We had to keep in mind that the large-scale erosion of the Grand Canyon could only take place because the Colorado Plateau has been up- lifted over the last nine million years and thus formed an obstacle to the river running through this area (Meynen 1985, 262).
(the river; running; ) (We; to keep; in mind; that the large-scale erosion of the Grand Canyon could only take place) Context(We to keep,List([0, 14))):(the large-scale erosion of the Grand Canyon; could only take; place; because the Colorado Plateau has been up- lifted over the last nine million years and thus formed an obstacle to the river) (the Colorado Plateau; has been; up- lifted over the last nine million years) (the Colorado Plateau; formed; an obstacle to the river)
We to keep,List([0, 14))
the river We the large-scale erosion of the Grand Canyon the Colorado Plateau the Colorado Plateau
running to keep could only take has been formed
in mind that the large-scale erosion of the Grand Canyon could only take place
place because the Colorado Plateau has been up- lifted over the last nine million years and thus formed an obstacle to the river
up- lifted over the last nine million years
an obstacle to the river