The scientists determined that although the rock was deposited about three billion years ago, it holds ancient mineral grains - zircons - that were much older.
(the rock; was deposited; T:about three billion years ago) (ancient mineral grains - zircons; were; much older) (The scientists; determined; that although the rock was deposited about three billion years ago, it holds ancient mineral grains - zircons) Context(The scientists determined,List([0, 25))):(it; holds; ancient mineral grains - zircons - that were much older)
The scientists determined,List([0, 25))
the rock ancient mineral grains - zircons The scientists it
was deposited were determined holds
T:about three billion years ago
much older
that although the rock was deposited about three billion years ago, it holds ancient mineral grains - zircons
ancient mineral grains - zircons - that were much older