARRIER REEF: ORIGIN, EVOLUTION, AND MODERN DEVELOPMENT
511