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Footprints Found in Australia Challenge Old Theories and Predict the Origin of Reptiles 35 Million Years Ago, Suggesting That the First Modern Tetrapods May Have Emerged in the Southern Hemisphere.
The origin of reptiles has always been told based on fossils found in the Northern Hemisphere. But a new discovery in Australia completely changes that narrative.
Scientists found fossilized footprints much older than previously thought, and now propose that the first reptiles may have emerged in the supercontinent Gondwana, millions of years earlier than believed.
These marks on the ground challenge everything known about the timeline of tetrapod evolution – a group that includes amphibians, reptiles, birds, and mammals, such as humans. And more than that: they indicate that science was looking in the wrong place.
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The Arrival of the First Feet on Land
Tetrapods emerged during the Devonian period, about 390 million years ago. They were fish with robust fins that began to drag themselves out of the water.
From this ancestral lineage, two major groups formed.
One gave rise to modern amphibians, such as frogs and salamanders. The other group evolved into the so-called amniotes, animals with eggs protected by special membranes. Among the amniotes are all reptiles, birds, and mammals.
Today, amniotes dominate all terrestrial environments. They are on the ground, in the air, and even successfully returned to the oceans.
But the beginning of this journey remains a great mystery.
Until now, it was believed that the first amniotes emerged around 318 million years ago, based on fossils found in North America and Europe.
The Fossil That Changed Everything
The new discovery was made in the Taungurung region, near the town of Mansfield, in southeastern Australia.
A sandstone slab measuring 35 centimeters wide brought a surprise: well-preserved footprints with claw marks.
The scientists who analyzed the material affirm that these are footprints of primitive amniotes — likely reptiles.
This simple slab of stone may mean that the first reptiles existed at least 35 million years earlier than previously thought.
The footprints were dated between 359 and 350 million years ago, that is, at the beginning of the Carboniferous period.
The marks were left by animals with toes and claws — a unique characteristic of amniotes. Amphibians, for example, rarely have true claws.
Therefore, the presence of these sharp marks is a strong indication of the type of animal that passed by.
Footprints in the Rain
The footprints were found in an area known for containing fossils of fish that lived in rivers and lakes. But this time, what caught attention was what happened outside the water.
The footprints appear alongside small marks from raindrops, which proves that the animals walked on land shortly after a precipitation.
The scene is recorded as if it were a photograph from the past: footprints crossing the surface of the stone, one overlapping the other, all with scratches left by the claws.
The animals seemed to move with certainty, leaving their marks on wet ground.
The shape of the footprints is similar to that of known primitive reptiles. Thus, scientists are confident in claiming that these are amniotes, pushing back the origin of this group even further.
A New Beginning
If amniotes already existed between 359 and 350 million years ago, the separation between them and amphibians must have occurred even earlier — perhaps at the end of the Devonian, around 380 million years ago. This completely changes what has been known until now.
The problem is that the fossil record does not align with this new timeline. Until now, almost all important fossils have come from Euramerica — an ancient continent in the Northern Hemisphere, where present-day North America and Europe are located.
On the other hand, Gondwana, the ancient southern supercontinent that included Australia, Africa, South America, Antarctica, and India, has always been a mystery during this period of history.
There are very few tetrapod fossils found there. And because of this, many ancient species may have simply gone unnoticed.
Just the Beginning of Discoveries?
The slab found in southeastern Australia is, to date, the only tetrapod fossil from the early phase of the Carboniferous period in all of Gondwana.
The fossil record of the Devonian is also scarce in this part of the planet. This suggests that scientists still know very little about the animals that lived in these regions in the remote past.
This scarcity raises an important question: did the first modern tetrapods emerge in the southern lands and only later migrate to other regions of the world? It is a possible hypothesis, but one that still needs more evidence.
Researchers point out that the only way to answer this question is to continue digging. Only new field discoveries in other areas of Gondwana can fill the gaps left by the lack of fossils.
A Discovery with Global Impact
The discovery of the Australian footprints is considered one of the most important in recent years for paleontology.
It not only anticipates the origin of reptiles by millions of years but also suggests that the first chapters of tetrapod evolution may have occurred far from the locations where scientists have always searched.
Science now has a new starting point to rethink the history of life on Earth. If Gondwana was indeed the cradle of modern tetrapod groups, there is still much to be revealed under the soil of regions like Australia, Africa, and South America.
The finding in Mansfield shows that it is possible to find revolutionary evidence even in small fragments of rock.
The footprints left by animals that lived more than 350 million years ago opened a new line of scientific investigation.
From now on, the eyes of paleontology turn to the southern hemisphere, in hopes that new clues will emerge.
After all, the history of life on Earth is written in its deepest layers. And only those who dig patiently can read it completely.
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