How to identify the SQL being rolled back?

I have a huge transaction rolling back in a 9.2.0.6 database and am curious what it was. From my calculations based on v$transaction.used_ublk, it looks like it is going to take 4 hours to complete the rollback. All I see in v$sql.sql_text is "ROLLBACK". Any idea where/how I can find more detail about what is being rolled back - either the SQL statement(s), or the affected objects?  

Thanks,
Brandon

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