The Morrison Formation was deposited approximately 155-145 million years ago and covers a large area of the western US, from Montana to Arizona and Utah to Colorado.
(The Morrison Formation; was deposited; T:approximately 155-145 million years ago) (The Morrison Formation; covers; a large area of the western US, from Montana to Arizona and Utah to Colorado)
The Morrison Formation The Morrison Formation
was deposited covers
T:approximately 155-145 million years ago
a large area of the western US, from Montana to Arizona and Utah to Colorado