Yamhill Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Paleogene
 ....Eocene
 .....Yamhill Formation
RTOregon
SNComprises Mill Creek Beds, of predominantly dark-gray shale and siltstone with occasional beds of lime-cemented sandstone, and an overlying sequence of massive sandstone beds which grades upward into more argillaceous rock. In W Oregon.