Geology: “The water flowed across the plateau” – How the Grand Canyon actually got here into being | EUROtoday

According to an evaluation, the overflow of a primeval lake might have been the decisive foundation for the creation of the Grand Canyon. New information helps this so-called overflow speculation, a analysis staff studies within the journal Science. The Grand Canyon, by means of which the Colorado River flows, stretches for round 450 kilometers within the north of the US state of Arizona, is as much as 29 kilometers extensive and reaches a depth of round 1,600 meters.

According to geological evaluation, the Colorado River existed in what’s now western Colorado about eleven million years in the past. However, it solely took its present path by means of the area round 5.6 million years in the past, as researchers led by John He from the University of California in Los Angeles report. According to the brand new information, the decisive issue was the overflow of a big primeval lake.

He’s staff used uranium-lead relationship of zircon crystals from volcanic ash layers and sandstone to find out the age and origin of sediments alongside the Colorado River. The information suggests a standard sediment supply and means that the Bidahochi Formation east of the canyon was most likely linked to the unique Colorado River 6.6 million years in the past.

Combined with different geological proof, scientists conclude that the river’s water flowed into the previous basin and progressively stuffed it over a whole bunch of 1000’s to greater than one million years. Lake Bidahochi rose so excessive that it overflowed the Kaibab Plateau and minimize into it. The water flowed additional throughout the plateau into the canyon area and created a river with a really steep gradient that minimize deeper and deeper into the rock.

The energy of water could be seen in lots of areas of the world. The Mediterranean, for instance, as soon as largely dried up as a result of it was minimize off from the Atlantic. Even at present, a kilometer-thick layer of salt below the ocean bears witness to the state of affairs 5.5 million years in the past: round one million cubic kilometers of salt amassed, as a analysis staff reported in “Science” in 2024.

The strongest waterfall within the historical past of the earth

In his guide “Primitive Worlds,” paleontologist Thomas Halliday described how researchers think about the occasions to happen. In the Mediterranean, islands grew to become mountains because the water receded, it says. Valleys 4 kilometers beneath sea degree have been created – the bottom mendacity nation on the earth.

The water from the Atlantic then initially shot again into the western basin. Later, the japanese half additionally stuffed up – probably by way of the “most powerful waterfall the earth has ever seen”. The guide says it was most likely 1,500 meters excessive. The water might have shot over the steep slope at a velocity of virtually 250 kilometers per hour and largely become mist earlier than it reached the underside.

“Despite this continued deluge, which is lifting the eastern Mediterranean by a meter every two and a half hours, it will take more than a year to fill the eastern Mediterranean, until Malta, Gozo and Sicily are finally cut off from Africa and Italy and Gargano becomes an island again,” the guide says.

Even at present there’s nonetheless just one passage from the Atlantic to the Mediterranean: the Strait of Gibraltar. The channel, which is only some kilometers extensive, permits contemporary water to move from the Atlantic into the saltier Mediterranean.