North Dakota's Badlands About 60 million years ago, streams carried eroded materials eastward from the young Rocky Mountains and deposited them on a vast lowland, today's Great Plains.
(streams; carried eastward; from the young Rocky Mountains; T:About 60 million years ago) (streams; deposited; them; on a vast lowland; T:About 60 million years ago)
streams streams
carried eastward deposited
from the young Rocky Mountains T:About 60 million years ago
them on a vast lowland T:About 60 million years ago