The scientists analysing the rocks are now confident that the formation of the ice sheets began between 33 and 34 million years ago - year zero for the frozen continent.
(The scientists; analysing; the rocks) (The scientists analysing the rocks; are; T:now; confident that the formation of the ice sheets began between 33 and 34 million years ago - year zero for the frozen continent) (the formation of the ice sheets; began; T:between; T:33 and 34 million years ago)
The scientists The scientists analysing the rocks the formation of the ice sheets
analysing are began
the rocks
T:now confident that the formation of the ice sheets began between 33 and 34 million years ago - year zero for the frozen continent
T:between T:33 and 34 million years ago