207979
Beschreibung
Mindmap von kara.duncan183, aktualisiert more than 1 year ago
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Erstellt von kara.duncan183
vor mehr als 10 Jahre
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Evolution of Australian Biota
- 220-110 (dinosaurs)
- Aust. still joined to Antarct. cool wet climate semi darkness for weeks in
winter, shallow sea
- Fossils of club mosses, narrabeen shales
- Aust. still joined to Antarct. cool wet climate semi darkness for weeks in
winter, shallow sea
- 45 mya
- Aust. became separate
- Fossils of aquatic organisms (crocodiles found in dry inland
- Aust. became separate
- 20 mya
- Aust. isolated from other continents and drifting northward. Climate was warmer
and wet.
- Tree rings are circular patterns made up of light and dark bands of woody tissues. There are more
bands in summer, rapid growth but no bands in winder. Fossilised trees show this pattern of growth.
- Aust. isolated from other continents and drifting northward. Climate was warmer
and wet.
- 8 mya Continued northward drift,
becoming drier.
- 100 thousand years (megafauna)
- Drifted very close to present day position and decrease sea levels made it temporarily connected to
tasmania and NG by land bridges.
- Drifted very close to present day position and decrease sea levels made it temporarily connected to
tasmania and NG by land bridges.
- 10 thousand years
- Cycles of high and low seas due to freezing and melting of the ice caps, land
bridges forming
- Cycles of high and low seas due to freezing and melting of the ice caps, land
bridges forming
- 5 thousand years
- Present plants show adaptations to harsh dry conditions have leathery leaves.
Open forests, heathlands. No fossil remains have yet been discovered
- Present plants show adaptations to harsh dry conditions have leathery leaves.
Open forests, heathlands. No fossil remains have yet been discovered
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