We know that if a fossil once lived on Earth 260 million years ago, the layer that it was fossilized in must be at least 260 million years old.
(a fossil; lived; L:on Earth; T:260 million years ago; T:once) (it; was fossilized; L:in) (We; know; that if a fossil once lived on Earth 260 million years ago, the layer that it was fossilized in must be at least 260 million years old) Context(We know,List([0, 7))):(the layer that it was fossilized in; must be; at least 260 million years old)
We know,List([0, 7))
a fossil it We the layer that it was fossilized in
lived was fossilized know must be
L:on Earth T:260 million years ago T:once
L:in
that if a fossil once lived on Earth 260 million years ago, the layer that it was fossilized in must be at least 260 million years old
at least 260 million years old