Lyla Lindsey
Australia has a remarkable history, with the continent evolving and changing over millions of years. Shortly after the dinosaurs died out 65 million years ago, Australia was torn from the supercontinent of Gondwana and began its journey north towards the equator. As the Australian landmass moved, the lush temperate forests of Gondwana disappeared, replaced by desert, grassland, and savanna. The continent became home to unique marsupial megafauna, including giant kangaroos and three-ton wombat-like Diprotodons. Humans first arrived on the continent between 65,000 and 40,000 years ago, with Aboriginal people populating the land and developing a subsistence economy hunting birds, fish, and animals, and harvesting edible plants.
| Characteristics | Values |
|---|---|
| Isolation | Australia was torn from the supercontinent of Gondwana by immense tectonic forces and began its long, lonely, journey north towards the equator. |
| Climate | Australia's climate and landscape resembled a lot of what they do today. The continent became a wide brown land of desert, grassland, and savanna; of droughts and flooding rains. |
| Sea Level | Sea levels were a few meters higher than today. |
| Population | The Aboriginal population spread into a range of very different environments. |
| Technology | Aboriginal people built sea craft strong enough to survive the voyage, a technological feat that went beyond making spears or lighting fires. |
| Economy | Aboriginal people developed a subsistence economy hunting birds, fish, and animals and harvesting edible plants. |
| Diseases | An outbreak of smallpox in April 1789 killed about half of the Aboriginal population of the Sydney region. |
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What You'll Learn
Australia's separation from the supercontinent of Gondwana
Australia's natural history is closely linked to its separation from the supercontinent of Gondwana. The remnants of Gondwana make up about two-thirds of today's continental area, including Australia.
Gondwana was formed by the joining of several large stable blocks of the Earth's crust, known as cratons. This process, known as accretion, began around 800 to 650 million years ago with the East African Orogeny, the collision of India and Madagascar with East Africa. Over time, Gondwana grew to become the largest piece of continental crust of the Paleozoic Era, covering an area of about 100,000,000 square kilometres, or about one-fifth of the Earth's surface.
During the Paleozoic, the present-day landmass of Australia underwent significant geological changes. From 545 to 390 million years ago, shallow warm seas covered parts of central Australia, with volcanic arcs and deep water sedimentation in the east. The Larapinta Seaway extended across the centre of Australia from 480 to 460 million years ago. Cycles of sedimentation and volcanism during this period formed new continental crust, shaping eastern Australia.
The separation of Australia from Gondwana began around 132 million years ago, with seafloor spreading occurring around 96 million years ago. This separation resulted in the formation of the South Tasman Rise, a shallow seaway that developed during the Early Cenozoic. As the oceanic crust continued to separate the continents, global ocean temperatures dropped significantly. The northward movement of the Australian Plate since the Eocene has resulted in the uplift of the New Guinea Highlands and a shift from rainforests to a more arid landscape.
The breakup of Gondwana also influenced the unique flora and fauna of Australia. For example, the plant family Proteaceae, found in all Southern Hemisphere continents, is known for its "Gondwanan distribution". Fossils discovered in Australia, such as those at Lightning Ridge and Murgon, provide insights into the evolution of monotremes and marsupials, with strong connections to South American fauna, highlighting the shared history of these continents as part of Gondwana.
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The migration of Homo sapiens to Australia
Australia has not always looked the way it does now. For hundreds of thousands of years before modern humans arrived, sea levels were lower, and much of Indonesia was land. This meant that it was possible to get pretty close to Australia via land. However, Homo sapiens still had to navigate across large stretches of water to reach Australia.
Homo sapiens originated in Africa and moved to occupy Europe and Asia. They had reached South-east Asia by 70,000 years ago and spread to Australia by at least 50,000 years ago. The earliest evidence of human occupation in Australia is dated to around 65,000 years ago. These early humans belonged to a single genetic lineage and were the descendants of a population that originated in Africa.
The arrival of Homo sapiens in Australia is significant in understanding the history of the country's Aboriginal communities. Previously, it was believed that human arrival in Australia corresponded with the extinction of multiple species and the decline of Neanderthals. However, pushing back the timeframe for human migration indicates that early humans may not have been in direct conflict with other hominids and animals to the same extent.
It is worth noting that Homo sapiens were not the first to inhabit the region. Homo erectus had already been in Asia for at least 1.5 million years, and evidence shows that they interbred with modern humans. Additionally, a second species, the Denisovans, also inhabited the region, and Melanesian and Aboriginal Australian populations carry about 3-5% of Denisovan DNA.
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Aboriginal people's population of the continent
The Aboriginal people of Australia have a long and rich history that dates back thousands of years. They are the first peoples of Australia, with a presence on the continent that predates colonisation.
The ancestors of present-day Aboriginal Australians migrated from Southeast Asia during the Pleistocene epoch, making them among the first in the world to undertake sea voyages. Lower sea levels at the time meant that Australia, Tasmania, and New Guinea were part of the same landmass, known as Sahul. As sea levels rose, the people on this landmass became isolated, with some settling on the Australian mainland and others on Tasmania and smaller offshore islands.
