OFR 151.pdf - CRC LEME

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1. Otway Basin Limited data (Macphail and Hos 1990, A.D. Partridge pers. comm.) indicate that uplands bordering the eastern Otway Basin were covered with Austral Conifer Forest dominated by possible pteridosperms (Alisporites), araucarians (Agathis/Wollemia) and podocarps (chiefly Podocarpus-Prumnopitys, Microcachrys). The only commonly recorded cryptogams, which are presumed to have formed coastal vegetation or lined inflowing rivers, were Gleicheniaceae and Cyatheaceae (Cyathidites, Trilites). Proteaceae (Proteacidites) become common and occasionally dominant during the Santonian although the majority of specimens are small (
4.2.7 Tasmania 1. Bass Basin Turonian-Santonian microfloras are preserved in the Durroon Sub-basin, then lying at a palaeolatitude of about 77 0 S off the north-east coast (Partridge 1999, M.K. Macphail and A.D. Partridge unpubl. data). These are dominated by araucarians (chiefly Agathis/Wollemia) podocarps (Podocarpus-Prumnopitys) and Cupressaceae (Cupressacites). Values of the last taxon increase up-section (possible due to the Neves Effect) as do the relative abundance of angiosperms and a distinctive freshwater alga, Rimosicysta. Nevertheless, the cryptogam and angiosperm flora appear to be less diverse that in correlative microfloras from the Gippsland and Otway Basins. Inferred climate The combined data point to seasonally cool-cold (microtherm range) and wet (humidperhumid) conditions in northern Tasmania although it is difficult to determine whether floristic impoverishment reflects freezing temperatures or prolonged darkness during winter. 4.3 Other records 4.3.1 South-East Australia A Turonian ammonite from the Otway Basin yielded a palaeotemperature of 28 0 C (megatherm range) although the associated foraminifera appear to represent a cold-water fauna (references in Dettmann 1973). 188
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CRCLEME Cooperative Research Centre
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Electronic copies of the publicatio
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and, for Tertiary continental seque
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2. Analysis of a Plio-Pleistocene l
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Table A (cont.) Basin and related s
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Figure A: Generalised climatic curv
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Carpenter, R.J., Hill, R.S., Greenw
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Hill, S.M., Eggleton, R.A. and Tayl
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Macphail, M.K. and Stone, M.S., 200
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Swenson, U., Backlund, McLoughlin,
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EXECUTIVE SUMMARY This review prese
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Temperature Climates in palaeo-sout
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SUMMARY OF INFERRED CRETACEOUS PALA
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INTRODUCTION Mineral resources, whe
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Professor B. Balme (Geology Departm
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Section 7 (Tertiary climates) This
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vegetation. Moreover, individual ta
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1.3 Flora, vegetation and climate 1
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TABLE 2: Classification of vegetati
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Figure 2: Relationship of different
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Accordingly, only at sites with exc
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2.1.3 Palaeoecology Palaeoecology i
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wind-pollinated trees and shrubs bu
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1. The usual practice of equating t
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1. Palaeontological evidence Like p
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5. Facies architecture and lithostr
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Subsequent developments include mel
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SECTION 4 (GEOGRAPHIC BOUNDARIES AN
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SECTION 5 (EARLY CRETACEOUS CLIMATE
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events on other continents and sugg
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If these considerations apply to th
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surrounding basins. Thick sands ero
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Haig and Lynch 1993, Erbacher et al
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SECTION 6 (LATE CRETACEOUS CLIMATES
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has highlighted the roles played by
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6.4.2 Palaeobotany Cenomanian flora
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Palaeo-southern Australia Dryland c
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6.7 Time Slice K-6. Late Campanian-
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7.1. Global backdrop SECTION 7 (TER
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Explanations for the PETM are centr
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East Antarctica and strengthening o
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amplifying, pacing and potentially
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southeastern Australia than elsewhe
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7.4 Time Slice T-1. Paleocene [65-5
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Palaeo-southern Australia Unlike no
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Palaeo-central Australia As for the
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7.6.2 Palaeobotany The palaeobotani
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Zone microfloras imply temporary wa
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in the Bass Basin, the basal Seaspr
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Similarly it is difficult to summar
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However, the data are emphatic that
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margin of plateau were cooler (~7 0
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fossil taxa that are morphologicall
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during Late Pleistocene glacial max
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SECTION 8 (CONCLUSIONS) Climatic in
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• On present indications, Early C
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TABLE 8a: INFERRED CRETACEOUS PALAE
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8.2 Results in prospect (recommenda
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The 10 μm sieved, oxidised extract
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phenology. The method also provides
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SECTION 9 (REFERENCES) Acton, G.D.
