New thermochronologic information exhibit that this segment of Grand Canyon (Marble Canyon, close Cape Solitude) was beneath several kilometers of stone strata, in addition to thus was non carved, until the final 6 meg years. This show falsifies “old canyon” hypotheses that Grand Canyon was carved inwards its same place in addition to to inside a few hundred meters of its modern depths past times fifty meg years ago. Instead, the newspaper presents a novel “paleocanyon solution” that reconciles all datasets in addition to shows that dissimilar segments of the modern Grand Canyon had dissimilar histories in addition to became linked together past times the Colorado River afterward 5-6 Ma to larn the modern Grand Canyon. Credit: Laura Crossey, UNM
Experts convey debated for nearly 150 years nigh the historic menstruation of the canyon, wrangling over how long it took for the grandiose characteristic to locomote gouged out past times the Colorado River in addition to its tributaries.
Reporting inwards the magazine Nature Geoscience, researchers inwards the United States of America of America said they had dated stone samples from the length of the 446-kilometre (277-mile) canyon in addition to used reckoner simulations of the topography inwards their novel appraisal.
Two middle sections, called the Hurricane segment in addition to the Eastern Grand Canyon segment, were formed betwixt fifty in addition to seventy meg in addition to betwixt fifteen in addition to 25 meg years agone respectively, they believe.
But ii other sections are far younger—they were carved out exclusively betwixt 5 in addition to 6 meg years ago.
Their creation linked upward all 4 segments, forming a unmarried canyon.
Today, the canyon averages nigh 1,230 metres (4,000 feet) inwards depth, falling to only about 1,850 metres (6,000 feet) at its deepest betoken in addition to 29 kilometres (18 miles) at its widest.