Where Would You Place the Actual Extinction Date of a Taxon

Multiple Choice

Where would you place the actual extinction date of a taxon if you knew that the Signor-Lipps effect was at work?

A) exactly at the date of the last-known fossil
B) after the date of the last-known fossil
C) before the date of the last-known fossil
D) It is not possible to determine when extinction occurred relative to the date of the last-known fossil.