Cut by the erosive force of the Colorado River to depths greater than a mile, the Grand Canyon's immense variety of formations displays an open record of geological history as far back as 2,000 million years.
(the Grand Canyon's immense variety of formations; displays; an open record of geological history; as far back as 2,000 million years)
the Grand Canyon's immense variety of formations
displays
an open record of geological history as far back as 2,000 million years