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I notes the use of the terms 'Tertiary' and 'Quaternary' which are
sub-eras that stratigraphers are trying not to use anymore.  The reason
being that they represent an early attempt at stratigraphic
classification which also included the 'Primary' and 'Secondary' that
are now obsolete.  Modern stratigraphers are now using the terms only
loosely.  The 'Tertiary' is now split into two periods: the Palaeogene
Period (65-23.3MYBP) and the Neogene Period (23.3-1.64MYBP).  The
'Quaternary' is now referred to as the Pleistogene Period

Neil Clark