A Long TimeSeries teasers are where you try to complete the sequence of a series of letters, numbers or objects.
Which 2 letters come next in this series?
C, O, S, D, C, P, T, J, C, _, _
AnswerT & Q
These are the initials of the periods from Cambrian (100,000,000 yrs ago) to Quaternary (present):
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