Under construction

                       CENOZOIC ERA EXPANDED

Cenozoic era extends from 65 m.y.a. to present and it is divided into 
Tertiary and Quaternary periods:
millions
of years
ago
era period epoch
        |
     65 +  Cenozoic     Tertiary     Palaeocene         Mammals become abundant
        |      .            .            .              after extinction of
        |      .            .            .              dinosaurs and large
        |      .            .            .              reptiles; by the
        |                                               beginning of the Eocene
     60 +                                               rodents and primates
        |                                               have evolved
        |
        |
        |
     55 +
        |                            Eocene             Mammals dominant:
        |                                .              rodents, artiodactyls,
        |                                .              carnivores, perisso-
        |                                .              dactyls (including
     50 +                                               horses); whales make
        |                                               their first appearance
        |
        |
        |
     45 +
        |
        |
        |
        |
     40 +
        |
        |                            Oligocene          Continued rise of 
        |                                .              mammals:  pigs,
        |                                .              rhinoceroses, and 
     35 +                                .              tapirs make their
        |                                               appearance
        |
        |
        |
     30 +
        |
        |
        |
        |                            Miocene            More and more modern
     25 +                                .              mammals:  horses, dogs
        |                                .              and bears, modern 
        |                                .              whales, South American
        |                                               monkeys; modern birds,
        |                                               apes present in 
     20 +                                               southern Europe, 
        |                                               Ramapithecus appears
        |
        |
        |
     15 +
        |
        |
        |
        |
     10 +
        |
        |
        |                            Pliocene           Mammals similar to 
        |                                .              modern forms evolve;
      5 +                                .              australopithecines
        |                                .              appear, the forerunners
        |                                               of humanity, appear
        |               Quarternary  Pleistocene (1.8)  Ice ages; Homo-
        |                   .            .              sapiens evolves
PRESENT +                   .        Holocene (0.01)    Human history