0.0
0.55
1.10
1.65
2.20
2.75
3.30
3.85
4.40
4.95
5.50
Two-way traveltime (s)
NNW
SSE NNE
SSW
Sites 812, 814, 813 (equivalent)
Site 818 (equivalent)
Site 817
Schematic sectiontownsville trough trasect
Basement/P2
metasediments
0
30 km
Townsville trough
V
H
= 32
–
Upper middle miocene
Lower Miocene
Eocene/Oligocene
Paleocene
Syn-rift
section
Syn-rift
section
Marion plateau
Sites 816, 826
Site 815
P
Platform
“debris”
facies
Paleocene
Basement/P 2
metasediments
P = Carbonate platform
?
?
NNW
SSE
Townsville trough transect
Site 812
17Њ 48.842’S
149Њ 36.317’E
Site 814
17Њ 49.985’S
149Њ 30.831’E
Site 814
17Њ 49.985’S
149Њ 30.831’E
Site 818
18Њ 3.767’S
150Њ 2.533’E
Site 817
18Њ 9.493’S
149Њ 45.510’E
Site 815
19Њ 9.034’S
149Њ 59.516’E
Site 816
19Њ 11.915’S
150Њ 0.606’E
Site 826
19Њ 13.530’S
150Њ 0.597’E
0
100
200
300
400
500
600
700
upper Mioc.-Pliocene Pleist.
middle Miocene (?)
middle Miocene
middle Miocene
upper Miocene
upper
Mioc.
upper Pliocene
upper Pliocene
upper Pliocene
lower Pliocene
lower Pliocene
upper
Plioc.
upper
Plioc.
upper
Mioc.
lwr. Plioc.
lwr. Plioc.
upper
Mioc.
Depth (mbst)
Pliocene
Pliocene
Pleistocene
Pleistocene
Pleist.
Pleist.
Pleist.
Pleist.
Pleist.
wash
middle Miocene
middle Miocene
uppermost lower to middle Miocene
upper Miocene
lower to
mid. 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
?
b
Great Barrier Reef: Origin, Evolution, and Modern Development, Figure 4 (a) Cross section of the Queensland trough and the
stratigraphy of ODP drill holes across the trough; (b) Cross section of the Townsville trough and stratigraphy of ODP drill holes across
the trough.
512
GREAT BARRIER REEF: ORIGIN, EVOLUTION, AND MODERN DEVELOPMENT