Yesterday 03:21 PM
(This post was last modified: Yesterday 03:22 PM by C C.)
https://www.zmescience.com/feature-post/...gh-pangea/
EXCERPTS: Rivers are poor archivists of their own past.
They don’t sit still like fossils, or record a single birthdate like volcanic rock. Instead, they wander across floodplains, cut into rock and often move around or even abandon their channels. A river can spend millions of years destroying the very evidence that would prove how long it’s been there.
That makes the question of the world’s oldest river surprisingly difficult. When geologists ask which river is the oldest on Earth, they’re not looking for one ancient thread of water has flowed unchanged since deep time. Rather, they’re looking for local persistence: a drainage corridor that has survived mountain-building, climate upheaval and continental rearrangement while continuing to carry water across the same broad landscape.
It really is tough work.
But geologists are hard workers, and have mapped several candidates. By that standard, the Finke River of central Australia, known to Indigenous people as Larapinta, has become the leading candidate, believed to be a whopping 400 million years old. This is over 150 million years before the dinosaurs appeared. But it’s not the only candidate.
[...] Of course, not every bend of the modern Finke is hundreds of millions of years old. Rivers wander, splice together new reaches and abandon old ones. But it suggests that a drainage system in the same broad corridor has persisted since deep Paleozoic time.
[...] The Finke’s deepest claim to age is that its history may run through the age of Pangaea itself. If parts of its drainage system began 300 million to 400 million years ago, then the river’s ancestors were already at work as the world’s landmasses were gathering into a single supercontinent, long before Australia became the isolated continent it is today, and even before the supercontinent Gondwana (whom we’ll meet in a bit) came to be... (MORE - missing details)
EXCERPTS: Rivers are poor archivists of their own past.
They don’t sit still like fossils, or record a single birthdate like volcanic rock. Instead, they wander across floodplains, cut into rock and often move around or even abandon their channels. A river can spend millions of years destroying the very evidence that would prove how long it’s been there.
That makes the question of the world’s oldest river surprisingly difficult. When geologists ask which river is the oldest on Earth, they’re not looking for one ancient thread of water has flowed unchanged since deep time. Rather, they’re looking for local persistence: a drainage corridor that has survived mountain-building, climate upheaval and continental rearrangement while continuing to carry water across the same broad landscape.
It really is tough work.
But geologists are hard workers, and have mapped several candidates. By that standard, the Finke River of central Australia, known to Indigenous people as Larapinta, has become the leading candidate, believed to be a whopping 400 million years old. This is over 150 million years before the dinosaurs appeared. But it’s not the only candidate.
[...] Of course, not every bend of the modern Finke is hundreds of millions of years old. Rivers wander, splice together new reaches and abandon old ones. But it suggests that a drainage system in the same broad corridor has persisted since deep Paleozoic time.
[...] The Finke’s deepest claim to age is that its history may run through the age of Pangaea itself. If parts of its drainage system began 300 million to 400 million years ago, then the river’s ancestors were already at work as the world’s landmasses were gathering into a single supercontinent, long before Australia became the isolated continent it is today, and even before the supercontinent Gondwana (whom we’ll meet in a bit) came to be... (MORE - missing details)