アメリカ内務省さんのインスタグラム写真 - (アメリカ内務省Instagram)「Canyonlands National Park in #Utah is a showcase of #geology. In each of the park's districts, visitors can see the remarkable effects of time and erosion on a landscape of sedimentary rock. For millions of years, rock was broken down and carried here by wind and water, creating deposits that eventually became distinct rock layers. Many of the rock's layers were deposited near sea level, but after a long period of uplift, the average elevation is now over 5,000 feet above sea level. As this area gradually rose, rivers that once deposited sediment on the lowlands began to remove it from the emerging plateau. The Green and Colorado rivers carved into the geologic layer cake, exposing buried sediments and creating the canyons and rock spires of Canyonlands that amaze us now. Photo by Randy Smythe (www.sharetheexperience.org). #ICYMI We're looking back on your favorite posts of 2020. This display of incredible geologic formations really rocked our feeds this year. #Top10of2020 #usinterior」12月28日 2時23分