Among the dominant lifeforms that flourished in this epoch were the marine foraminiferans - protozoans similar to amoebas but bearing a complex, often calcareous test - as well as the largest land mammal of all time, the Baluchitherium.  
Among the dominant lifeforms that flourished in this epoch were the marine foraminiferans - protozoans similar to amoebas but bearing a complex, often calcareous test - as well as the largest land mammal of all time, the Baluchitherium.  Divided into two ages, the Rupelian and the Chattian, its other noteworthy developments include the evolution of the first mastodon and the earliest apelike form, the Parapithecus, but otherwise "few recent forms" came into being, hence its name.  FTP, name this epoch of the Tertiary period that lasted from 36.6 to 23.7 million years ago, following the Eocene  and preceding the Miocene.
Among the dominant lifeforms that flourished in this epoch were the marine foraminiferans - protozoans similar to amoebas but bearing a complex, often calcareous test - as well as the largest land mammal of all time, the Baluchitherium.  
Oligocene epoch