div class=trans-pagebutton class=gotoPage data-page=1Page 1button div class=trans-imageimg data-url=documentdonald-miocene-arikareean-land-mammal-age-in-north-america-hashtmlpage=1 data-page=1 class=trans-thumb lazyload alt=Page 1: Donald Prothero · Miocene Arikareean land mammal age in North America has become mostly late Oligocene For years mammalian biostratigraphers had identi- fled the Eocene-Oligocene loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader033fdocumentsnetreader033viewer20220504155f8baf15b17916423e1496a1html5thumbnails1jpg width=140 height=200 divdivdiv class=trans-pagebutton class=gotoPage data-page=2Page 2button div class=trans-imageimg data-url=documentdonald-miocene-arikareean-land-mammal-age-in-north-america-hashtmlpage=2 data-page=2 class=trans-thumb lazyload alt=Page 2: Donald Prothero · Miocene Arikareean land mammal age in North America has become mostly late Oligocene For years mammalian biostratigraphers had identi- fled the Eocene-Oligocene loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader033fdocumentsnetreader033viewer20220504155f8baf15b17916423e1496a1html5thumbnails2jpg width=140 height=200 divdivdiv class=trans-pagebutton class=gotoPage data-page=3Page 3button div class=trans-imageimg data-url=documentdonald-miocene-arikareean-land-mammal-age-in-north-america-hashtmlpage=3 data-page=3 class=trans-thumb lazyload alt=Page 3: Donald Prothero · Miocene Arikareean land mammal age in North America has become mostly late Oligocene For years mammalian biostratigraphers had identi- fled the Eocene-Oligocene loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader033fdocumentsnetreader033viewer20220504155f8baf15b17916423e1496a1html5thumbnails3jpg...