Αποτελέσματα Αναζήτησης
The Grand Canyon tells one of the world’s greatest geologic stories. Its distinctive features allow researchers to piece together the history of this unique location, one of America’s treasures and a UNESCO World Heritage Site.
The geology of the Grand Canyon area includes one of the most complete and studied sequences of rock on Earth. The nearly 40 major sedimentary rock layers exposed in the Grand Canyon and in the Grand Canyon National Park area range in age from about 200 million to nearly 2 billion years old.
1 Οκτ 2024 · The story begins almost two billion years ago with the formation of the igneous and metamorphic rocks of the inner gorge. Above these old rocks lie layer upon layer of sedimentary rock, each telling a unique part of the environmental history of the Grand Canyon region.
5 ημέρες πριν · Briefly summarized, the geologic history of the canyon strata is as follows. The crystallized, twisted, and contorted unstratified rocks of the inner gorge at the bottom of the canyon are Archean granite and schist more than 2.5 billion years old.
2 Δεκ 2009 · The Grand Canyon is a mile-deep gorge in northern Arizona. Scientists estimate the canyon may have formed 5 to 6 million years ago when the Colorado River began to cut a channel...
11 Φεβ 2019 · The Grand Canyon in northern Arizona is America’s greatest geologic wonder. Shaped by erosion of the Colorado River and its tributaries, the Canyon offers a landscape of grand-in-themselves side canyons, buttes, mesas and plateaus, with an unprecedented window into 2 billion years of Earth history.
However, the Grand Canyon has been an especially important place for the study of geology. Considered one of the seven natural wonders of the world, and the planet’s foremost example of canyon-cutting erosion, geologists over the past century have worked hard to unravel its mysteries.
