Great river systems moved tons of sediment from ancient eroding mountain ranges such as the Ancestral Rockies (forerunners of today's Rocky Mountains) and deposited that sediment in low-lying areas.
(Great river systems; moved; tons of sediment; from ancient eroding mountain ranges such as the Ancestral Rockies) (Great river systems; deposited; that sediment; in low-lying areas)
Great river systems Great river systems
moved deposited
tons of sediment from ancient eroding mountain ranges such as the Ancestral Rockies
that sediment in low-lying areas