div class=trans-pagebutton class=gotoPage data-page=1Page 1button div class=trans-imageimg data-url=documentuniversity-of-utah-835-863-a-887-933-985-124-144-utahs-late-mesozoic-stratigraphyhtmlpage=1 data-page=1 class=trans-thumb lazyload alt=Page 1: University of Utah · 835 863 — 887 933 985 124 144 utahs late mesozoic stratigraphy vs time dinosaur extinction north horn fm kaiparowits formation select loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader033fdocumentsusreader033viewer20220424025f10da567e708231d44b212chtml5thumbnails1jpg width=140 height=200 divdiv