Scott, Richard A.; Williams, Paul L.; Craig, Lawrence C.; Barghoorn, Elso S.; Hickey, Leo J.; MacGinitie, Harry D.
(1972)
Our studies indicate a Tertiary age for silicified palm roots and wood from near Redmond, Utah, recently described as the first unequivocal angiosperms from pre-Cretaceous strata. Field relationships and petrographic ...