Geologists said that significant portions of the Grand Canyon, usually considered the product of eons of erosion, may have been carved within the past million years or so (September 30, 158: 218).
(Geologists; said; that significant portions of the Grand Canyon, usually considered the product of eons of erosion, may have been carved within the past million years or so (September 30) Context(Geologists said,List([0, 15))):(significant portions of the Grand Canyon; considered; T:usually) Context(Geologists said significant portions of the Grand Canyon considered,List([0, 81))):(the product of eons of erosion; may have been carved; T:within the past million years or so)
Geologists said,List([0, 15)) Geologists said significant portions of the Grand Canyon considered,List([0, 81))
Geologists significant portions of the Grand Canyon the product of eons of erosion
said considered may have been carved
that significant portions of the Grand Canyon, usually considered the product of eons of erosion, may have been carved within the past million years or so (September 30
T:usually
T:within the past million years or so