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Age of Oligocene (post-KT, sorry)

Can someone help me here? What is the best estimate of the beginning of the Oligocene period? I have found timelines stating anywhere from 38 to 34 mya. In fact, what is the most accurate and well-documented timeline available (on the internet, by choice)? Thanks?

Ronald I. Orenstein Phone: (905) 820-7886
International Wildlife Coalition Fax/Modem: (905) 569-0116
1825 Shady Creek Court
Mississauga, Ontario, Canada L5L 3W2 mailto:ornstn@rogers.com