呵呵~~答案就在" Granite, found on the Pumpkin Buttes, is evidence that the early Rockies dumped their eroded rock into the basins. Wind River Canyon, cutting straight through the Owl Creek Mountains is evidence that the Rockies were buried by their own debris." 看看在文中哪里？仅供参考！

来源:可可英语 http://www.kekenet.com/Article/201111/161957.shtml