Estimates of the Indigenous population prior to European settlement vary widely, ranging from 318,000 to over 3,000,000 people. The arrival of European colonisers brought a population collapse, primarily due to new infectious diseases such as smallpox, as well as massacres, armed conflicts, and competition over resources.
In the years since colonisation, the Aboriginal population has continued to face significant challenges. In 2021, Aboriginal and Torres Strait Islander people comprised 3.8% of Australia's population, with 812,728 people self-identifying as being of Aboriginal and/or Torres Strait Islander origin. This population is distributed across urban, regional, and remote areas, and while many have adopted English as their primary language, traditional languages and cultural practices continue alongside.
Aboriginal peoples have a strong connection to their traditional lands and waters, with regional identities such as 'saltwater people' for those on the coast or 'freshwater' or 'rainforest' for those in inland ecological environments. They also identify with specific language groups and clans, each with their own unique culture, beliefs, and practices.
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The arrival of the First Fleet
Governor Arthur Phillip, who was in command of the Fleet, rejected Botany Bay as the site for the new colony. Instead, he chose Port Jackson to the north, arriving there on 26 January 1788. This date is now celebrated as Australia Day and marks the establishment of the colony of New South Wales as a penal colony—the first British settlement in Australia. Phillip named the site Sydney Cove, after Lord Sydney, the British Home Secretary.
The First Fleet encountered Indigenous Australians upon their arrival at Botany Bay. The Cadigal people of the region witnessed the arrival of the Fleet, and six days later, two ships of the French explorer La Pérouse, the Astrolabe and the Boussole, sailed into the bay. When the Fleet moved to Sydney Cove, they encountered the Eora people, including the Bidjigal clan. Despite the official policy of the British Government to establish friendly relations with the Aboriginal people, conflict soon arose. The colonists did not sign treaties with the traditional owners of the land.
The First Fleet marked the beginning of convict transportation to Australia, which lasted until 1868. Over 150,000 convicts were transported to New South Wales and other Australian colonies during this period. Most convicts remained in Australia after serving their sentences, and some became influential members of the Australian colonies. The arrival of the First Fleet had a significant and devastating impact on Aboriginal and Torres Strait Islander people, who suffered loss of land, conflict, and the erosion of cultural traditions and languages.
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Australia's involvement in World War II
Australia's landscape has changed over millennia, and the same can be said of its role in the world. Australia entered World War II on 3 September 1939, shortly after war was declared on Germany by Britain, to whom Australia owed allegiance as part of the British Empire.
Prime Minister Robert Menzies announced that 40,000 members of the Militia would be called up for training, and a further 20,000 would form an expeditionary force, the Second Australian Imperial Force (AIF), to serve overseas. In total, nearly one million Australian men and women served during World War II, and close to 30,000 lost their lives. Many more were injured or suffered as prisoners of war.
Australian forces fought across numerous theatres of war, including in Europe, North Africa, the Middle East, and in the Pacific. In Europe and North Africa, Australians fought alongside British forces, with the 6th, 7th and 9th Divisions of the AIF supporting Britain. Many Australian airmen served in the RAAF and the Royal Air Force (RAF).
In the Pacific, the war came closer to home. In 1941, Japan attacked British, Dutch and American territories in Asia and the Pacific, with the aim of controlling the whole region. The 8th Division AIF, along with Australian ships and aircraft, fought alongside British Empire forces in Malaya. In 1942, the 6th and 7th Divisions were ordered back to Australia from the Middle East to fight the Japanese in the Pacific, while the 9th Division remained in North Africa until 1943.
One of the most difficult campaigns of the war for Australia was the battle of Kokoda. A force of 2,000 Japanese soldiers set out to take Port Moresby, trekking along a narrow, steep and muddy track. They were met by a smaller group of Australian soldiers, who, despite battling harsh conditions and exhaustion, managed to stop Japan from taking control with help from local Papuan people and additional troops. For the next three years, Australians continued to fight in the Pacific and in Europe and the Middle East until the tide turned against the Nazis and then Japan.
The Second World War had a profound impact on Australia and its people. Women played a significant role, enlisting in the armed forces for the first time and taking on a variety of roles, from driving to manning anti-aircraft guns. They also kept the economy going, taking on jobs typically done by men. Indigenous Australians also served, fighting for a country that did not yet recognise them as citizens. The war effort changed Australia, and the nation's involvement helped shape modern Australia.
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Frequently asked questions
50,000 years ago, Australia was populated by Aboriginal people who had migrated from Africa via Southeast Asia. They developed a subsistence economy, hunting birds, fish, and animals, and harvesting edible plants. The Aboriginal population also used fire-stick farming to clear vegetation, make travel easier, and create open grasslands.
Australia was home to many unique animals, including giant kangaroos, three-ton wombat-like Diprotodons, and giant flightless birds. These creatures are known as marsupial megafauna.
Australia's climate and landscape looked similar to how they do today. Sea levels were perhaps a few meters higher, and the continent was a wide brown land of desert, grassland, and savanna.
