Roymond Posted June 4, 2023 Group: Senior Member Followers: 0 Topic Count: 5 Topics Per Day: 0.01 Content Count: 782 Content Per Day: 1.59 Reputation: 238 Days Won: 1 Joined: 12/15/2022 Status: Offline Share Posted June 4, 2023 On 1/20/2018 at 11:22 AM, Quasar93 said: Researchers suggest that the canyon could have been formed by a river that was frequented by the massive dinosaurs of the late Cretaceous period. The research, published in the journal Science, adds a new component to 150 years of wrangling over the exact age of the mile-deep canyon in Arizona, according to University of Colorado Assistant Professor Rebecca Flowers. A new method of measuring radioactive decay from minerals in the soil suggests the gorge is 70 million years old. Flowers, who worked with Professor Kenneth Farley of the California Institute of Technology one of the project, said in a telephone interview. The team examined soil samples from both the western and eastern parts of the canyon, and their findings confirmed a similar study published last year based on a study of just one side of the canyon. It suggests that the canyon would have been carved by a river that existed before dinosaurs became extinct 65 million years ago and before the existence of the modern Colorado River system, a 1,450-mile-long (2,333-km-long) body of water that flows from Colorado to Mexico. "At that time, the topography of the landscape in the Western U.S. looked very, very different than today," she said. In fact, the elevation of the land in the West was higher and that ancient river would have flowed in the opposite direction of the Colorado River, she said. Source: http://news.msn.com/science-technology/ ... -dinosaurs Quasar 93 Wait a minute -- it flowed the opposite direction? That's intriguing! Link to comment Share on other sites More sharing options...
Roymond Posted June 4, 2023 Group: Senior Member Followers: 0 Topic Count: 5 Topics Per Day: 0.01 Content Count: 782 Content Per Day: 1.59 Reputation: 238 Days Won: 1 Joined: 12/15/2022 Status: Offline Share Posted June 4, 2023 On 2/23/2019 at 7:10 AM, Who me said: Yet it is pure speculation to say that a meandering river has cut through nearly a mile of solid rock. This is not seen anywhere in the world as happening today. Actually there are rivers cutting that fast; it doesn't really take much. The only unusual thing about the Grand Canyon is that the land above it is so roughly level; most rivers that cut fast are in very rough territory, e.g. the Himalayas. Makes me wish I'd taken the next hydrology course in the geology sequence. Link to comment Share on other sites More sharing options...
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