IT IS AN AGE OF HOMININS -THE AGE WHICH MARKS THE BEGINNING OF THE OLD STONE AGE OF OUR PREHISTORY.OUR TRIBE /'RACE ' HAD BEGUN IN LATE MIOCENE BUT IT BECAME CLEARLY RECOGNISABLE IN PLIOCENE AND ARDI OR LUCY -COMMON MOTHER OF ALL HUMANS LIVED IN IT THIS EPOCH WAS MARKED BY GREAT AMERICAN EXCHANGE DUE TO FORMATION OF PANAMA BRIDGE IT IS ALSO KNOWN FOR MAMMOTHS IN NORTHERN AND TERROR BIRDS AND MARSUPIALS IN SOUTHERN HEMISPHERE .IT WAS ALSO AN AGE OF DECIDUOUS FORESTS SAVANNAS AND GRASSLANDS AND CONTINUED DOMINATION OF ANGISPERMS AND MAMMALS