id	keyword
giw-68	drf
giw-68	river formation
giw-68	duchesne river
giw-68	tuffs
giw-68	formation tuffs
giw-68	utah
giw-68	ages
giw-68	volcanic
giw-68	biotite
giw-68	compositions
giw-68	c drf
giw-68	h drf
giw-68	eocene
giw-68	geology
giw-68	christiansen
giw-68	figure
giw-68	kowallis
giw-68	member
giw-68	nevada
giw-68	lapoint
giw-68	geological
giw-68	sprinkel
giw-68	source
giw-68	sample drf
giw-68	basin
giw-68	eocene duchesne
giw-68	grains
giw-68	ash
giw-68	e.h
giw-68	allanite
giw-68	d.a
giw-68	uinta
giw-68	fallout
giw-68	creek
giw-68	webb