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61:0.1 The era of [[mammals]] extends from the times of the [[origin]] of [http://en.wikipedia.org/wiki/Placenta placental] mammals to the end of the [http://en.wikipedia.org/wiki/Ice_Age ice age], covering a little less than fifty million years.
 
61:0.1 The era of [[mammals]] extends from the times of the [[origin]] of [http://en.wikipedia.org/wiki/Placenta placental] mammals to the end of the [http://en.wikipedia.org/wiki/Ice_Age ice age], covering a little less than fifty million years.
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61:0.2 During this [http://en.wikipedia.org/wiki/Cenozoic 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 http://en.wikipedia.org/wiki/Panama_isthmus Panama Isthmus] went up and down; three times [http://en.wikipedia.org/wiki/Bering_Strait Bering Strait] land bridge did the same. The [[animal]] [[types]] were both many and varied. The trees swarmed with [http://en.wikipedia.org/wiki/Birds birds], and the whole world was an [[animal]] [[paradise]], notwithstanding the incessant [[struggle]] of the evolving animal [[species]] for supremacy.
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61:0.2 During this [http://en.wikipedia.org/wiki/Cenozoic 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 [http://en.wikipedia.org/wiki/Panama_isthmus Panama Isthmus] went up and down; three times [http://en.wikipedia.org/wiki/Bering_Strait Bering Strait] land bridge did the same. The [[animal]] [[types]] were both many and varied. The trees swarmed with [http://en.wikipedia.org/wiki/Birds birds], and the whole world was an [[animal]] [[paradise]], notwithstanding the incessant [[struggle]] of the evolving animal [[species]] for supremacy.
    
61:0.3 The 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.
 
61:0.3 The 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.

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