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Ashley, P.M., Duncan, R.A. and Feeb
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Birks, H.J.B. and Gordon, A.D., 198
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Burnham, R.J., 1989. Relationships
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Clarke, J.D.A., 1994. Evolution of
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Dettmann, M.E. and Playford, G., 19
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Evans, P.R., 1970b. Palynology of H
Page 138 and 139: Godthelp, H., Archer, M., Cifelli,
Page 140 and 141: Harris, W.K., 1974. Biostratigraphy
Page 142 and 143: Hill, R.S., 1994b. Nothofagus smith
Page 144 and 145: Holland, S.M. and Patzkowsky, M.E.,
Page 146 and 147: Australia: paleoceanographic implic
Page 148 and 149: Lindsay, J.M. and Harris, W.K., 196
Page 150 and 151: Macphail, M.K., Colhoun, E.A. and F
Page 152 and 153: McGowran, B. and Beecroft, A., 1985
Page 154 and 155: Morgan, R., 1977. Palynology of Ter
Page 156 and 157: Abstracts of the Annual General Mee
Page 158 and 159: Raymo, M.E., Grant, B., Horowitz, M
Page 160 and 161: Sereno, P.C., 1999. The evolution o
Page 162 and 163: Taylor, G., 1998. Prediction of mod
Page 164 and 165: Webb, L.G., 1968. Environmental rel
Page 166 and 167: Zachos, J.C., Stott, L.D. and Lohma
Page 168 and 169: APPENDIX 1 CRETACEOUS DATA 167
Page 170 and 171: 1. TIME SLICE K-1 Age Range: Berria
Page 172 and 173: Australian assemblages, located on
Page 174 and 175: 2. Officer Basin Dinoflagellates in
Page 176 and 177: 2. TIME SLICE K-2 Age Range: Aptian
Page 178 and 179: Inferred climate The combined data
Page 180 and 181: Dettmann et al. (1992) have argued
Page 182 and 183: 3. TIME SLICE K-3 Age Range: Cenoma
Page 184 and 185: 3.2.2 North-East Australia 1. Carpe
Page 186 and 187: 4. TIME SLICE K-4 Age Range: Turoni
Page 190 and 191: 5. TIME SLICE K-5 Age Range: Early
Page 192 and 193: Inferred climate The data indicate
Page 194 and 195: 6. TIME SLICE K-6 Age Range: Late C
Page 196 and 197: Contrary to global cooling trends d
Page 198 and 199: Inferred climate The relatively goo
Page 200 and 201: Inferred climate As for regions to
Page 202 and 203: APPENDIX 2 TERTIARY DATA 201
Page 204 and 205: 1. TIME SLICE T-1 Age Range: Paleoc
Page 206 and 207: also include relatively frequent No
Page 208 and 209: Inferred climate Some differences b
Page 210 and 211: Microfloras preserved in the Lower
Page 212 and 213: subtropical affinities are rare, hi
Page 214 and 215: 2. TIME SLICE T-2 Age Range: Early
Page 216 and 217: Inferred climate Climates appear to
Page 218 and 219: northern New South Wales. The assem
Page 220 and 221: 2.2.5 Central southern Australia Ha
Page 222 and 223: a number of distinctive Proteaceae
Page 224 and 225: Inferred climate The Regatta Point
Page 226 and 227: 3. TIME SLICE T-3 Age Range: Middle
Page 228 and 229: 2. Lake Torrens Basin Abundant leaf
Page 230 and 231: Dominance is highly variable. For e
Page 232 and 233: types (M.K. Macphail unpubl. data).
Page 234 and 235: Dacrycarpus), Euphorbiaceae (Austro
Page 236 and 237: (possibly upper mesotherm) and drie
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Basin) on the Eyre Peninsula (Alley
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explanation is that a warm water gy
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several taxa, which first appear in
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4. TIME SLICE T-4 Age Range: Oligoc
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Inferred climate The southern limit
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The lowest and possibly the oldest
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Dominants include fresh to brackish
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Based on the relative abundance of
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(Morgan 1977, McMinn 1981a, Martin
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common (up to 5-6%) in the middle s
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Polypodiaceae, Palmae (Dicolpopolli
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Strasburgeriaceae. Proprietary info
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Rare taxa which first appear in the
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Correlative microfloras in the onsh
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impression of floristic impoverishm
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(Lophosoria) reached Tasmania befor
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2. Otway Basin Oxygen isotope strat
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5. TIME SLICE T-5 Age Range: Late M
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Casuarinaceae, Cunoniaceae, Elaeoca
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maximum temperature of the hottest
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Nothofagus-gymnosperm temperate rai
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5.2.7 Tasmania Late Neogene sedimen
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