The Mammalian Era on Urantia

61:0.1The era of mam­mals ex­tends from the times of the ori­gin of pla­cen­tal mam­mals to the end of the ice age, cov­er­ing a lit­tle less than fifty mil­lion years.

61:0.2Dur­ing this Ceno­zoic age the world’s land­scape pre­sented an at­trac­tive ap­pear­ance—rolling hills, broad val­leys, wide rivers, and great forests. Twice dur­ing this sec­tor of time the Panama isth­mus went up and down; three times the Bering Strait land bridge did the same. The an­i­mal types were both many and var­ied. The trees swarmed with birds, and the whole world was an an­i­mal par­a­dise, not­with­stand­ing the in­ces­sant strug­gle of the evolv­ing an­i­mal species for su­prem­acy.

61:0.3The ac­cu­mu­lated de­posits of the five pe­ri­ods of this fifty-mil­lion-year era con­tain the fos­sil rec­ords of the suc­ces­sive mam­malian dy­nas­ties and lead right up through the times of the ac­tual ap­pear­ance of man him­self.