Approximately 60 million years ago, a tectonic plate collision called the Laramide Orogeny created the Rocky Mountains.
(a tectonic plate collision; called; the Laramide Orogeny) (a tectonic plate collision called the Laramide Orogeny; created; the Rocky Mountains; T:Approximately 60 million years ago)
a tectonic plate collision a tectonic plate collision called the Laramide Orogeny
called created
the Laramide Orogeny
the Rocky Mountains T:Approximately 60 million years ago