The scientists examined the one-inch clay layer because it is a well-studied sediment that contains extraterrestrial iridium and highly shocked minerals resulting from an asteroid impact 65 million years ago.
(The scientists; examined; the one-inch clay layer; because it is a well-studied sediment) (it; is; a well-studied sediment that contains extraterrestrial iridium and highly shocked minerals) (a well-studied sediment; contains; extraterrestrial iridium) (minerals; resulting; from an asteroid impact 65 million years ago)
The scientists it a well-studied sediment minerals
examined is contains resulting
the one-inch clay layer because it is a well-studied sediment
a well-studied sediment that contains extraterrestrial iridium and highly shocked minerals
extraterrestrial iridium
from an asteroid impact 65 million years ago